Borg BL5151SC Mechanical Digital Lock - Knob and Lever Keypad Back-to-Back - Satin Chrome
At A Glance
At A Glance
DISPATCHSame Day Before 11am
PIN Code (Both Sides)The Borg BL5151SC is a fully mechanical digital lock in a knob and lever back-to-back configuration: a knob keypad on one face of the door and a lever keypad on the other, each with its own independent coding chamber, driving a 60mm tubular latch. A code is required to pass through in either direction - with a different code on each side if wanted.
The knob keeps a lower profile on the door face; the lever is easier to grip. Borg makes the BL5000 series - the 5100 is its knob keypad - for medium to heavy duty doors and cycle tests it to 100,000 operations. The code is changed On The Bench, with over 2,000 combinations per side, so this lock suits doors where the code rarely changes. The satin chrome finish is for internal doors.
Because a code is needed to get out, it is not for fire doors, emergency exit or fire egress doors - for a free inside exit, see the single-sided knob keypad BL5101. Being entirely mechanical, it needs no batteries, wiring or power at any point. Browse the full battery-free range in our Digital Mechanical Locks category.
Estimated Dispatch
Usually ships same day if ordered before 11am AEST (excludes weekends and Queensland public holidays).
Usually ships same day if ordered before 11am AEST (excludes weekends and Queensland public holidays).
Knob Keypad One Side, Lever Keypad the Other
The BL5151SC puts a knob keypad on one face of the door and a lever keypad on the other, and a code is entered on whichever side you are standing. On the knob side, enter the code and turn the knob; on the lever side, enter the code and push the lever down. The knob keeps a lower profile, which suits a corridor face or a tight space; the lever is easier to grip, so put it on the side used most, or by anyone who finds a knob hard to turn. More on what a double-sided lock is.
The BL5151SC puts a knob keypad on one face of the door and a lever keypad on the other, and a code is entered on whichever side you are standing. On the knob side, enter the code and turn the knob; on the lever side, enter the code and push the lever down. The knob keeps a lower profile, which suits a corridor face or a tight space; the lever is easier to grip, so put it on the side used most, or by anyone who finds a knob hard to turn. More on what a double-sided lock is.
Not for Fire Doors, Emergency Exit or Fire Egress Doors
This back-to-back lock needs a code to get out: keypads sit on both faces, and neither the knob nor the lever will withdraw the latch until the correct PIN is entered on that side. It is not for fire doors, and not for emergency exit or fire egress doors; see exit paths on double-sided locks. If free inside egress is required, choose a single-sided lock: the knob keypad BL5101, whose inside knob always turns, or the lever Borg BL5001, which is also fire tested to AS 1905.1-2005 for fire doors.
This back-to-back lock needs a code to get out: keypads sit on both faces, and neither the knob nor the lever will withdraw the latch until the correct PIN is entered on that side. It is not for fire doors, and not for emergency exit or fire egress doors; see exit paths on double-sided locks. If free inside egress is required, choose a single-sided lock: the knob keypad BL5101, whose inside knob always turns, or the lever Borg BL5001, which is also fire tested to AS 1905.1-2005 for fire doors.
Code Change Requires Keypad Removal - On The Bench
This is a non-ECP model: changing a PIN means taking that side's keypad off the door and working On The Bench. Remove the 4 red screws, lift the cover panel carefully (springs are attached), hold C down throughout, then reposition the red (coded) and blue (uncoded) code pieces with the supplied tweezers - square cut-outs facing outward, coloured marks facing upward. The knob side and the lever side are changed independently, with over 2,000 combinations per side. It is a fiddly job the first time - read the bench method step by step and the traps to avoid before starting, and Borg's own steps are in the BL5000 Series Non-ECP Manual (PDF). If codes will change often, an Easicode Pro back-to-back changes on the door - the lever/lever BL5051MGECP.
This is a non-ECP model: changing a PIN means taking that side's keypad off the door and working On The Bench. Remove the 4 red screws, lift the cover panel carefully (springs are attached), hold C down throughout, then reposition the red (coded) and blue (uncoded) code pieces with the supplied tweezers - square cut-outs facing outward, coloured marks facing upward. The knob side and the lever side are changed independently, with over 2,000 combinations per side. It is a fiddly job the first time - read the bench method step by step and the traps to avoid before starting, and Borg's own steps are in the BL5000 Series Non-ECP Manual (PDF). If codes will change often, an Easicode Pro back-to-back changes on the door - the lever/lever BL5051MGECP.
Independent Coding Chambers - Different Codes Each Side
Each keypad has its own mechanical coding chamber. Both sides can share one code, or each side can run a different code - a shared entry code with a staff-only exit code, for example. The two codes sit behind different handles, so a knob-side code and a lever-side code are easy to keep apart.
Each keypad has its own mechanical coding chamber. Both sides can share one code, or each side can run a different code - a shared entry code with a staff-only exit code, for example. The two codes sit behind different handles, so a knob-side code and a lever-side code are easy to keep apart.
Free Passage - the F Button, Per Side
Either side can be set to free passage during business hours: enter that side's code and press F before you turn the knob or push the lever down - that handle then stays free and withdraws the latch without a code until you cancel it. To cancel, press F then C. Free passage on one side leaves the other side coded. If free passage should never be available on a side, the F piece can be taken out of that side's coding chamber On The Bench (the BLSFTUMBLER puts it back). More on passage mode vs holdback mode.
Either side can be set to free passage during business hours: enter that side's code and press F before you turn the knob or push the lever down - that handle then stays free and withdraws the latch without a code until you cancel it. To cancel, press F then C. Free passage on one side leaves the other side coded. If free passage should never be available on a side, the F piece can be taken out of that side's coding chamber On The Bench (the BLSFTUMBLER puts it back). More on passage mode vs holdback mode.
Fully Mechanical - No Batteries Required
Entirely mechanical - no power source, no wiring, no batteries to go flat. Weighing this against an app-connected lock? See mechanical digital vs smart locks and Buyer's Guide Chapter 16.
Entirely mechanical - no power source, no wiring, no batteries to go flat. Weighing this against an app-connected lock? See mechanical digital vs smart locks and Buyer's Guide Chapter 16.
Designed for medium to heavy usage areas
Offices, meeting rooms, server rooms, storerooms and staff-only doors where both-sided code control is the requirement. Borg makes the BL5000 series - the 5100 is its knob keypad - for medium to heavy duty doors, with a strengthened clutch and coding chamber, and cycle tests it to 100,000 operations.
Offices, meeting rooms, server rooms, storerooms and staff-only doors where both-sided code control is the requirement. Borg makes the BL5000 series - the 5100 is its knob keypad - for medium to heavy duty doors, with a strengthened clutch and coding chamber, and cycle tests it to 100,000 operations.
Not recommended for extremely high traffic without a servicing schedule
For relentless commercial traffic, step up to the Lockwood 3572DX, Borg BL7701, or Carbine CDL7200LL-HD - see what heavy duty actually means.
For relentless commercial traffic, step up to the Lockwood 3572DX, Borg BL7701, or Carbine CDL7200LL-HD - see what heavy duty actually means.
Single PIN Code Per Keypad
Each keypad holds one active PIN code at a time (the two sides can differ). No multi-user code list and no audit trail - the honest limitation of every mechanical digital lock; see what these locks will not do.
Each keypad holds one active PIN code at a time (the two sides can differ). No multi-user code list and no audit trail - the honest limitation of every mechanical digital lock; see what these locks will not do.
Access Methods
This is a mechanical digital lock with a keypad on both faces - a knob keypad on one and a lever keypad on the other: the correct code opens the door from either side, and there is no free inside handle. There is no key override, app, fob or card on this model - for keyed entry on a back-to-back, see the BL5771MGPROECP in the range table below.
Key Features
- Knob keypad on one face, lever keypad on the other - a code is required from both sides; no free inside egress.
- Independent coding chambers - a different code can be set on each side.
- Free passage function (F button) per side - hold either side open during business hours.
- Clutching knob and lever - each spins freely without a valid code, so it cannot be forced against the latch.
- Medium to heavy duty BL5000 series (the 5100 is its knob keypad) - strengthened clutch and coding chamber, cycle tested to 100,000 operations (Borg BL5000 Series Brochure).
- On The Bench code change - over 2,000 combinations per side (Borg BL5000 Series Brochure); code length 3 to 7 digits; digits entered in any order.
- Not for fire doors, emergency exit or fire egress doors - a code is required to exit from inside.
- Fully mechanical - no batteries, no wiring, no power source.
- 60mm heavy duty anti-thrust tubular latch; a 70mm latch is available separately.
- 8mm spindle - 80mm and 90mm spindles supplied.
- Door thickness 35mm to 54mm on the standard fixings.
- Satin chrome finish - for internal doors.
- Reversible on site for left or right hand doors - no handed ordering.
What's in the Box
- Borg BL5151SC knob keypad assembly (satin chrome)
- Borg BL5151SC lever keypad assembly (satin chrome)
- 60mm heavy duty anti-thrust tubular latch
- Strike plate and box keep
- 2 x spindles (80mm and 90mm)
- 4 x 16mm screws
- 2 x M4 x 40mm screws
- 2 x M4 x 50mm screws
- 2 x M4 x 60mm screws
- 2 x coded code pieces (red - spare)
- 2 x non-coded code pieces (blue - spare)
- Tweezers (for the On The Bench code change)
- Long hex wrench (Allen key)
- 2 x handle screw rubber grommets (one per side)
- Installation instructions
Borg BL5000 series non-ECP accessories packs - the parts supplied with the BL5151SC
A 70mm backset latch (BLL500070) is available separately. No batteries or wiring are required or supplied.
Suitable Uses
- Internal doors that need code control in both directions - offices, meeting rooms, server rooms, plant rooms and staff-only zones; browse our internal door locks.
- Doors where each side suits a different code - a shared code on the corridor side and a staff-only code on the office side, using the independent coding chambers.
- Doors where one face is tight for space - the lower-profile knob goes on that face and the lever on the side used most.
- Sites where the code rarely changes - it is changed On The Bench; if codes change often, the Easicode Pro BL5051MGECP changes on the door.
- Not for fire doors, emergency exit or fire egress doors - a code is needed to get out (see the warning above).
- Not for external, coastal or saline positions - the satin chrome finish is for internal doors.
Available Finish Options
Satin Chrome
(This Product)
BL5151SC
Internal use
The BL5151SC comes in satin chrome only, for internal use - it is not for coastal, saline or exposed external positions.
Borg Back-to-Back Range Compared
Every model below puts a keypad on both sides of the door, all fully mechanical with no batteries. The BL5151SC is the one with a knob keypad on one face; the others carry lever keypads on both. The other differences are the lock format, the key function, the code change method and the weather grade.
ECP = Easicode Pro on-door code change. MG Pro = Marine Grade Pro. Combinations are per side on every model. Need a free inside exit instead? The single-sided BL5101 is a knob keypad lock on the same platform; for knob keypads on both faces, see the BL2020SC on the BL2000 platform.
Accessories and Spare Parts
The BL5151SC shares the BL5000 series latch and coding chamber, so these parts carry over - spare parts depth is one of the reasons the range outlasts hardware store imitations.
Spare coded (red) and non-coded (blue) code pieces ship in the box; extra code pieces and knob side spares can be arranged through us - contact us. Browse all tubular latches and bolts and scar and adaptor plates.
Full Specifications
Dimensions
Both faces carry a full keypad on the same 177mm x 48mm body - the lever keypad is the BL5000 series unit and the knob keypad is the BL5100 series unit.
Lever keypad side (BL5000 series) - 177mm H x 48mm W x 26mm body depth; the drawing also marks the lever at 115mm and 89mm
Knob keypad side (BL5100 series) - 177mm H x 48mm W; 75mm deep to the knob end; 26mm door-face projection; 59mm knob
Frequently Asked Questions
Why a knob on one side and a lever on the other?
Because the two faces of a door are often used differently. The knob keeps a lower profile, so it suits a corridor face or a tight space; the lever is easier to grip, so it suits the side used most. Both faces carry a full keypad with its own coding chamber. For the same handle on both faces, see the lever/lever BL5051 or the knob/knob BL2020SC; for a free inside exit, the single-sided BL5101.
Because the two faces of a door are often used differently. The knob keeps a lower profile, so it suits a corridor face or a tight space; the lever is easier to grip, so it suits the side used most. Both faces carry a full keypad with its own coding chamber. For the same handle on both faces, see the lever/lever BL5051 or the knob/knob BL2020SC; for a free inside exit, the single-sided BL5101.
How do I change the PIN code on this model?
On The Bench. Take the relevant keypad off the door, remove the 4 red screws, carefully lift the cover panel (springs attached), hold C down, and use the supplied tweezers to reposition the red (coded) and blue (uncoded) code pieces - square cut-outs outward, coloured marks upward. The knob side and the lever side are changed independently. Test the new code at least five times before rehanging - the full procedure is at the bench method guide, and read the traps first.
On The Bench. Take the relevant keypad off the door, remove the 4 red screws, carefully lift the cover panel (springs attached), hold C down, and use the supplied tweezers to reposition the red (coded) and blue (uncoded) code pieces - square cut-outs outward, coloured marks upward. The knob side and the lever side are changed independently. Test the new code at least five times before rehanging - the full procedure is at the bench method guide, and read the traps first.
Can each side have a different code?
Yes. Each keypad has its own independent coding chamber. Both sides can share one code, or each can be set to a completely different code during the On The Bench code change - and the free passage function is engaged and released per side too. See the benefits of independent codes.
Yes. Each keypad has its own independent coding chamber. Both sides can share one code, or each can be set to a completely different code during the On The Bench code change - and the free passage function is engaged and released per side too. See the benefits of independent codes.
Can the BL5151SC go on a fire door or an exit door?
No. A back-to-back lock needs a code to get out, so it is not for fire doors, and not for emergency exit or fire egress doors. For a fire door, choose a single-sided lock with a free inside lever - the BL5001 is fire tested to AS 1905.1-2005.
No. A back-to-back lock needs a code to get out, so it is not for fire doors, and not for emergency exit or fire egress doors. For a fire door, choose a single-sided lock with a free inside lever - the BL5001 is fire tested to AS 1905.1-2005.
Can I reverse the handing on site?
Yes. Units ship factory set for right-hand doors. To change, remove the rubber grommet at the base of the handle, use the included hex wrench to remove the grub screw, rotate the handle 180 degrees and refit - on the knob keypad and on the lever keypad. Background: understanding door handing in Australia.
Yes. Units ship factory set for right-hand doors. To change, remove the rubber grommet at the base of the handle, use the included hex wrench to remove the grub screw, rotate the handle 180 degrees and refit - on the knob keypad and on the lever keypad. Background: understanding door handing in Australia.
Additional Information
Maintenance:
Monthly: wipe both keypads, the knob, the lever and the exposed latch with a light spray of silicon-based lubricant (such as GT85) and remove the excess with a soft cloth. Do not use oil-based lubricants such as WD-40 - they attract dirt and wear down internal parts over time. Annually: remove the keypads from the door, spray the inside through the code piece holes on the reverse of each keypad with silicon-based lubricant, spray all fixings, accessories and the latch with silicon-based lubricant, then press each button and operate the knob and the lever several times to confirm smooth operation. Full steps are in the Borg Lock Servicing Guide (PDF).
Monthly: wipe both keypads, the knob, the lever and the exposed latch with a light spray of silicon-based lubricant (such as GT85) and remove the excess with a soft cloth. Do not use oil-based lubricants such as WD-40 - they attract dirt and wear down internal parts over time. Annually: remove the keypads from the door, spray the inside through the code piece holes on the reverse of each keypad with silicon-based lubricant, spray all fixings, accessories and the latch with silicon-based lubricant, then press each button and operate the knob and the lever several times to confirm smooth operation. Full steps are in the Borg Lock Servicing Guide (PDF).
Not for Fire Doors:
This back-to-back lock needs a code to get out, so it is not for fire doors, emergency exit or fire egress doors. For a fire door or a door on an exit path, choose a single-sided lock with a free inside handle - the lever BL5001 is fire tested to AS 1905.1-2005. See what is actually compliant on apartment fire doors.
This back-to-back lock needs a code to get out, so it is not for fire doors, emergency exit or fire egress doors. For a fire door or a door on an exit path, choose a single-sided lock with a free inside handle - the lever BL5001 is fire tested to AS 1905.1-2005. See what is actually compliant on apartment fire doors.
Set and Test Both Codes Before Installation:
Set the knob side and test it five times, then set the lever side and test it five times - all On The Bench, before either keypad goes on the door. Know the current code before you start, and keep the door open while you test.
Set the knob side and test it five times, then set the lever side and test it five times - all On The Bench, before either keypad goes on the door. Know the current code before you start, and keep the door open while you test.
Spindle Selection:
Two spindles are supplied (80mm and 90mm). The general rule: door thickness + 30mm = minimum spindle length, because each keypad needs 15mm of spindle. Use the longest that fits and never cut a spindle shorter than necessary - a short spindle can disengage under a hard door slam, and on a back-to-back that shuts out both sides at once.
Two spindles are supplied (80mm and 90mm). The general rule: door thickness + 30mm = minimum spindle length, because each keypad needs 15mm of spindle. Use the longest that fits and never cut a spindle shorter than necessary - a short spindle can disengage under a hard door slam, and on a back-to-back that shuts out both sides at once.
Lockout Risk - No Key Override:
There is no key override and no free inside handle on either side. If the codes are forgotten with the door shut and free passage off, a locksmith is needed to get in - keep a record of both codes somewhere safe. For keyed access on a back-to-back, see the BL5771MGPROECP.
There is no key override and no free inside handle on either side. If the codes are forgotten with the door shut and free passage off, a locksmith is needed to get in - keep a record of both codes somewhere safe. For keyed access on a back-to-back, see the BL5771MGPROECP.
Warranty
Borg Locks Warranty - 12 Months (Australia)
All Borg locks are warranted against mechanical defects in materials and workmanship under normal use and service for a minimum of 12 months from date of sale. The warranty does not cover damage arising from misuse, vandalism, or improper installation. The lock must not be dismantled - doing so will invalidate the warranty. Proof of purchase required for all claims.
All Borg locks are warranted against mechanical defects in materials and workmanship under normal use and service for a minimum of 12 months from date of sale. The warranty does not cover damage arising from misuse, vandalism, or improper installation. The lock must not be dismantled - doing so will invalidate the warranty. Proof of purchase required for all claims.
Purchased through Terry's Tradies Pty Ltd or one of its associated trading names? Contact us first - we will manage your warranty claim with the Australian distributor (LSC) on your behalf. This warranty operates alongside your rights under the Australian Consumer Law.
Download PDF Resources
Borg BL5000 Series Non-ECP Manual (PDF)
Borg's five-page manual for the On The Bench BL5000 series - parts list, handing, latch fitting, the code change, the F button free passage function, troubleshooting and a drilling template. It is written around the single-sided lever models; on this back-to-back the same code change steps apply to each keypad, knob side and lever side.
Borg's five-page manual for the On The Bench BL5000 series - parts list, handing, latch fitting, the code change, the F button free passage function, troubleshooting and a drilling template. It is written around the single-sided lever models; on this back-to-back the same code change steps apply to each keypad, knob side and lever side.
Borg BL5000 Series Installation and Code Change Guide (PDF)
Borg's five-page parts list, installation, On The Bench code change and troubleshooting guide for the BL5000 round bar lever series. The code change method inside is the one used on both of this lock's keypads; its latch fitting steps are written for the lever models.
Borg's five-page parts list, installation, On The Bench code change and troubleshooting guide for the BL5000 round bar lever series. The code change method inside is the one used on both of this lock's keypads; its latch fitting steps are written for the lever models.
Borg BL5000 Series Brochure (PDF)
The BL5000 series in one page - handle styles (round bar, flat bar and knob), locking options including the back-to-back model, features (over 2,000 combinations, 100,000 cycles, free passage), finishes and dimensioned drawings of the keypads and inside handles. The 5100 is the knob handle style on it; this lock pairs it with the BL5000 series lever keypad.
The BL5000 series in one page - handle styles (round bar, flat bar and knob), locking options including the back-to-back model, features (over 2,000 combinations, 100,000 cycles, free passage), finishes and dimensioned drawings of the keypads and inside handles. The 5100 is the knob handle style on it; this lock pairs it with the BL5000 series lever keypad.
Borg BL5001, BL5201 and BL5401 Drilling Template (PDF)
One-page drilling template (159mm hole centres, 60mm or 70mm backset) named for the single-sided BL5001, BL5201 and BL5401 lever locks. Check the fixing positions for this back-to-back with us before drilling.
One-page drilling template (159mm hole centres, 60mm or 70mm backset) named for the single-sided BL5001, BL5201 and BL5401 lever locks. Check the fixing positions for this back-to-back with us before drilling.
Borg 5000 Series Accessories Sheet (PDF)
Borg's one-page accessories sheet for the 5000 series - the BL5000KSC / BL5000KSS keypad-only units, the Lockwood mortice conversion kits and the SPBL5001 scar plates. The BL5000KSC / BL5000KSS on it is the spare for this lock's lever side - confirm the fit with us.
Borg's one-page accessories sheet for the 5000 series - the BL5000KSC / BL5000KSS keypad-only units, the Lockwood mortice conversion kits and the SPBL5001 scar plates. The BL5000KSC / BL5000KSS on it is the spare for this lock's lever side - confirm the fit with us.
Borg Lock Servicing Guide (PDF)
Borg's general maintenance guide for pushbutton keypad locks - monthly silicone-based lubricant care and an annual full service. This is the routine to follow for this lock.
Borg's general maintenance guide for pushbutton keypad locks - monthly silicone-based lubricant care and an annual full service. This is the routine to follow for this lock.
Borg BL5151SC - FAQ, Setup and Owner's Guide
Everything below is here to help you choose, install, code and live with the BL5151SC knob and lever back-to-back lock. For the wider category, start with Buyer's Guide Chapter 16 - Mechanical Digital Locks and the pillar explainer What Is a Mechanical Digital Lock?
Knob and Lever - Which Side Gets Which
When would I choose a knob and lever back-to-back over lever/lever or knob/knob?
When the two faces are used differently. The knob keeps a lower profile, so it suits a corridor face with little clearance or a side that is used less; the lever is easier to grip, so it suits the main access face and anyone who finds a knob hard to turn. If both faces are used equally, the lever/lever BL5051 is generally the better fit; for knob keypads on both faces there is the BL2020SC on the BL2000 platform. See when to consider a double-sided lock.
When the two faces are used differently. The knob keeps a lower profile, so it suits a corridor face with little clearance or a side that is used less; the lever is easier to grip, so it suits the main access face and anyone who finds a knob hard to turn. If both faces are used equally, the lever/lever BL5051 is generally the better fit; for knob keypads on both faces there is the BL2020SC on the BL2000 platform. See when to consider a double-sided lock.
Does the knob side work any differently from the lever side?
Only in the handle. On the knob side, enter the code and turn the knob; on the lever side, enter the code and push the lever down. Both keypads carry the same buttons (numbers, F and C), both handles are clutching, and each side has its own coding chamber and its own free passage setting.
Only in the handle. On the knob side, enter the code and turn the knob; on the lever side, enter the code and push the lever down. Both keypads carry the same buttons (numbers, F and C), both handles are clutching, and each side has its own coding chamber and its own free passage setting.
Which face should get the knob, and how is the handing set?
There is no fixed rule - choose the faces by how the door is used, then set the handing. Both handles are reversible on site: remove the rubber grommet at the base of the handle, take out the grub screw with the supplied hex wrench, rotate the handle 180 degrees, refit and tighten. Units ship factory set for right-hand doors, and the handing chart is in the Non-ECP manual (PDF). Background: how to determine door handing.
There is no fixed rule - choose the faces by how the door is used, then set the handing. Both handles are reversible on site: remove the rubber grommet at the base of the handle, take out the grub screw with the supplied hex wrench, rotate the handle 180 degrees, refit and tighten. Units ship factory set for right-hand doors, and the handing chart is in the Non-ECP manual (PDF). Background: how to determine door handing.
Codes and Code Changing
How does the code entry actually work - is it like a phone keypad?
Not quite. This is a purely mechanical coding chamber: each keypad holds one code, and the digits are pressed in any order - the chamber only cares that the correct set of buttons is depressed. Press C first to clear any half-entered attempt, enter the code, then turn the knob or push the lever.
Not quite. This is a purely mechanical coding chamber: each keypad holds one code, and the digits are pressed in any order - the chamber only cares that the correct set of buttons is depressed. Press C first to clear any half-entered attempt, enter the code, then turn the knob or push the lever.
Should I set the codes before the lock goes on the door?
Yes. The codes can be set with the keypads on or off the door, but On The Bench is far easier - so set and verify both side codes before mounting. Know the current code, work with the door open, and test five times per side.
Yes. The codes can be set with the keypads on or off the door, but On The Bench is far easier - so set and verify both side codes before mounting. Know the current code, work with the door open, and test five times per side.
How long does an On The Bench code change really take?
Allow 20-30 minutes per side the first time, and 5-10 minutes per side once practised. The steps: keypad off the door, 4 red screws out, cover panel lifted carefully (springs attached), C held down, tweezers to move the red and blue code pieces, panel back on, five successful tests, then rehang. The honest time comparison across Borg's methods is at how long code changes take, and the method itself at the Borg standard method.
Allow 20-30 minutes per side the first time, and 5-10 minutes per side once practised. The steps: keypad off the door, 4 red screws out, cover panel lifted carefully (springs attached), C held down, tweezers to move the red and blue code pieces, panel back on, five successful tests, then rehang. The honest time comparison across Borg's methods is at how long code changes take, and the method itself at the Borg standard method.
What are the classic On The Bench code change mistakes?
Letting go of C part-way through, refitting a code piece with its square cut-out facing inward or its coloured mark facing down, dropping a code piece (work over a tray), and rehanging without testing. The rules that prevent a lockout: know the current code, work with the door open, test five times per side. Full trap list: bench method traps.
Letting go of C part-way through, refitting a code piece with its square cut-out facing inward or its coloured mark facing down, dropping a code piece (work over a tray), and rehanging without testing. The rules that prevent a lockout: know the current code, work with the door open, test five times per side. Full trap list: bench method traps.
What are the spare red and blue code pieces in the box for?
Red code pieces are coded (that button becomes part of the PIN), blue are uncoded. The spares let you lengthen or shorten a code - 3 to 7 digits. Extra code pieces are available from us, and the free passage F piece (BLSFTUMBLER) is sold separately - see spare code pieces explained.
Red code pieces are coded (that button becomes part of the PIN), blue are uncoded. The spares let you lengthen or shorten a code - 3 to 7 digits. Extra code pieces are available from us, and the free passage F piece (BLSFTUMBLER) is sold separately - see spare code pieces explained.
Can free passage be engaged on one side only?
Yes. Free passage is set per side: enter that side's code and press F before you turn the knob or push the lever, and that handle stays free while the other side still needs its code - a busy main side can run free during business hours while the corridor side stays coded. Press F then C to cancel. Background: passage mode vs holdback mode.
Yes. Free passage is set per side: enter that side's code and press F before you turn the knob or push the lever, and that handle stays free while the other side still needs its code - a busy main side can run free during business hours while the corridor side stays coded. Press F then C to cancel. Background: passage mode vs holdback mode.
What happens if the code is forgotten - is there a key backup?
No - there is no key override on this model, which also means no cylinder to pick or corrode. With the door open, the code can be read from the code piece pattern On The Bench. With the door shut and both sides coded, it is a locksmith visit - contact us. If site policy requires a keyed bypass, the BL5771MGPROECP is the back-to-back with key override on both faces.
No - there is no key override on this model, which also means no cylinder to pick or corrode. With the door open, the code can be read from the code piece pattern On The Bench. With the door shut and both sides coded, it is a locksmith visit - contact us. If site policy requires a keyed bypass, the BL5771MGPROECP is the back-to-back with key override on both faces.
Can multiple people have their own codes, and is there a record of who came through?
No - one active code per keypad, no user list, no audit trail. That is the honest trade-off of every mechanical digital lock against an app-based system: see what these locks will not do and mechanical vs smart compared.
No - one active code per keypad, no user list, no audit trail. That is the honest trade-off of every mechanical digital lock against an app-based system: see what these locks will not do and mechanical vs smart compared.
Fire Doors and Exit Paths
Is a code-to-exit lock allowed on a fire door?
No. A back-to-back lock needs a code to get out, so it is not for fire doors, and not for emergency exit or fire egress doors. For a fire door, choose a single-sided lock with a free inside lever: the BL5001 is fire tested to AS 1905.1-2005 (up to 4 hours, depending on the type of doorset). Background: exit paths, fire door certification, and why passage functions are not a fire-door fix.
No. A back-to-back lock needs a code to get out, so it is not for fire doors, and not for emergency exit or fire egress doors. For a fire door, choose a single-sided lock with a free inside lever: the BL5001 is fire tested to AS 1905.1-2005 (up to 4 hours, depending on the type of doorset). Background: exit paths, fire door certification, and why passage functions are not a fire-door fix.
Ordering and Fit
Which spindle do I use for my door thickness?
Two spindles are supplied (80mm and 90mm). The rule: door thickness + 30mm = minimum spindle length, because 15mm must seat into each keypad body. Use the longest that fits, and never cut a spindle shorter than necessary. The standard fixings suit doors 35-54mm thick - for a thicker door, contact us before ordering.
Two spindles are supplied (80mm and 90mm). The rule: door thickness + 30mm = minimum spindle length, because 15mm must seat into each keypad body. Use the longest that fits, and never cut a spindle shorter than necessary. The standard fixings suit doors 35-54mm thick - for a thicker door, contact us before ordering.
Can I get a 70mm backset?
Yes - the satin chrome BLL500070 is the 70mm latch for the BL5000 series.
Yes - the satin chrome BLL500070 is the 70mm latch for the BL5000 series.
Is there a spare keypad?
For the lever side, the BL5000KSC (satin chrome) is the 5000 series lever keypad-only unit, coded On The Bench like this lock - confirm the fit with us before ordering. Knob side spares can be arranged through us - contact us.
For the lever side, the BL5000KSC (satin chrome) is the 5000 series lever keypad-only unit, coded On The Bench like this lock - confirm the fit with us before ordering. Knob side spares can be arranged through us - contact us.
Can the BL5151SC go on an external door or a gate?
It is not the right lock for that. The satin chrome finish is for internal doors - not for external, coastal or saline positions. For a gate or an external door that needs a code on both sides, look at the BL5051 (its Black MG Pro variant is the coastal choice) or the Easicode Pro BL5051MGPROECP.
It is not the right lock for that. The satin chrome finish is for internal doors - not for external, coastal or saline positions. For a gate or an external door that needs a code on both sides, look at the BL5051 (its Black MG Pro variant is the coastal choice) or the Easicode Pro BL5051MGPROECP.
Range and Spares
Which parts are actually replaceable if something wears?
The latch (BLL5000), the F piece (BLSFTUMBLER), the scar plates (SPBL5001), the lever keypad (BL5000KSC) and knob side spares through us - see the Accessories and Spare Parts table. This spare parts depth is a core reason to buy a supported platform over a hardware store lookalike.
The latch (BLL5000), the F piece (BLSFTUMBLER), the scar plates (SPBL5001), the lever keypad (BL5000KSC) and knob side spares through us - see the Accessories and Spare Parts table. This spare parts depth is a core reason to buy a supported platform over a hardware store lookalike.
Is this heavy duty enough for a busy commercial doorway?
It is a medium to heavy duty lock - Borg makes the BL5000 series for medium to heavy duty doors - but it is not built for extremely high traffic without a servicing schedule. For genuinely relentless traffic, step up to a true heavy-duty platform: the Borg BL7701, Lockwood 3572DX or the dual-keypad Carbine CDL7200LL-KDSC-HD. Guidance at Ch 16 commercial use.
It is a medium to heavy duty lock - Borg makes the BL5000 series for medium to heavy duty doors - but it is not built for extremely high traffic without a servicing schedule. For genuinely relentless traffic, step up to a true heavy-duty platform: the Borg BL7701, Lockwood 3572DX or the dual-keypad Carbine CDL7200LL-KDSC-HD. Guidance at Ch 16 commercial use.
How does it compare with a smart lock that has keypads on both sides?
A smart lock can store many user codes, log who came through and be managed from an app; the BL5151SC stores one code per side, logs nothing and needs no power. Where an audit trail or many users matter, a smart lock is the better fit; for simple both-sided code control with nothing to charge, the BL5151SC does the job. The honest comparison is at Ch 16 mechanical vs smart.
A smart lock can store many user codes, log who came through and be managed from an app; the BL5151SC stores one code per side, logs nothing and needs no power. Where an audit trail or many users matter, a smart lock is the better fit; for simple both-sided code control with nothing to charge, the BL5151SC does the job. The honest comparison is at Ch 16 mechanical vs smart.
Servicing
What ongoing servicing does it need?
Monthly, a light wipe of both keypads, the knob, the lever and the exposed latch with a silicon-based lubricant (such as GT85) - never an oil-based lubricant such as WD-40. Once a year, take the keypads off the door, spray through the code piece holes on the back of each keypad and over the fixings and latch, then check every button, the knob and the lever. The full schedule is in the Borg Servicing Guide (PDF Files tab).
Monthly, a light wipe of both keypads, the knob, the lever and the exposed latch with a silicon-based lubricant (such as GT85) - never an oil-based lubricant such as WD-40. Once a year, take the keypads off the door, spray through the code piece holes on the back of each keypad and over the fixings and latch, then check every button, the knob and the lever. The full schedule is in the Borg Servicing Guide (PDF Files tab).
Related Products, Guides and Chapters
This lock and its siblings: BL5101 - Single-Sided Knob Keypad - BL5051 - Lever/Lever BTB - BL5051MGECP - External Grade ECP - BL5051MGPROECP - Marine ECP Black - BL5771MGPROECP - BTB with Key Override - BL5050SC - Euro Mortice BTB, Key Lockout - BL5001 - Single-Sided, Free Egress - BL2020SC - Knob/Knob BTB, BL2000 Series
Accessories and spares: F Piece - Tube Latch 60mm - Tube Latch 70mm - Spare Lever Keypad - Satin - Stainless Scar Plates - Black Scar Plates - LB22 Weld-On Lock Box
Cross-brand alternatives: Carbine CDL7200LL-KDSC-HD Dual Keypad - Lockwood 3572DX - Borg BL7701 Heavy Duty
Buyer's Guide chapters: Ch 16 Mechanical Digital Locks - Ch 16 Borg Naming Decoded - Ch 16 Code Changing Methods - Ch 16 Choosing a Model - Ch 10 Borg Brand Profile
Helpful blog reading: Changing Codes - The Bench Method - What Is a Mechanical Digital Lock? - Why Double-Sided Locks Suit Gates - Passage Mode vs Holdback Mode - Heavy Duty Commercial Mech-Digi - Why Our Range Beats Imitations
What's In The Box - Borg BL5151SC
Borg BL5000 series non-ECP accessories packs - the parts supplied with the BL5151SC
- Borg BL5151SC knob keypad assembly (satin chrome)
- Borg BL5151SC lever keypad assembly (satin chrome)
- 60mm heavy duty anti-thrust tubular latch
- Strike plate and box keep
- 2 x spindles (80mm and 90mm)
- 4 x 16mm screws
- 2 x M4 x 40mm screws
- 2 x M4 x 50mm screws
- 2 x M4 x 60mm screws
- 2 x coded code pieces (red - spare)
- 2 x non-coded code pieces (blue - spare)
- Tweezers (for the On The Bench code change)
- Long hex wrench (Allen key)
- 2 x handle screw rubber grommets (one per side)
- Installation instructions
A 70mm backset latch (BLL500070) is available separately. No batteries or wiring are required or supplied.
Borg BL5151SC - Dimensions
Two drawings: the BL5000 series lever keypad on one face and the BL5100 series knob keypad on the other.
Lever keypad side (BL5000 series): Borg's orthographic drawing of the keypad - 177mm high, 48mm wide and 26mm deep; the drawing also marks the lever at 115mm and 89mm.
Knob keypad side (BL5100 series): 48mm wide x 177mm high; 75mm deep to the knob end; 26mm door-face projection; 59mm knob.
Standard 60mm backset (70mm latch available separately). Fixings suit doors 35-54mm thick.
Borg BL5000 Series - Product Brochure
BL5000 Series brochure - handle styles, locking options, features, finishes and keypad dimensions
PDF Files - Borg BL5151SC
Borg BL5000 Series Non-ECP Manual (PDF)
Borg's five-page manual for the On The Bench BL5000 series - parts list, handing, latch fitting, the code change, the F button free passage function, troubleshooting and a drilling template. It is written around the single-sided lever models; on this back-to-back the same code change steps apply to each keypad, knob side and lever side.
Borg's five-page manual for the On The Bench BL5000 series - parts list, handing, latch fitting, the code change, the F button free passage function, troubleshooting and a drilling template. It is written around the single-sided lever models; on this back-to-back the same code change steps apply to each keypad, knob side and lever side.
Borg BL5000 Series Installation and Code Change Guide (PDF)
Borg's five-page parts list, installation, On The Bench code change and troubleshooting guide for the BL5000 round bar lever series. The code change method inside is the one used on both of this lock's keypads; its latch fitting steps are written for the lever models.
Borg's five-page parts list, installation, On The Bench code change and troubleshooting guide for the BL5000 round bar lever series. The code change method inside is the one used on both of this lock's keypads; its latch fitting steps are written for the lever models.
Borg BL5000 Series Brochure (PDF)
The BL5000 series in one page - handle styles (round bar, flat bar and knob), locking options including the back-to-back model, features (over 2,000 combinations, 100,000 cycles, free passage), finishes and dimensioned drawings of the keypads and inside handles. The 5100 is the knob handle style on it; this lock pairs it with the BL5000 series lever keypad.
The BL5000 series in one page - handle styles (round bar, flat bar and knob), locking options including the back-to-back model, features (over 2,000 combinations, 100,000 cycles, free passage), finishes and dimensioned drawings of the keypads and inside handles. The 5100 is the knob handle style on it; this lock pairs it with the BL5000 series lever keypad.
Borg BL5001, BL5201 and BL5401 Drilling Template (PDF)
One-page drilling template (159mm hole centres, 60mm or 70mm backset) named for the single-sided BL5001, BL5201 and BL5401 lever locks. Check the fixing positions for this back-to-back with us before drilling.
One-page drilling template (159mm hole centres, 60mm or 70mm backset) named for the single-sided BL5001, BL5201 and BL5401 lever locks. Check the fixing positions for this back-to-back with us before drilling.
Borg 5000 Series Accessories Sheet (PDF)
Borg's one-page accessories sheet for the 5000 series - the BL5000KSC / BL5000KSS keypad-only units, the Lockwood mortice conversion kits and the SPBL5001 scar plates. The BL5000KSC / BL5000KSS on it is the spare for this lock's lever side - confirm the fit with us.
Borg's one-page accessories sheet for the 5000 series - the BL5000KSC / BL5000KSS keypad-only units, the Lockwood mortice conversion kits and the SPBL5001 scar plates. The BL5000KSC / BL5000KSS on it is the spare for this lock's lever side - confirm the fit with us.
Borg Lock Servicing Guide (PDF)
Borg's general maintenance guide for pushbutton keypad locks - monthly silicone-based lubricant care and an annual full service. This is the routine to follow for this lock.
Borg's general maintenance guide for pushbutton keypad locks - monthly silicone-based lubricant care and an annual full service. This is the routine to follow for this lock.
Borg Locks Warranty
Borg products sold in Australia are covered against mechanical defects in materials and workmanship under normal use and service. Warranty claims are handled by Terry's Tradies Pty Ltd and its associated websites, trading names, and subsidiaries.
Warranty Summary
What the Warranty Covers
- Mechanical defects in materials and workmanship
- Defects arising under normal use and service conditions
- Repair or replacement of defective units at the discretion of the Australian distributor (LSC)
What the Warranty Does Not Cover
- Damage arising from misuse, vandalism, or abuse
- Damage resulting from improper installation
- Locks that have been dismantled - dismantling invalidates the warranty
- Normal wear and tear
- Cosmetic damage not affecting function
How to Make a Claim
For full returns and warranty claim procedures, visit our Returns & Warranty page - this is kept up to date and is the authoritative reference for current claim steps.
- Contact Terry's Tradies Pty Ltd first if you purchased through us or one of its associated trading names - we will assess the issue and manage the warranty process with LSC on your behalf. You do not need to contact LSC or Borg Locks UK directly.
- Have your proof of purchase ready (receipt or order confirmation).
- Warranty claims for Borg products in Australia are processed through LSC, the authorised Australian importer and distributor. Where an item is returned to LSC, freight charges must be prepaid and the item returned within the warranty period.
- If LSC finds the returned item to be defective, it will be repaired or replaced, and a detailed assessment report is provided to the customer after examination.
Australian Consumer Law
Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure. The Borg manufacturer warranty above operates alongside - and does not limit - these statutory rights.
Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure. The Borg manufacturer warranty above operates alongside - and does not limit - these statutory rights.
Confused? Overwhelmed? We get it.
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