Borg Mechanical Digital BL5151SC - Knob Keypad and Lever Keypad Back-to-Back - Satin Chrome
At A Glance
At A Glance
FINISHSatin Chrome
DISPATCHSame Day Before 11am
PIN Code (Both Sides) 
No Key Override 
No AppThe Borg BL5151SC is a fully mechanical digital back-to-back lock in a unique hybrid configuration: one side has a knob keypad (enter code, rotate knob to retract latch) and the other has a lever keypad (enter code, push lever down to retract latch). Both sides have a full 12-button keypad and an independent coding chamber - each side can be set to a different PIN code, or both sides can share the same code. A code must be entered from whichever side you are on. There is no free egress from inside. There is no key override.
This is the only model in the Borg mechanical digital range that combines a knob keypad on one face with a lever keypad on the other. The knob side provides a compact, low-projection profile - useful where clearance is limited on a corridor side or secondary access face. The lever side provides a larger, easier-to-grip handle on the primary access face. The coding chambers are completely independent - changing the code on one side has no effect on the other. Fire rated to AS 1905.1-2005 (up to 4 hours doorset dependent). Fully mechanical - no batteries, no wiring.
Code change uses the standard Borg tumbler bench method: remove the keypad from the door (4 red screws), reposition red and blue tumblers with the supplied tweezers. This is done per side, independently. See the bench method guide and Borg standard chamber notes before purchasing if you have not changed a non-ECP Borg lock before.
Estimated Warehouse Dispatch
Usually same day if ordered before 11am AEST (excluding weekends and Queensland public holidays)
Usually same day if ordered before 11am AEST (excluding weekends and Queensland public holidays)
Hybrid Back-to-Back - Knob Keypad One Side, Lever Keypad Other Side
The BL5151SC has a knob keypad on one face and a lever keypad on the other. Both sides carry a full 12-button keypad with independent coding chambers. Operating sequence on the knob side: enter code, rotate knob clockwise to retract latch. Operating sequence on the lever side: enter code, push lever down to retract latch. This is the only BL5000-series lock combining both handle formats in one unit. See our guide to why double-sided locks are used.
The BL5151SC has a knob keypad on one face and a lever keypad on the other. Both sides carry a full 12-button keypad with independent coding chambers. Operating sequence on the knob side: enter code, rotate knob clockwise to retract latch. Operating sequence on the lever side: enter code, push lever down to retract latch. This is the only BL5000-series lock combining both handle formats in one unit. See our guide to why double-sided locks are used.
Independent Coding Chambers - Different Codes Each Side (Optional)
Each keypad has its own independent coding chamber and tumbler set. Both sides can share the same code for simplicity, or each side can be set to a completely different PIN. This allows different user groups to hold different codes for their direction of access - neither group learns the other's code. Codes are changed per side separately using the bench tumbler method. See the bench code change guide.
Each keypad has its own independent coding chamber and tumbler set. Both sides can share the same code for simplicity, or each side can be set to a completely different PIN. This allows different user groups to hold different codes for their direction of access - neither group learns the other's code. Codes are changed per side separately using the bench tumbler method. See the bench code change guide.
Code Required to Exit - No Free Egress from Inside
Both the knob keypad and the lever keypad require the correct PIN to operate the handle and retract the latch. There is no free-turning inside handle, and there is no key override to bypass the code. Confirm this suits your application and complies with any applicable fire egress, emergency exit, or building code requirements before purchasing. For fire doors, confirm code-to-exit from inside is permissible in your specific doorset certification. If free inside egress is required, see the BL5001 (single-sided, free inside egress).
Both the knob keypad and the lever keypad require the correct PIN to operate the handle and retract the latch. There is no free-turning inside handle, and there is no key override to bypass the code. Confirm this suits your application and complies with any applicable fire egress, emergency exit, or building code requirements before purchasing. For fire doors, confirm code-to-exit from inside is permissible in your specific doorset certification. If free inside egress is required, see the BL5001 (single-sided, free inside egress).
Fire Rated - AS 1905.1-2005
Successfully tested for use on fire door assemblies in accordance with AS 1905.1-2005 Fire Resistant Doorsets, up to 4 hours depending on doorset. When specifying on a fire door, confirm all other hardware (hinges, seals, closers, frame) is also fire rated and compatible with the doorset's certification. Also confirm that the BTB code-to-exit configuration complies with the emergency egress requirements for the specific occupancy and doorset classification. See Fire Door Locks and our fire door certification guide.
Successfully tested for use on fire door assemblies in accordance with AS 1905.1-2005 Fire Resistant Doorsets, up to 4 hours depending on doorset. When specifying on a fire door, confirm all other hardware (hinges, seals, closers, frame) is also fire rated and compatible with the doorset's certification. Also confirm that the BTB code-to-exit configuration complies with the emergency egress requirements for the specific occupancy and doorset classification. See Fire Door Locks and our fire door certification guide.
Code Change Requires Removing the Keypad - Both Sides Independently
This model uses the standard Borg tumbler coding system - not Easicode Pro. To change the PIN on either side: remove the 4 red screws, carefully lift the cover plate (springs are attached to the back of the panel), hold the C tumbler depressed throughout the process, then use the supplied tweezers to reposition the red (coded) and blue (uncoded) tumblers. All tumbler square cut-outs must face outward and coloured marks must face upward. Each side is changed independently. Over 1,000 combinations available; code length adjustable from 3 to 7 digits using the spare tumblers supplied. Read the full Borg standard chamber notes and the bench code change traps before your first code change.
This model uses the standard Borg tumbler coding system - not Easicode Pro. To change the PIN on either side: remove the 4 red screws, carefully lift the cover plate (springs are attached to the back of the panel), hold the C tumbler depressed throughout the process, then use the supplied tweezers to reposition the red (coded) and blue (uncoded) tumblers. All tumbler square cut-outs must face outward and coloured marks must face upward. Each side is changed independently. Over 1,000 combinations available; code length adjustable from 3 to 7 digits using the spare tumblers supplied. Read the full Borg standard chamber notes and the bench code change traps before your first code change.
Free Passage Function (F Button) - Independent Per Side
Enter the correct code on the relevant side and operate the handle, then press F to engage free passage on that side. That side's handle becomes free-turning without code entry. To exit free passage: operate the handle and press C until an audible click is heard. Free passage operates independently on each side - engaging it on the knob side does not affect the lever side. Deactivatable with the included plug if not required. See our guide to passage mode.
Enter the correct code on the relevant side and operate the handle, then press F to engage free passage on that side. That side's handle becomes free-turning without code entry. To exit free passage: operate the handle and press C until an audible click is heard. Free passage operates independently on each side - engaging it on the knob side does not affect the lever side. Deactivatable with the included plug if not required. See our guide to passage mode.
Fully Mechanical - No Batteries Required, Ever
The BL5151SC is entirely mechanical. No power source, no wiring, no battery compartment. Both keypads operate through the mechanical tumbler coding system with no electronics. See how mechanical digital locks work.
The BL5151SC is entirely mechanical. No power source, no wiring, no battery compartment. Both keypads operate through the mechanical tumbler coding system with no electronics. See how mechanical digital locks work.
Designed for light to medium usage areas
Internal doors, meeting rooms, server rooms, secure storage, and amenity doors requiring both-sided code access control.
Internal doors, meeting rooms, server rooms, secure storage, and amenity doors requiring both-sided code access control.
Not suitable for high traffic commercial use
For heavy duty both-sided access: consider the Carbine CDL7200LL-KDSC-HD (dual BCA lever, dual keypad, heavy duty), Borg BL7701, or the heavy duty mech-digi guide.
For heavy duty both-sided access: consider the Carbine CDL7200LL-KDSC-HD (dual BCA lever, dual keypad, heavy duty), Borg BL7701, or the heavy duty mech-digi guide.
Single PIN Code Only Per Side
Each keypad holds one active PIN code at a time. Each side can hold a different code, but neither side stores multiple codes or user records. This is a characteristic of the mechanical tumbler coding chamber. See the limitations of mechanical digital locks.
Each keypad holds one active PIN code at a time. Each side can hold a different code, but neither side stores multiple codes or user records. This is a characteristic of the mechanical tumbler coding chamber. See the limitations of mechanical digital locks.
Key Features
- Unique hybrid back-to-back configuration - knob keypad on one side, lever keypad on the other. The only BL5000-series model combining both formats in one unit.
- Independent coding chambers per side - each side can be set to a different PIN, or both sides can share the same code.
- Code required from both sides - no free egress from inside on either side. No key override.
- Free passage function (F button) - independent per side; each side can be in or out of free passage independently.
- Tumbler code system - over 1,000 combinations per side; code length adjustable from 3 to 7 digits using the supplied spare tumblers.
- Fire rated to AS 1905.1-2005 (up to 4 hours depending on doorset).
- Fully mechanical - no batteries, no wiring, no electronics anywhere in the lock.
- Clutch protection on both lever and knob - handle free-spins until the correct code is entered.
- 8mm square drive spindle - compatible with most leading lock brands and the standard Australian lock preparation.
- 60mm backset heavy duty tubular latch.
- Door thickness 35mm to 54mm (standard fixings supplied).
- Satin chrome finish - suitable for internal use.
- Reversible on site for left or right hand doors.
Access Methods
Free Inside Egress
What's in the Box
- Borg BL5151 knob keypad assembly (satin chrome)
- Borg BL5151 lever keypad assembly (satin chrome)
- 60mm heavy duty anti-thrust tubular latch (60mm standard)
- 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 tumblers (red - for extending code length)
- 2 x non-coded tumblers (blue - for shortening code length)
- 1 x tweezers (for tumbler code change)
- 1 x long hex wrench (Allen key)
- 2 x handle screw rubber grommets (one per side)
- Installation instructions
Borg BL5000 Series non-ECP accessories packs - all parts included with the BL5151SC
No batteries, wiring, or electronic components are required or supplied. A 70mm backset latch (BLL500070) is available separately if required.
Suitable Uses
- Internal doors where controlled access in both directions is required and a different code per side may be preferred or needed - e.g. a door between a public corridor and a private office
- Applications where a compact knob profile is preferred on one side due to space constraints (corridor-facing or secondary access side)
- Fire-rated internal door assemblies requiring both-sided code access control - confirm code-to-exit from inside complies with egress requirements for the specific doorset certification
- Doors where each direction of access is managed by a different user group holding their own code - meeting rooms, server rooms, plant areas, staff-only zones
- Secure storage, amenity doors, and internal access control doors where battery-free operation is required. See Internal Office and Commercial Doors
- Applications where the unique knob/lever hybrid appearance is desired - visually distinguishes the two sides and helps users remember which side they are operating from
Available Finish Options
Satin Chrome
(This Product)
BL5151SC
Satin chrome is suitable for internal use only. The BL5151SC is not rated for coastal, saline, or exposed external environments.
BL5000 Back-to-Back Family
Accessories and Spare Parts
Spare red (coded) and blue (non-coded) tumblers for code length adjustment are supplied with the lock. Additional coded and non-coded tumblers can be sourced through Terry's Locksmiths. See spare tumbler guide.
Full Specifications
Dimensions
Lever keypad side (BL5000 series): 177mm H x 48mm W; lever projection 115mm; overall depth 89mm. Knob keypad side (BL5100 series): 177mm H x 48mm W; overall depth 75mm. Both sides: 26mm door-face projection. Door thickness range 35-54mm.
Lever keypad side - 177mm H x 48mm W; lever projection 115mm; 89mm depth
Knob keypad side - 177mm H x 48mm W; 75mm depth
Frequently Asked Questions
Why does this lock have a knob on one side and a lever on the other?
The BL5151SC is specifically designed for applications where a different handle format is preferred or required on each side. The knob side is more compact and suits locations with limited clearance on one face of the door, or where a different user experience per direction is desirable. The lever side provides a larger, easier-to-grip handle. Both sides have a full keypad and independent coding chambers, so each side can hold its own code. This is the only model in the Borg BL5000 range that combines both formats. If you need the same handle type on both sides, see the BL5101 (knob/knob) or BL5051 (lever/lever).
The BL5151SC is specifically designed for applications where a different handle format is preferred or required on each side. The knob side is more compact and suits locations with limited clearance on one face of the door, or where a different user experience per direction is desirable. The lever side provides a larger, easier-to-grip handle. Both sides have a full keypad and independent coding chambers, so each side can hold its own code. This is the only model in the Borg BL5000 range that combines both formats. If you need the same handle type on both sides, see the BL5101 (knob/knob) or BL5051 (lever/lever).
How do I change the PIN code, and do I need to remove the lock?
Yes, each keypad must be removed from the door to change its code. Remove the 4 red screws on the back of the keypad, carefully lift off the cover plate (springs are attached), hold the C tumbler depressed at all times, then use the supplied tweezers to reposition the red (coded) and blue (uncoded) tumblers. All tumbler square cut-outs must face outward and the coloured mark must face upward. Each side is changed independently. Full procedure at Borg standard chamber code change.
Yes, each keypad must be removed from the door to change its code. Remove the 4 red screws on the back of the keypad, carefully lift off the cover plate (springs are attached), hold the C tumbler depressed at all times, then use the supplied tweezers to reposition the red (coded) and blue (uncoded) tumblers. All tumbler square cut-outs must face outward and the coloured mark must face upward. Each side is changed independently. Full procedure at Borg standard chamber code change.
Can each side have a different code?
Yes. Each keypad has its own independent coding chamber and tumbler set. To set different codes on each side, change the tumblers on each side separately. The codes operate independently - entering the code on one side has no effect on the other side's chamber. Both sides can also share the same code if preferred - simply set both chambers to the same tumbler configuration. See our guide to the benefits of double-sided locks with independent codes.
Yes. Each keypad has its own independent coding chamber and tumbler set. To set different codes on each side, change the tumblers on each side separately. The codes operate independently - entering the code on one side has no effect on the other side's chamber. Both sides can also share the same code if preferred - simply set both chambers to the same tumbler configuration. See our guide to the benefits of double-sided locks with independent codes.
Is this lock fire rated, and can it be used on a fire egress door?
Yes, the BL5151SC is fire rated to AS 1905.1-2005 (up to 4 hours doorset dependent). However, the back-to-back configuration requires code entry from both sides - there is no free-turning inside handle. Before specifying on a fire door, confirm that code-to-exit from inside complies with the emergency egress requirements for your specific occupancy classification and doorset certification. In some buildings and some doorset certifications, the escape route requires a free-turning lever on the inside. Confirm with your fire door certifier or building surveyor. See our fire door certification guide.
Yes, the BL5151SC is fire rated to AS 1905.1-2005 (up to 4 hours doorset dependent). However, the back-to-back configuration requires code entry from both sides - there is no free-turning inside handle. Before specifying on a fire door, confirm that code-to-exit from inside complies with the emergency egress requirements for your specific occupancy classification and doorset certification. In some buildings and some doorset certifications, the escape route requires a free-turning lever on the inside. Confirm with your fire door certifier or building surveyor. See our fire door certification guide.
Which side should be the knob and which should be the lever, and how is handing set?
There is no fixed rule on which side gets which handle. Typically the knob side is installed on the less-used or more space-constrained face, and the lever side on the primary access face. Handing of the latch (left or right hand door) is reversible on site. For the knob side, remove the rubber grommet from the base of the handle to expose the grub screw, remove the screw, lift the handle off, rotate 180 degrees, refit and retighten. The lever side uses the same one-grommet/one-grub-screw process. Both operations are described in the NON-ECP User Manual.
There is no fixed rule on which side gets which handle. Typically the knob side is installed on the less-used or more space-constrained face, and the lever side on the primary access face. Handing of the latch (left or right hand door) is reversible on site. For the knob side, remove the rubber grommet from the base of the handle to expose the grub screw, remove the screw, lift the handle off, rotate 180 degrees, refit and retighten. The lever side uses the same one-grommet/one-grub-screw process. Both operations are described in the NON-ECP User Manual.
Additional Information
Set and Test Both Side Codes Before Installation
For the tumbler code system, codes can be set on or off the door. It is strongly recommended to set and test both side codes on the bench before installing the lock on the door. Set the knob side, test it at least five times. Set the lever side, test it at least five times. Only then install both sides to the door. This avoids the need to remove a fitted keypad from the door for the first code change. The full bench procedure is in the NON-ECP User Manual. Common traps at bench method traps.
For the tumbler code system, codes can be set on or off the door. It is strongly recommended to set and test both side codes on the bench before installing the lock on the door. Set the knob side, test it at least five times. Set the lever side, test it at least five times. Only then install both sides to the door. This avoids the need to remove a fitted keypad from the door for the first code change. The full bench procedure is in the NON-ECP User Manual. Common traps at bench method traps.
Spindle Selection - Use the Longest That Fits
Two spindles are supplied (80mm and 90mm). The general rule: door thickness + 30mm = minimum spindle length (each keypad needs 15mm of spindle). For a 45mm door use 80mm minimum. Do not cut spindles shorter than necessary. If too short, the spindle may disengage under a hard door slam, locking users out on both sides simultaneously. Spindle selection is described in the NON-ECP User Manual.
Two spindles are supplied (80mm and 90mm). The general rule: door thickness + 30mm = minimum spindle length (each keypad needs 15mm of spindle). For a 45mm door use 80mm minimum. Do not cut spindles shorter than necessary. If too short, the spindle may disengage under a hard door slam, locking users out on both sides simultaneously. Spindle selection is described in the NON-ECP User Manual.
Lockout Risk - No Key Override and No Free Egress
Unlike the BL5701 (key override in handle) or the BL5001 (free inside egress), the BL5151SC has no key override and no free-turning handle on either side. If a code is forgotten on both sides and free passage is not engaged, a locksmith is required for access. This is an important consideration in a back-to-back application where both sides require code entry. Always verify the code on both sides regularly, and consider engaging free passage on the primary access side during business hours.
Unlike the BL5701 (key override in handle) or the BL5001 (free inside egress), the BL5151SC has no key override and no free-turning handle on either side. If a code is forgotten on both sides and free passage is not engaged, a locksmith is required for access. This is an important consideration in a back-to-back application where both sides require code entry. Always verify the code on both sides regularly, and consider engaging free passage on the primary access side during business hours.
Comparing the Borg BTB Range
The BL5151SC is one of five Borg back-to-back formats. The BL5101 has knob keypads on both sides. The BL5051 has lever keypads on both sides (tumbler code change, multiple finishes). The BL5051MGECP has lever keypads both sides with Easicode Pro on-door code change. The BL5771MGPROECP adds Marine Grade Pro construction and key override on both sides. The BL5151SC (this page) is the only hybrid combining knob and lever in one unit. Compare all in the Item Code Family table or our double-sided lock guide.
The BL5151SC is one of five Borg back-to-back formats. The BL5101 has knob keypads on both sides. The BL5051 has lever keypads on both sides (tumbler code change, multiple finishes). The BL5051MGECP has lever keypads both sides with Easicode Pro on-door code change. The BL5771MGPROECP adds Marine Grade Pro construction and key override on both sides. The BL5151SC (this page) is the only hybrid combining knob and lever in one unit. Compare all in the Item Code Family table or our double-sided lock guide.
Understanding the Combinations Figure
The NON-ECP User Manual states "over 1,000 different combinations available." The code length is adjustable from 3 to 7 digits using the red (coded) and blue (uncoded) spare tumblers - shorter codes = fewer combinations, longer codes = more. The non-sequential nature of the system means buttons can be pressed in any order (e.g. 1234 = 4321 = 2431 - they all work). The 1,000+ figure covers the factory-set base configuration; the adjustable code length extends this. A locksmith can advise on optimal code length for your security requirement. See our any-order codes explained.
The NON-ECP User Manual states "over 1,000 different combinations available." The code length is adjustable from 3 to 7 digits using the red (coded) and blue (uncoded) spare tumblers - shorter codes = fewer combinations, longer codes = more. The non-sequential nature of the system means buttons can be pressed in any order (e.g. 1234 = 4321 = 2431 - they all work). The 1,000+ figure covers the factory-set base configuration; the adjustable code length extends this. A locksmith can advise on optimal code length for your security requirement. See our any-order codes explained.
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.
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.
Purchased through Terry's Locksmiths? Contact Terry's Locksmiths first - we manage your warranty claim on your behalf. This warranty operates alongside your rights under the Australian Consumer Law.
What's In The Box - Borg BL5151SC
- Borg BL5151 knob keypad assembly (satin chrome)
- Borg BL5151 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 tumblers (red - for code length adjustment)
- 2 x non-coded tumblers (blue - for code length adjustment)
- 1 x tweezers (for tumbler code change)
- 1 x long hex wrench (Allen key)
- 2 x handle screw rubber grommets
- Installation instructions
Borg BL5000 Series non-ECP accessories packs - all contents confirmed from Borg parts list
No batteries, wiring, or electronic components are included or required. A 70mm backset latch (BLL500070) is available separately if required.
Borg BL5151SC - Dimensions
Three dimensional drawings for the BL5151SC are shown below: the BL5000 series lever keypad side engineering drawing, the BL5100 series knob keypad side engineering drawing, and the legacy product drawings previously on this page. All measurements from Borg engineering drawings.
Lever keypad side (BL5000 series) - 177mm H x 48mm W; lever projection 115mm; 89mm depth; 26mm door-face projection
Knob keypad side (BL5100 series) - 177mm H x 48mm W; 75mm depth; 26mm door-face projection
Lever keypad side - legacy dimensional drawing
Knob keypad side - legacy dimensional drawing
Borg BL5000 Series - Product Brochure
BL5000 Series - full model range including BL5151SC knob/lever back-to-back, all handle configurations, fire rated variants and dimensions
Borg BL5151SC - In-Depth Questions and Answers
Extended Q&A for the Borg BL5151SC hybrid back-to-back mechanical digital lock. Also see: What Is a Mechanical Digital Lock?, Changing Codes on Mechanical Digital Locks, Why Double-Sided Locks Are a Smart Choice.
Configuration and Handle Selection
When would I choose a knob/lever hybrid over knob/knob or lever/lever?
The hybrid configuration is useful when the two sides serve different purposes or users. A knob keypad is more compact - good for a corridor-facing side with limited wall clearance, or a secondary access side used infrequently. A lever keypad is larger and easier to grip - better for a primary access side or for users who may have difficulty rotating a knob. If one user group has accessibility requirements, put the lever on their side. If both sides are equally used, lever/lever (BL5051) is generally preferable. If space is very tight on both sides, knob/knob (BL5101) is the alternative. The hybrid is a deliberate design choice, not a compromise. See the when to consider a double-sided lock guide.
The hybrid configuration is useful when the two sides serve different purposes or users. A knob keypad is more compact - good for a corridor-facing side with limited wall clearance, or a secondary access side used infrequently. A lever keypad is larger and easier to grip - better for a primary access side or for users who may have difficulty rotating a knob. If one user group has accessibility requirements, put the lever on their side. If both sides are equally used, lever/lever (BL5051) is generally preferable. If space is very tight on both sides, knob/knob (BL5101) is the alternative. The hybrid is a deliberate design choice, not a compromise. See the when to consider a double-sided lock guide.
Can the knob and lever keypad sides be interchanged - is there a fixed orientation?
No fixed orientation is specified by Borg. Either side can face either direction. However, handing of the latch (left or right hand door) is determined from the knob keypad side - this is the side considered the "outside." The handing chart in the NON-ECP User Manual shows right-hand-hung as the factory default (hinges on right when viewed from the knob keypad side). Choose which face gets the knob and which gets the lever based on your application needs, then set handing from the knob side. Both handles are reversible on site.
No fixed orientation is specified by Borg. Either side can face either direction. However, handing of the latch (left or right hand door) is determined from the knob keypad side - this is the side considered the "outside." The handing chart in the NON-ECP User Manual shows right-hand-hung as the factory default (hinges on right when viewed from the knob keypad side). Choose which face gets the knob and which gets the lever based on your application needs, then set handing from the knob side. Both handles are reversible on site.
Code Change and Operation
How difficult is the bench tumbler code change, and how long does it take?
The bench tumbler method is more involved than Easicode Pro but becomes straightforward once you have done it once. On first attempt allow 20-30 minutes per side. With practice, 5-10 minutes per side. The most common mistakes are: (1) not holding the C tumbler depressed throughout, which can dislodge internal components; (2) a tumbler with the square cut-out facing the wrong direction; (3) a coloured mark facing downward. Setting and testing codes on the bench before installation eliminates these traps. Full traps at bench method traps guide.
The bench tumbler method is more involved than Easicode Pro but becomes straightforward once you have done it once. On first attempt allow 20-30 minutes per side. With practice, 5-10 minutes per side. The most common mistakes are: (1) not holding the C tumbler depressed throughout, which can dislodge internal components; (2) a tumbler with the square cut-out facing the wrong direction; (3) a coloured mark facing downward. Setting and testing codes on the bench before installation eliminates these traps. Full traps at bench method traps guide.
What does "code is non-sequential" mean in practice?
Non-sequential means the buttons can be pressed in any order - 1, 2, 3, 4 works the same as 4, 3, 2, 1, or 2, 4, 1, 3. This is a feature, not a limitation: it makes the code impossible to observe by watching button press order. It also means the lock does not register double-presses differently - pressing 1 twice is the same as pressing 1 once. When setting a code, select buttons that are spread across the keypad and avoid obvious sequences. The same non-sequential principle applies to both the knob and lever sides. See any-order codes explained.
Non-sequential means the buttons can be pressed in any order - 1, 2, 3, 4 works the same as 4, 3, 2, 1, or 2, 4, 1, 3. This is a feature, not a limitation: it makes the code impossible to observe by watching button press order. It also means the lock does not register double-presses differently - pressing 1 twice is the same as pressing 1 once. When setting a code, select buttons that are spread across the keypad and avoid obvious sequences. The same non-sequential principle applies to both the knob and lever sides. See any-order codes explained.
Can free passage be engaged on one side only?
Yes. Free passage is completely independent on each side. Engaging free passage on the lever side allows that side to operate without entering the code - the knob side continues to require code entry. This can be a useful configuration during business hours: the lever side (primary access) is put into free passage to allow easy traffic, while the knob side (secondary or corridor side) continues to require code entry. To disengage: operate the handle on that side and press C until an audible click confirms code mode has been restored.
Yes. Free passage is completely independent on each side. Engaging free passage on the lever side allows that side to operate without entering the code - the knob side continues to require code entry. This can be a useful configuration during business hours: the lever side (primary access) is put into free passage to allow easy traffic, while the knob side (secondary or corridor side) continues to require code entry. To disengage: operate the handle on that side and press C until an audible click confirms code mode has been restored.
Fire Door Compliance
Can the BL5151SC be used on a fire escape route if code is required to exit?
This depends on the specific building code classification and the certified doorset. AS 1905.1-2005 certification of the lock itself does not guarantee compliance with every fire egress requirement - the doorset assembly as a whole must be certified, and the egress requirements depend on the occupancy class, the escape route designation, and the jurisdiction. Under NCC 2022 Clause D3D26, a door in an egress path must be openable from the inside without a key or special knowledge - which is generally interpreted to require a free-turning lever (turn and pull, no code). A BTB lock requiring code entry on the inside face would typically not satisfy D3D26 on a designated escape route. Confirm with your building surveyor or fire certifier for your specific application. See our exit path requirements guide.
This depends on the specific building code classification and the certified doorset. AS 1905.1-2005 certification of the lock itself does not guarantee compliance with every fire egress requirement - the doorset assembly as a whole must be certified, and the egress requirements depend on the occupancy class, the escape route designation, and the jurisdiction. Under NCC 2022 Clause D3D26, a door in an egress path must be openable from the inside without a key or special knowledge - which is generally interpreted to require a free-turning lever (turn and pull, no code). A BTB lock requiring code entry on the inside face would typically not satisfy D3D26 on a designated escape route. Confirm with your building surveyor or fire certifier for your specific application. See our exit path requirements guide.
What is the fire rating FRL (Fire Resistance Level) of the BL5151SC?
Borg does not publish a specific FRL figure (e.g. -/120/30) for the BL5000 series in their publicly available documentation. The lock is tested to AS 1905.1-2005 with results "up to 4 hours depending on doorset" - meaning the lock has passed fire testing within a compliant doorset, but the FRL of the complete door assembly depends on the doorset (door leaf, frame, hardware assembly), not the lock alone. When specifying for a fire door, request the full doorset fire test certificate from the door manufacturer and confirm the BL5151SC is listed as a compatible hardware item. For more on the difference between lock fire testing and doorset FRL, see our fire door lock testing guide.
Borg does not publish a specific FRL figure (e.g. -/120/30) for the BL5000 series in their publicly available documentation. The lock is tested to AS 1905.1-2005 with results "up to 4 hours depending on doorset" - meaning the lock has passed fire testing within a compliant doorset, but the FRL of the complete door assembly depends on the doorset (door leaf, frame, hardware assembly), not the lock alone. When specifying for a fire door, request the full doorset fire test certificate from the door manufacturer and confirm the BL5151SC is listed as a compatible hardware item. For more on the difference between lock fire testing and doorset FRL, see our fire door lock testing guide.
Product Selection
What if I need Easicode Pro (on-door code change) with a back-to-back configuration?
The BL5151SC uses the bench tumbler code change method - the keypad must be removed to change the code. If on-door ECP code change is required, the BL5051MGECP (lever/lever back-to-back with ECP) is the closest alternative. Note that the BL5051MGECP has lever keypads on both sides, not the hybrid knob/lever configuration. If you specifically need the hybrid format with ECP, a Locksmith solution using the BL5001 series on one side of a back-to-back arrangement may need to be discussed with Terry's - contact us for advice.
The BL5151SC uses the bench tumbler code change method - the keypad must be removed to change the code. If on-door ECP code change is required, the BL5051MGECP (lever/lever back-to-back with ECP) is the closest alternative. Note that the BL5051MGECP has lever keypads on both sides, not the hybrid knob/lever configuration. If you specifically need the hybrid format with ECP, a Locksmith solution using the BL5001 series on one side of a back-to-back arrangement may need to be discussed with Terry's - contact us for advice.
How does the BL5151SC compare to a dual-keypad smart lock?
A dual-keypad smart lock (such as the Carbine Connect or McGrath TTLock range) stores multiple user codes, logs access events, and supports remote management via an app. The BL5151SC stores one code per side, logs nothing, and requires no power. For secure rooms where audit trail, remote code management, or multiple user codes are needed, a smart lock is more appropriate. For simple both-sided access control in a battery-free installation, the BL5151SC delivers reliably with no ongoing maintenance beyond occasional code changes. See our mechanical vs smart lock comparison in Chapter 16.
A dual-keypad smart lock (such as the Carbine Connect or McGrath TTLock range) stores multiple user codes, logs access events, and supports remote management via an app. The BL5151SC stores one code per side, logs nothing, and requires no power. For secure rooms where audit trail, remote code management, or multiple user codes are needed, a smart lock is more appropriate. For simple both-sided access control in a battery-free installation, the BL5151SC delivers reliably with no ongoing maintenance beyond occasional code changes. See our mechanical vs smart lock comparison in Chapter 16.
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.
Choosing the right smart lock can be genuinely tricky - door types, backsets, app platforms, compatibility with your existing hardware... there is a lot to consider. We have decades of experience fitting locks of all types, including smart locks, and we are happy to help.
Our expert recommendation service is free. Upload a few photos of your door and describe what you need, and one of our qualified locksmiths will give you a personalised recommendation.
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