Borg BL5051 Mechanical Digital Lock – Back-to-Back Lever/Lever

Borg BL5051 Mechanical Digital Lock – Back-to-Back Lever/Lever – Multiple Finishes – Including Marine Grade Pro

The Borg BL5051 is a medium-heavy duty fully mechanical digital lock in a back-to-back (BTB) lever/lever configuration. Both sides of the door carry a full keypad and lever — a code is required to operate the door from either direction. There is no free inside lever; access from inside requires entering the correct PIN. Each keypad has an independent coding chamber, allowing a different code to be set on each side if required.

The BL5051 is fire rated to AS 1905.1-2005 (up to 4 hours depending on doorset) and cycle tested to 100,000+ operations. It is available in three finishes. The BL5051MGPRO (black) is not simply a colour variant — it carries Marine Grade Pro construction with 316 stainless steel internal components and MG Pro marine coating, 1,000hr salt spray tested. The BL5051MG and BL5051SC use standard external grade or PVD coatings and are not rated for coastal environments.

Estimated Warehouse Dispatch
Usually same day if ordered before 11am AEST (excluding weekends and Qld public holidays)

Fire Rated – AS 1905.1-2005
Successfully tested up to 4 hours (depending on doorset) on fire door assemblies in accordance with AS 1905.1-2005 Fire Resistant Doorsets.

BL5051MGPRO (Black) – Marine Grade Pro, Not Just a Colour
The black finish variant (BL5051MGPRO) is built with 316 stainless steel internal components and MG Pro black marine external coating, tested to 1,000 hours of continuous salt spray with corrosion resistance warranted for 12 months. This is a fundamentally different specification to the BL5051MG (chrome plate external grade) and BL5051SC (satin chrome PVD). Choose BL5051MGPRO for coastal, beachside, pool, and marine environments. Choose BL5051MG or BL5051SC for sheltered or interior applications.

Not Suitable for Coastal or Saline Environments
This external grade lock is designed for weather-resistant external use but is not rated for coastal, beachside, or saltwater-adjacent environments. For marine-grade construction, see the BL5051MGPROECP.

Corrosion Resistance Warranted – 12 Months
Borg warrants corrosion resistance for 12 months from date of sale under specified conditions.

Code Change Requires Lock Removal
This model uses a tumbler-based code system. To change the PIN, the lock must be removed and the cover plate removed (4 red screws). Hold the C tumbler depressed and use the supplied tweezers to reposition the red (coded) and blue (uncoded) tumblers. For on-door code change, see the BL5051MGPROECP or BL5051MGECP.

Back-to-Back Keypads – Code Required Both Sides
Full keypads on both sides of the door. A code must be entered to open the door from either direction. There is no free egress from the inside — confirm this suits your application and complies with fire egress or building regulations.

Independent Coding Chambers – Different Codes Each Side
Each keypad has its own independent coding chamber. Both sides can share the same code, or each can be set to a different code independently. The free passage function can also be engaged or disengaged per side independently.

Code Required to Exit – No Free Egress from Inside
The inside keypad requires the correct PIN before the lever operates. Confirm this complies with any fire egress or building regulations before purchasing.

Free Passage Function (F Button) – Independent Per Side
After entering the code and rotating the lever, press F to engage free passage mode – that side's lever becomes free-turning without requiring the code on each use. To exit free passage: rotate the lever and press C until an audible click is heard. The free passage function can be permanently disabled using the included plug.

Fully Mechanical – No Batteries Required
Entirely mechanical. No power source, no wiring, and no battery maintenance at any point.

Designed for medium to heavy usage areas

Not suitable for extremely high traffic without a servicing schedule
For maximum heavy duty: consider the Lockwood DX, Borg 7701, or Carbine CDL7000 Series.

Single PIN Code Only Per Keypad
Each keypad accepts one active PIN code at a time (codes can differ between sides).

Key Features

• Medium-heavy duty BL5000 series – strengthened clutch and coding chamber; cycle tested to 100,000+ operations.
• Back-to-back keypads – code required both sides; no free inside egress.
• Independent coding chambers – different codes can be set on each side.
• Free passage function per side – F button engages free-turning mode on that keypad independently.
• Fire rated to AS 1905.1-2005 for use on fire door assemblies (up to 4 hours depending on doorset).
• Fully mechanical – no batteries, no wiring, no power source.
• Over 1,000 code combinations per keypad; non-sequential entry.
• 60mm anti-thrust stainless steel tubular latch (70mm available separately); 28mm narrow stile latch (BLS275000) available for narrow frames.
• Soft grip lever handles both sides.
• Door thickness 35mm to 80mm (standard fixings); up to 85mm with XL fixing kit.
• Reversible on site for left or right hand doors.
• BL5051MGPRO (black) – 316 SS internals, MG Pro coating, 1,000hr salt spray tested, corrosion warranted 12 months.
• BL5051MG (chrome plate) – external grade, weather resistant, not coastal.
• BL5051SC (satin chrome) – PVD finish, sheltered external and internal use.

What's in the Box

• Borg BL5051 outside keypad and lever assembly
• Inside (rear) keypad and lever assembly
• 60mm heavy duty anti-thrust tubular latch
• Strike plate and box keep
• 2 × spindles (80mm and 90mm)
• M4 fixing screws (40mm, 50mm, 60mm options)
• 4 × 16mm screws
• 2 × coded tumblers (red – spare)
• 2 × non-coded tumblers (blue – spare)
• Tweezers (for code change)
• Hex wrench (Allen key)
• Handle screw rubber grommet

Suitable Uses

• Coastal, beachside, pool, and marine environments — specify BL5051MGPRO (black, Marine Grade Pro)
• Sheltered external applications — BL5051MG (chrome plate) or BL5051SC (satin chrome)
• Internal commercial, amenities, and storeroom doors requiring controlled access from both sides
• Fire-rated door assemblies on commercial, strata, and residential properties
• Medium to heavy usage applications where a battery-free, fire-rated, both-sides access control solution is required
• Plant rooms, server rooms, and utility areas where access needs to be controlled in both directions

Available Finish Variants – BL5051

For on-door ECP code change with Marine Grade Pro construction, see the BL5051MGPROECP. For on-door ECP code change in external grade chrome, see the BL5051MGECP.

Borg BL5051 Series – Full Product Family

All BL5051 models are back-to-back (BTB) lever/lever — code required both sides. All are fully mechanical with no batteries. The table below shows the key differences across the range.

ECP = Easicode Pro on-door code change. MG Pro = Marine Grade Pro – 316 SS internals – 1,000hr salt spray tested. Combinations per side; each side can be set to a different code independently.

Full Specifications

Dimensions

External keypad dimensions – BL5000 series

Inside keypad dimensions – BL5000 series (BTB)

Frequently Asked Questions

Additional Information

Setting Codes Before Installation:
For the tumbler code system, codes can be set with the lock on or off the door. Set and verify both side codes on the bench before installation. This avoids removing a fitted lock for the first code change and lets you confirm both sides work correctly before mounting.

BL5051MGPRO Marine Grade Maintenance:
Monthly: apply a light spray of silicon-based lubricant (GT85 or equivalent) to both keypad and lever surfaces; wipe off excess. Do not use oil-based lubricants. Annually: remove the lock and spray internally through the button holes; test all buttons and levers. Refer to the Borg Servicing Guide PDF for full maintenance instructions.

Fire Door Installations:
The BL5051 is fire rated to AS 1905.1-2005. When specifying for fire door use, confirm that all other hardware in the assembly is also fire-rated and compatible with the doorset certification. The fire rating depends on the doorset tested — confirm with the doorset manufacturer. Also note that the BTB configuration requires code entry from inside — confirm this complies with emergency egress requirements for your specific application.

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.

Purchased through Terry's Locksmiths? Contact Terry's Locksmiths first — we'll manage your warranty claim on your behalf. This warranty operates alongside your rights under the Australian Consumer Law.

Download PDF Resources
Borg BL5000 Series Non-ECP User Manual, Code Change Instructions and Cutting Template
Borg BL5000 Series Product Brochure
Borg Lock Servicing Guide