Skip to main content

Borg BL2620MGBC Mechanical Digital Lock - Knob/Knob Back-to-Back - External Grade - Polished Chrome

Borg

Terry's In-Store Price $469.96
Terry's Online Price $389.18
(No reviews yet) Write a Review
SKU:
STK BL2620MGBC
UPC:
9329673057168
Availability:
Usually same day dispatch (if ordered before 11am)
Colour/Finish:
Satin Chrome
Type of Handle:
Knob
Back-Set:
60mm
Type of Lock:
Tubular Latch
atc-product:
737
Access Method:
Pin Code
Feature:
Rain Resistant
Adding to cart… The item has been added
Borg Locks logo

Borg BL2620MGBC Mechanical Digital Lock – Knob/Knob Back-to-Back – External Grade – Polished Chrome

At A Glance

At A Glance

PIN CodePIN Code

The Borg BL2620MGBC is a fully mechanical digital lock in a knob/knob back-to-back (BTB) configuration with an external grade polished chrome finish. Both sides of the door carry an identical knob keypad — the correct PIN must be entered to operate the knob from either side, so there is no free inside egress.

The external series finish uses layers of polished chrome plating over 316 grade stainless steel internal components, warranted to resist corrosion for 12 months in normal weather conditions. That makes it suited to sheltered external doors and general external-grade applications, but it is not rated for coastal or saline environments — for a knob/knob back-to-back lock built for that exposure, see the Borg BL2621 MG Pro ECP.

Fully mechanical — no batteries, no wiring, no power source of any kind. Suits doors from 35mm to 80mm thick. Code changing uses the traditional Borg tumbler system: the lock comes off the door, the cover plate lifts to expose the coding chamber, and red (coded) and blue (uncoded) tumblers are repositioned with the supplied tweezers. Over 1,000 non-sequential combinations are available.

Estimated Warehouse Dispatch
Usually same day if ordered before 11am AEST (excluding weekends and Qld public holidays)
Knob Keypad Both Sides – Code Required from Both Sides
The BL2620MGBC has a knob keypad on both sides of the door. Both knobs are clutched — free-turning only after the correct PIN is entered — and the same code operates both sides. There is no free inside egress: the correct code must be entered from whichever side you are on. Confirm this suits your application before purchasing; if free egress from inside is required, a single-sided Borg 2000/2600 series knob lock is the better fit. A back-to-back keypad also means a single lock can control two rooms or an internal/external pair from one code — see Why Double-Sided Locks Are a Smart Choice for the general case for BTB keypads.
Not Suitable for Coastal or Saline Environments
The BL2620MGBC uses an external grade polished chrome finish — not the Marine Grade Pro coating. It is warranted for corrosion resistance in normal weather conditions only. Do not specify this lock for coastal, beachside, poolside, or salt-laden environments. For marine grade construction in the same knob/knob back-to-back format, see the Borg BL2621 MG Pro ECP. MG Pro & ECP Explained covers the difference in salt-spray testing between the two grades.
Corrosion Resistance Warranted – 12 Months (Normal Weather)
Polished chrome finish over 316 grade stainless steel internal components. Warranted to resist corrosion in normal weather conditions for 12 months from date of sale. Not suitable for coastal or saline environments.
Code Change Requires Lock Removal – Tumbler / Tweezers Method
This model uses a tumbler-based code system, changed on the bench rather than on the door. Remove the lock, take out the 4 red retaining screws, carefully lift the cover plate (springs stay attached), hold the C tumbler depressed throughout, and use the supplied tweezers to reposition the red (coded) and blue (uncoded) tumblers — square cut-outs facing outward, coloured marks facing upward. Over 1,000 non-sequential combinations; spare tumblers let you shorten the code to 3–4 digits or lengthen it to 6–7 digits. See Changing Codes on Mechanical Digital Locks for the general bench-method walkthrough and realistic timing.
Holdback Facility
The BL2620MGBC includes a holdback facility. Once a knob has been turned to retract the latch, holdback can be engaged to keep that knob (and latch) retracted — allowing free passage on that side without code entry. Turn the knob to release. Useful when the door needs to stay open for extended periods, such as during a delivery or a busy trading window. See Passage Mode vs Holdback Mode for how holdback compares with full passage mode.
Fully Mechanical – No Batteries Required
Entirely mechanical. No power source, no wiring, and no battery maintenance at any point in the product's life.
Designed for light to medium usage areas – internal and sheltered external
Not suitable for high traffic commercial use
For heavy duty: consider the Lockwood 3572DX, the Borg BL7701, or the Carbine CDL7200LL.
Single PIN Code Only
Accepts one active PIN code at a time. The same code operates both sides.
Code Required to Exit – No Free Egress from Inside
The inside knob requires the correct PIN before it will retract the latch. Confirm this suits your application and complies with any applicable fire egress or building regulations before purchasing.

Key Features

  • Knob keypad on both sides – code required to enter and exit.
  • External grade polished chrome finish over 316 grade stainless steel internal components.
  • Corrosion resistance warranted 12 months under normal weather conditions.
  • Not suitable for coastal or saline environments.
  • Over 1,000 non-sequential code combinations; tumbler code system, changed on the bench.
  • Holdback facility – latch can be held retracted on either side for free passage.
  • Both knobs clutched – free-turning only once the correct code is entered.
  • Fully mechanical – no batteries, no wiring, no power source.
  • 60mm anti-thrust stainless steel tubular latch.
  • 8mm square drive spindle – compatible with most leading lock brands.
  • Suits doors from 35mm to 80mm thick.
  • Fully reversible for left or right hand doors.
  • 14-button keypad with large indented buttons on both sides.

Access Methods

Method Available Notes
PIN Code Yes Required on both the outside and inside knob keypad; single PIN operates both sides

What's in the Box

  • Borg BL2620MGBC outside knob keypad assembly (polished chrome)
  • Borg BL2620MGBC inside knob keypad assembly (polished chrome)
  • 60mm anti-thrust stainless steel tubular latch
  • Strike plate and box keep
  • Spindles (to suit door thickness 35–80mm)
  • M4 fixing screws
  • 2 × coded tumblers (red – spare)
  • 2 × non-coded tumblers (blue – spare)
  • Tweezers (for tumbler code change)
  • Hex wrench (Allen key)
  • Handle screw rubber grommet × 2

Suitable Uses

  • Internal and sheltered external doors requiring code access control from both sides
  • Office, strata, storage, and amenity doors where both-sided code entry is required without free inside egress
  • Applications where a polished chrome external-grade finish suits the door and building aesthetic
  • Sheltered external doors in normal (non-coastal) weather conditions requiring back-to-back code access
  • Doors between 35mm and 80mm thick where a back-to-back knob keypad format is preferred

Browse the full Digital Mechanical Locks range for other Borg, Lockwood, and Carbine mechanical digital options.

Available Finish Options

  • Polished Chrome
    Polished Chrome
    (This Product)
    STK BL2620MGBC

Finish selection does not affect functionality, compliance, or performance.

Item Code Family

Model Configuration Grade / Finish Code Change
BL2620MGBC (This Product) Knob/Knob Back-to-Back External Grade – Polished Chrome Tumbler (bench)
BL2600MGBC Knob outside / stub lever inside (single-sided – free inside egress) Satin Chrome Tumbler (bench)
BL2621 MG Pro ECP Knob/Knob Back-to-Back Marine Grade Pro – Black Easicode Pro (on-door)

BL2600MGBC is the single-sided version of this platform – a free-turning inside lever means no code is needed to exit. BL2621 MG Pro ECP is the marine-grade, on-door-code-change counterpart in the same back-to-back format as this product.

Accessories & Spares

Item Description Link
BL2600KMG Spare outside or inside knob keypad, external grade, chrome plated — the same knob keypad unit fitted to this lock's outside and inside assemblies. Order one to replace a single damaged side, or two to replace both. View Product
BL2600MGC Keypad cover for the BL2600 series external grade knob keypad — a protective cover for the exposed outside keypad when not in regular use. View Product

Spare coded and non-coded tumblers, and a spare spindle sized specifically for the external-grade BL2600 series, are not currently catalogued as standalone GCSL listings — get in touch with Terry's Locksmiths if you need spares beyond the tumblers already supplied in the box.

Full Specifications

Brand Borg Locks
Item Code BL2620MGBC
Series BL2600 External Grade – Back-to-Back
Finish Polished chrome plate (external grade; not Marine Grade Pro)
Internal Components 316 grade stainless steel
Corrosion Warranty 12 months in normal weather conditions; not suitable for coastal or saline environments
Configuration Knob/knob back-to-back; code required both sides
Inside Egress Code required from inside – no free egress
Key Override None
Code Change Tumbler system – lock removal required, bench change
Code Combinations Over 1,000; non-sequential; code length adjustable – 3–4 digits (shortened) or 6–7 digits (lengthened) using the supplied spare tumblers
PIN Codes Stored Single PIN code only
Holdback Yes – latch can be held retracted on either side for free passage
Spindle Drive 8mm square drive
Backset 60mm
Latch 60mm anti-thrust stainless steel tubular latch
Door Thickness 35–80mm
Operation Type Fully mechanical – no batteries, no power
Reversible Yes – fully reversible for left or right hand doors

Dimensions

Borg BL2620MGBC knob knob back-to-back external grade mechanical digital lock dimensional drawing showing outside knob keypad height width and depth alongside inside knob keypad and 60mm anti-thrust tubular latch profile measurements
BL2620MGBC – inside and outside knob keypad dimensional drawing with 60mm latch profile. This drawing is shared across the BL2620/BL2621 knob/knob back-to-back body — the physical body is identical across finish and grade variants.
Backset 60mm Standard tubular latch backset
Door thickness 35–80mm Spindles supplied for full range
Spindle drive 8mm square drive Compatible with most leading lock brands

Frequently Asked Questions

Is the BL2620MGBC a Marine Grade lock?
No. The BL2620MGBC is an external grade lock, not Marine Grade Pro. It uses a polished chrome finish over 316 stainless steel internal components, warranted to resist corrosion in normal weather conditions for 12 months. It is not suitable for coastal, beachside, poolside, or saline environments. For a marine-grade lock in the same knob/knob back-to-back format, see the Borg BL2621 MG Pro ECPMG Pro & ECP Explained covers the salt-spray testing difference between the two grades.
Can I open the door from inside without the code?
No. The BL2620MGBC has knob keypads on both sides. Both knobs are clutched and require the correct PIN to retract the latch, so there is no free inside egress. If you need free egress from inside, the single-sided Borg BL2600MGBC uses a free-turning inside lever instead. Confirm code-required-both-sides suits your application and complies with any applicable fire egress requirements before purchasing.
What is the holdback facility and how do I use it?
Holdback lets you keep the latch bolt retracted on a given side, so that side of the door can open and close freely without entering the code each time. To engage: enter the code, turn the knob to retract the latch, then hold the knob in the retracted position to engage holdback (this can be set independently on each side). To exit holdback, turn the knob to release. Useful during periods of high through-traffic when repeated code entry is inconvenient — see Passage Mode vs Holdback Mode for how this compares with full passage mode on other Borg models.
How do I change the PIN code, and how many combinations are there?
The lock has to come off the door. Remove the 4 red screws, carefully lift the cover plate (springs stay attached), hold the C tumbler depressed throughout, then use the supplied tweezers to reposition the red (coded) and blue (uncoded) tumblers — square cut-outs facing outward, coloured marks facing upward. Test the new code before reinstalling. There are over 1,000 non-sequential combinations, and the code can be entered in any order. Spare tumblers let you shorten the code to 3–4 digits or lengthen it to 6–7 digits. See Changing Codes on Mechanical Digital Locks for the general walkthrough and realistic timing.
What door thickness does this lock suit, and how does it compare to the BL2600MGBC?
The BL2620MGBC suits doors from 35mm to 80mm thick using the spindles supplied. The BL2600MGBC is the single-sided version of this same platform – a knob keypad outside with a free-turning stub lever inside, so no code is needed to exit. Choose BL2620MGBC where code control in both directions is required; choose BL2600MGBC where free inside egress is needed.

Additional Information

Coastal and Saline Environments:
This lock is not rated for coastal or saline use. The polished chrome external grade finish will corrode in environments with airborne salt, high humidity, poolside chemicals, or direct saltwater exposure. For any installation near the ocean, a canal, a pool using salt chlorination, or a beachside location, specify the Borg BL2621 MG Pro ECP instead. Fitting an external grade lock in a marine environment will void the corrosion warranty. Lockwood vs Borg vs Carbine has an honest brand-by-brand corrosion comparison if you're weighing grades.
Setting Code Before Installation:
The tumbler code can be set on the bench before installation. Set and verify both sides' codes before mounting. This avoids removing a fitted keypad for the first code change and lets you confirm both sides work correctly before the lock goes into the door. A qualified locksmith can also carry this out for you — see Advice and Installation.
Spindle Selection:
Select the spindle length based on door thickness. General rule: door thickness + 30mm = minimum spindle length (15mm must seat into each keypad). For a 44mm door, use a minimum 74mm spindle. Do not cut the spindle shorter than necessary — an undersized spindle may disengage if the door is slammed.
Combinations Figure Corrected From Legacy Listing:
This page states over 1,000 code combinations, sourced from the Borg drilling template covering the BL2600–BL2700 series specifically. An older version of this listing quoted "over 8,000" without a matching source document — that figure has not been carried forward.
Replacing a Damaged Keypad:
Each side of this lock uses the same external-grade knob keypad, sold separately as the Borg BL2600KMG. If one side is damaged, you do not need to replace the whole lock — order a single replacement keypad for that side.
Warranty icon
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.
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 Non-ECP Locks Code Change Instructions (PDF)
Step-by-step tumbler code-changing procedure – remove the cover plate, reposition red and blue tumblers with the supplied tweezers.
Borg BL2600 Series Latch Instructions (PDF)
Tubular latch installation guide for the BL2600 series – strike plate, drilling, spindle, and keypad/handle fitting.
Borg BL2621 / BL2600 / BL2700 / BL4400 Series Drilling Template (PDF)
Fold-along drilling template plus the parts list and tumbler code-change procedure this page's combinations figure is sourced from.
Borg Lock Servicing Guide (PDF)
General maintenance guide for Borg mechanical pushbutton keypad locks.

 

Borg Locks logo

Borg BL2620MGBC – FAQ, Setup and Owner's Guide

Deeper questions on access, security, code changing, and suitability for the Borg BL2620MGBC. For a wider comparison across mechanical digital brands, see the Buyer's Guide's Mechanical Digital Locks chapter.

Access & Credentials

Does the same code work on both sides of the door?
Yes. The BL2620MGBC stores a single PIN, and that one code operates the outside knob keypad and the inside knob keypad identically. It does not support two different codes for the two sides.
How many code combinations does the BL2620MGBC support?
Over 1,000 non-sequential combinations, per Borg's own drilling template documentation for the BL2600–BL2700 series. The code can be entered in any order — it is not required to be pressed sequentially.
Is there a key override if I forget the code or the mechanism fails?
No. The BL2620MGBC has no mechanical key override on either side — access depends entirely on the correct PIN. If you need a backup key-based entry method, a Borg model with key override (such as the BL7701) or keeping the code recorded securely off-site is the alternative.

Locking & Safety

Is this lock suitable for a fire door or an emergency exit path?
Confirm this against your local fire and egress regulations before specifying. Because both sides of the BL2620MGBC require a code to operate, it does not provide free-turning exit without code entry — a requirement on many fire door and designated exit-path applications. Where free egress is mandatory, a single-sided model with a free-turning inside lever, such as the Borg BL2600MGBC, is the more appropriate choice.
Can someone force the knob to bypass the code?
Both knobs are clutched, meaning they spin freely without engaging the latch until the correct code is entered — this is the standard Borg anti-manipulation design across the mechanical digital range. As with any mechanical keypad lock, physical security also depends on correct installation, door and frame condition, and the strike/latch fit; see the installation PDFs in the PDF Files tab.

Weather & Finish

What's the practical difference between External Grade and Marine Grade Pro?
External Grade (this product) uses polished chrome plating over 316 stainless steel internals, warranted for 12 months of corrosion resistance in normal weather — suited to sheltered external and internal doors, not coastal exposure. Marine Grade Pro uses the MG Pro 2 coating and is salt-spray tested for coastal, beachside, and poolside use. MG Pro & ECP Explained covers the testing standards behind both grades in detail.
Is polished chrome the only finish available for this configuration?
Yes, on this specific knob/knob back-to-back external grade listing. Other finishes and grades exist elsewhere in the BL2600 platform — satin chrome on the single-sided BL2600MGBC, and black MG Pro 2 on the marine-grade BL2621 MG Pro ECP.

Installation & Setup

What tools do I need to install this lock myself?
A standard drill with the hole sizes shown in the drilling template PDF, a hex/Allen key (supplied), a screwdriver, and the tweezers supplied for the code change. Most DIY-competent installers can fit this lock in under an hour on a pre-prepared door; drilling a new door from scratch takes longer. If you'd rather not, Advice and Installation covers professional installation options.
Does this lock need to be ordered for a specific door handing?
No. The BL2620MGBC is fully reversible on site for left or right hand doors — there is no handed-specific ordering required, unlike some hook-bolt or deadbolt models in the wider Borg range.

Suitability

Would this suit a shared internal gate or a two-way storage room?
Yes — this is one of the more common genuine uses for a back-to-back knob keypad: an internal or sheltered gate, storage room, or plant room where you want the same code to control access from both directions without issuing separate keys. See Why Double-Sided Locks Are a Smart Choice for the general case.
Is this suitable for a high-traffic commercial entry?
No. This is a light-to-medium duty lock rated for internal and sheltered external doors, not high-traffic commercial entries. For that application, look at the Lockwood 3572DX, the Borg BL7701, or the Carbine CDL7200LL — the Heavy Duty Commercial Mechanical Digital Locks guide explains what separates commercial-grade from residential mechanical digital locks.

Related Products, Guides and Chapters

Borg Locks logo

What's In The Box - Borg BL2620MGBC

  • Borg BL2620MGBC outside knob keypad assembly (polished chrome)
  • Borg BL2620MGBC inside knob keypad assembly (polished chrome)
  • 60mm anti-thrust stainless steel tubular latch
  • Strike plate and box keep
  • Spindles (to suit door thickness 35–80mm)
  • M4 fixing screws
  • 2 × coded tumblers (red – spare)
  • 2 × non-coded tumblers (blue – spare)
  • Tweezers (for tumbler code change)
  • Hex wrench (Allen key)
  • Handle screw rubber grommet × 2
Code change requires lock removal. Set and verify codes on the bench before installation. Need a spare keypad down the track? Both sides use the same Borg BL2600KMG unit, sold separately.
Borg Locks logo

Borg BL2620MGBC - Dimensions

Borg BL2620MGBC knob knob BTB external grade mechanical digital lock dimensional drawing showing outside and inside knob keypad height width and depth with 60mm anti-thrust tubular latch profile measurements
BL2620MGBC – outside and inside knob keypad dimensional drawing with 60mm latch profile. Shared body drawing across the BL2620/BL2621 knob/knob back-to-back platform.
Borg Locks logo

PDF Files - BL2620MGBC

Borg Non-ECP Locks Code Change Instructions (PDF)
Step-by-step tumbler code-changing procedure – remove the cover plate, reposition red and blue tumblers with the supplied tweezers.
Borg BL2600 Series Latch Instructions (PDF)
Tubular latch installation guide for the BL2600 series – strike plate, drilling, spindle, and keypad/handle fitting.
Borg BL2621 / BL2600 / BL2700 / BL4400 Series Drilling Template (PDF)
Fold-along drilling template plus the parts list and tumbler code-change procedure this page's combinations figure is sourced from.
Borg Lock Servicing Guide (PDF)
General maintenance guide for Borg mechanical pushbutton keypad locks.
Borg Logo

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

Warranty period12 months from date of sale
What is coveredMechanical defects in materials and workmanship under normal use and service
Australian distributorLSC - the authorised Australian importer and distributor for Borg Locks
Who handles your claimTerry's Tradies Pty Ltd - contact us in the first instance
Proof of purchaseRequired for all claims
Geographic coverageAustralia

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.
  1. 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.
  2. Have your proof of purchase ready (receipt or order confirmation).
  3. 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.
  4. 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.
Ask our expert locksmith - 30 years experience

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.

Get Your Free Recommendation →

How it works - three easy steps:

1. Upload photos

A few clear shots of your door, lock and frame - inside and out.

2. We assess

Our locksmith reviews your setup and requirements - door type, weather exposure, how you want to use it.

3. You get a recommendation

A personalised recommendation tailored to your door, budget and needs. No pressure, no upsell.

Also useful while you are deciding: