Master Lock No. 3685

Electronic Built-In Locker Lock


State-of-the-art locker systems deserve a lock to match. There was a time not long ago when clunky combo locks were the only option to keeping one’s personal affects secure at work, while working out, or at school. Those dark ages have past. With inspiration from other high-tech tools we use today, this new go-to lock for prestigious clubs, spas, and multi-athletic fitness centers is as satisfying to use as it is to look at.

In stock

SKU: 3685
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For more information or ordering assistance, please call our Cabinet Project Specialists at 877-439-5377 ext 9002

  • Large icons clearly show locker vacancy status
  • High-visibility display provides interactive feedback
  • Option to switch between single-user and multi-user settings and set code length to 4, 5 or 6 digits
  • A single CR123A 3V lithium battery lasts longer to help minimize maintenance
  • A low-battery alert notifies administrator when it’s time to replace the battery
  • 9V battery backup jump port can temporarily power the lock if battery dies
  • High-gloss keypad allows users to easily create personal codes
  • Sensors provide visual & audible alerts to signal if locking mechanism is blocked
  • Unique Backup Master Code allows administrative access to locker
  • Ability to turn sound on/off

Download Sell Sheet

GoKeyless™ is a factory trained and authorized Master Lock® dealer. Sales, service, support, valid warranties. It's why thousands of clients around the world choose GoKeyless™ for their security and access control needs each year. Designed to elevate the experience for facilities and users, the Master Lock 3685 Electronic Built-In Locker Lock combines a modern design with premium materials to offer improved functionality. The Electronic Built-In Locker Lock offers a new level of innovation with its high-visibility display screen for intuitive operation, long battery life to reduce operating costs, and anti-jamming features for reliable security. Suitable for most lockers - metal, wood or phenolic. Reversible design works on lockers with left or right hinges. Easy to retrofit. Strike plate included.
Locker Application

Metal, Phenolic, Wood


Bolt Housing: 3 (H) x 3 3/4 (W) x 1 5/16 (D) in., Display Unit: 3 15/16 (H) x 2 1/8 (W) x 1 (D) in.

Door Thickness Minimum

0.03 in.

Door Thickness Maximum

0.75 in.

Battery Type

CR123A 3V

Code Length

4 to 6 Digits

Locking Device


Door Handing



Master Lock


Master Lock

Access Type

Keypad – Digits


0.89 lbs


Manufacturer Limited Lifetime

Operating Temperature

0° to 125° F (-17° to 51° C)

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Customer Questions & Answers

  1. A

    For this model, there is 2 3/16" space between the center of the top bolt to the center of the bottom bolt. 

    From the center of the middle wire hole to the center of either bolt hole, the distance is 1 3/32".

  2. A

    The model 3685 does feature a similar mounting pattern to the MA1710. The administrative key is typically sold separately and is not included with every lock purchase. 

  3. A

    This unit is field reversible and can be used for either side.

  4. Q Is there a backup code or key if you forget the code? answer now
    Asked by Lisa on June 20, 2018 11:41 AM
    Yes, it has both a terminal for a 9v battery back up to be applied should you not change the batteries before the low battery warning runs out as well as a unique backup master code should a standard code be forgotten. 
  5. Q can this be used outside under cover? answer now
    Asked by Jenny Vance on December 5, 2017 2:31 PM
    A Yes it can, the key to this is the wet or damp exposure the lock will encounter. This lock does not have a weather seal. This leaves it vulnerable to water damage, thus damp environments are not recommended.

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