Simplex 900 Series Cipher Lock Instructions

Written by irene a. blake
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Simplex 900 Series Cipher Lock Instructions
(Jupiterimages/ Images)

A cipher lock is a lock that uses a programmable code push-button system rather than a key, numeric or alphanumeric keypad or dial. Kaba Simplex 900 series locks are all-metal, weather-resistant cipher locks typically used on doors. Styles include deadbolt, spring latch and Department of Defense (DOD) compliant models in satin brass or satin chrome with true cipher-only systems or an optional key bypass. Opening and closing the Simplex 900 series cipher lock simply requires that you know your code.

Skill level:
Moderately Easy


  1. 1

    Grasp the thumb-style control knob. Turn it left.

  2. 2

    Push the buttons that correspond to the Roman numerals -- I, II, III, IV and V -- in the sequence that matches your code.

  3. 3

    Turn the control thumb knob right to unlock the door. Turn the door handle and open the door.

  4. 4

    Relock the door by closing it and then turning the control knob left and then letting it go. If you have a spring latch model, pull the door closed without turning the knob.

Tips and warnings

  • If you're trying to unlock models 906, 910, 935 or 938 and can't remember your code, simply insert the bypass key into the keyhole, turn it right, turn the door handle and open the door.
  • To lock the 906 and 910 models, insert the key in the keyhole, turn the key left and then back to the vertical position before pulling it from the keyhole.
  • If your code isn't working, try the factory code: push II and IV at the same time, then release the buttons. Push and release III and open the door.

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