Mortise Cylinders

ASSA provides a full line of mortise cylinders designed to retrofit into most leading lock manufacturers' locksets and exit devices including Sargent, Arrow, Schlage, Yale, Corbin-Russwin, Best, and Von Duprin. Mortise cylinders are offered in lengths ranging from 1-1/8" to 2" and BHMA finishes 625, 626, 605, 606, 612, and 624. For special sizes, please consult Customer Service. ASSA mortise and rim cylinders are available in removable core for quick and easy rekeying capabilities.



  • Drill resistant cylinder housing and plug
  • Case-hardened steel inserts and stainless steel pins
  • Two independent locking mechanisms to ensure optimum pick resistance
  • Inactive “false” grooves on side pins designed to increase pick resistance
  • Counter mill in each chamber position to further enhance pick resistance
  • Extremely close tolerances
  • Can be easily rekeyed in the field
  • With the purchase of one inexpensive kit, 1-1/8" mortise cylinder is easily converted to rim cylinder


  • ASSA warrants its cylinders against defective workmanship or wear resulting from defects for one year


  • All ASSA Maximum+ and Twin Series Mortise cylinders are U.L. 437 listed 

Technical Information:

  • Available in cylinder lengths 1-1/8" through 2" in 1/8" increments
  • Available with limited rotation and/or unidirectional features
  • 13 cam options available
  • Cylinder housing and plug are made of high quality brass
  • Stainless steel top pins
  • Bottom pins and master pins are nickel silver


BHMA Symbol US Symbol Description
625 US 26 Bright Chrome
626 US 26D Satin Chrome
605 US 3 Bright Brass
606 US 4 Satin Brass
612 US 10 Satin Bronze
624 US 10B Dark Oxidized Bronze

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