Rim Cylinders

Commonly used on apartment and condominium doors, ASSA rim cylinders are used on vertical deadbolt locks and are also designed for commercial exit and panic devices. Available with either horizontal/vertical break-off or lazy-motion type break-off tailpieces, ASSA rim cylinders can be ordered with the standard or the Sargent rim exit device mounting patterns. The standard rim cylinder can be easily converted to a mortise cylinder by simply replacing the rim tailpiece assembly with the appropriate cam.



  • Drill resistant cylinder housing and plug
  • Case-hardened steel inserts and stainless steel pins
  • Two independent locking mechanisms to ensure security and 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
  • Standard and Sargent hole pattern available
  • Standard rim cylinder is easily converted to mortise cylinder


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


  • All ASSA Maximum+ and Twin Series Rim cylinders are U.L. 437 Listed

Technical Information:

  • Available with limited rotation and/or unidirectional features
  • 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