Key in Knob/Lever

ASSA Key in Knob/Key in Lever cylinders are manufactured to exact manufacturers’ specifications to ensure precise fit and operation while providing the ultimate in high security retrofit for a variety of leading cylindrical lockset manufacturers including Sargent, Arrow, Corbin-Russwin, Yale, Falcon and Schlage. All ASSA Maximum+ and Twin Series Key in Knob/Key in Lever cylinders are listed under U.L. 437 and are available in BHMA hardware finishes 626 and 606.



  • 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
  • Patented key control


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


  • All ASSA Maximum+ and Twin Series Key-in-Knob/Lever cylinders are U.L. 437 listed

Technical Information:

  • Available in 15 different retrofit assemblies
  • Cylinder shell and plug made of high quality brass
  • Stainless steel top pins
  • Bottom pins and master pins are nickel silver


BHMA Symbol US Symbol Description
626 US 26D Satin Chrome
606 US 4 Satin Brass