Standard Duty Deadbolts These Yale deadbolts are economical and durable, and are ideal for use as auxiliary locks on residential applications. 8101 - Yale 8100 Series Standard Duty Deadbolt (One side Deadbolt) 8111 - Yale 8100 Series Standard Duty Deadbolt (Single Cylinder with Thumb turn) 8121 - Yale 8100 Series Standard Duty Deadbolt (Double Cylinder Deadbolt)