Products Catogories Yale Lock Sets Yale 8100 Series Deadbolts Yale 8100 Series Deadbolts Yale deadbolts are the ideal choice for complementary door security. These deadbolts are widely applied on front doors, with keyed knobs and lever handles, but can also be used in less security required spots such as shed doors. Yale deadbolt series come in two styles, a door cylinder with thumb-turn or double cylinders on both sides, with different security levels for use in residential, commercial or intuitional applications. 8101 - Standard Duty Deadbolt 8111 - Standard Duty Deadbolt 8121 - Standard Duty Deadbolt