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 thumbturn or double cylinders on both sides, with different security levels for use in residential, commercial or intuitional applications. Medium Heavy Duty Deadbolts This Yale series is the ideal commercial grade deadbolt for use with Yale knob or door lever sets in heavy duty residential, medium duty commercial or intuitional applications. Standard Duty Deadbolts These Yale deadbolts are economical and durable, and are ideal for use as auxiliary locks on residential applications.