Abstract: Disclosed is a handcuff having a pair of cheeks and jaw pivotally secured one to the other and movable between handcuff open and closed positions. The cheeks carry a lock assembly including a pivotally mounted bolt for locking the jaw and cheeks one to the other in the handcuff closed position and a leaf spring for biasing the bolt for movement into its locking position, the spring carrying a detent. The spring is slidable between a first position with the detent offset from the bolt to enable the bolt to move against the bias of the spring to unlock the jaw and a second position locating the detent in registry with the bolt to maintain the bolt in its locked position thus double locking the handcuff. A keyhole is provided through one of the cheeks and receives a bushing. The bushing terminates short of the other cheek and is disposed about a pin secured to the other cheek. Thus bolt head includes a shoulder located between the end of the bushing and the one cheek.