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A tubular lock is a variation of a pin tumbler lock, where the pins are arranged in a circle facing the front of the lock and are operated by a tubular key. It was once referred to as an ACE lock, with ACE being a trademark of the Chicago Lock Company, but the generic term tubular lock is far more common these days.
DOOR HARDWARE: TUBULAR LOCKS, MORTISE LOCKS, MULTI-POINT LOCKS. When you think about a door lock, the first word that comes to mind is security. Understanding the differences between various types of door locks will help you determine whether or not it will provide the level of security you want. The two most popular types of door hardware are tubular locks and multi-points locks.