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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.
As youâll notice in the photo of the tubular lock pick trainer above, you have the spring, key pins (red) and driver pins (gold). This is also represented in the diagrams below as (red) key pins and (blue) driver pins. Each complete pin stack is pushed with help from itâs spring towards the front of the lock.