Tubular pin tumbler lock

A tubular pin tumbler lock, also known as a circle pin tumbler lock, radial lock, or Ace lock after its original manufacturer, is a variety of pin tumbler lock in which a number of pins are arranged in a circular pattern, and the corresponding key is tubular or cylindrical in shape. Most locks use between six and eight pins, although some use as few as four or as many as ten.

The design of a tubular lock is similar to the pin tumbler lock, in that there are several stacks of pins. The key is a cylinder shape with notches cut around the outer or (rarely) inner edge. Each of these notches depresses a single pin inside the lock to a specific height allowing the lock cylinder to turn freely.

Tubular locks are commonly seen on bicycle locks (such as the Kryptonite lock), Kensington computer locks, elevators, and a variety of coin-operated devices such as vending machines, and coin-operated washing machines.

Tubular pin tumbler locks are generally considered to be safer and more resistant to picking than standard locks. This is primarily because they are often seen on coin boxes for vending machines and coin-operated machines, such as those used in a laundromat. However, the primary reason the locks are used in these applications is their lack of the depth requirement that most other locks require.

Such locks can be picked by a special tubular lock pick with a minimum of effort in very little time; it is also possible to defeat them by drilling with a hole-saw drill bit. Standard tubular-lock drill bit diameters are 0.375 in (9.5 mm) and 0.394 in (10.0 mm). To prevent drilling, many tubular locks have a middle pin made from hardened steel or contain a ball bearing in the middle pin.

Some tubular locks, such as those used on certain models of kryptonite bike locks, can be opened with the back end of a ball point pen.

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Wikipedia