![]() (Since lock orientation can vary by region, the alternate term "key pin" is preferred.)īritish Standard Lever Lock, BS Lock : this differs from a normal lever lock in that, it must have at least 1000 key differs, it must have anti drill plate, it must have anti saw rollers in bolt, it must be tested against crow bar attack to minimum standard, it must have a security curtain, it must have anti pick defences, ie anti pick notches or false gates, it must meet many other tests, but in short its tougher to pick and tougher to drill.īroaching : Part of the cross section of a keyway where metal has been removed.īypass : A method of opening a lock in which the part of the mechanism that is directly operated by the key is by-passed. When the proper key is inserted, the pins form a shearline allowing the plug of the lock to be turned. ![]() Varied in length and tapered at one end allows them to sit in the "v" cuts made in keys. The bit has cuts to bypass the wards or operate levers in the correct lock.īit Key Lock : A warded or lever lock that uses bit keys.īitting : A cut, or series of cuts, on the bit or blade of a key.īlade : The portion of the key that is inserted into the lock.īlank : A key before any cuts have been made.īolt : The part which is moved into a locked or unlocked position.īottom Pin (tumblers) : Cylinder pins usually made of brass used in setting combinations pin tumbler cylinders. Backplate : A plate on the inside of a door through which the cylinder connecting screws and tailpiece is passed.īackset : The horizontal distance from the edge of a door to the center of a lockset.īarrel Key : A key with a bit projecting from a hollow cylindrical shaft.īicentric Cylinder : A lock cylinder, usually of the pin tumbler type, that has two plugs and two sets of pin chambers instead of one.īi-Lock : A pin tumber cylinder lock consisting of two parallel rows of pin tumblers and two sidebars operated by a U shaped key.īit Key : A key with a bit projecting from a solid cylindrical shaft.
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