BHMA A156-115:2006 pdf download.AMERICAN NATIONAL STANDARD FOR HARDWARE PREPARATION IN STEEL DOORS AND STEEL FRAMES
1. SCOPE AND PURPOSE
1.1 This Standard covers all significant dimensional attributes for mounting common hardware products in steel doors and frames. All dimensions shall be as shown on the accompanying drawings.
1.2 This standard was developed to show only the most commonly used preparations for door hardware, and provide targets for standardization. Where multiple configurations are in common usage, separate drawings are provided. For other configurations, it is recognized that these standards may be used in part, or with exceptions, while still providing some degree of basic guidance and standardization.
4. DEFINITIONS
4.1 Auxiliary Dead Latch A plunger which, when actuated, automatically locks a projected latch bolt against return by end pressure.
4.2 Auxiliary Locks A lock having a latch bolt or dead bolt operated by a key or a turn or both. This lock is often used in addition to another lock which is or is not key operated but has a latch bolt operated by knobs,levers or thumbpiece.
4.2.1 Bored Dead Latch A lock ftting round bored openings in the face and edge of a door and having a dead latch operated by a key or turn or both.
4.2.2 Bored Dead Lock A lock ftting round bored openings in the face and edge of a door and having a dead bolt operated by a key or turn or both.
4.3 Bored Locks Bored lock is used herein to designate locks having cylindrical shaped bodies which are mounted in holes bored in the door.
4.4 Dead Bolt A lock component which protrudes from, or is withdrawn into the lock front by action of the lock mechanism. When the door is closed and the dead bolt is thrown, it extends into a hole provided in the strike, locking the door and does not return with end pressure.
4.5 Door Edge The two vertical surfaces of the door that are perpendicular to the door face.
4.5.1 Beveled Edged Door The angle of the lock or hinge edge of the door in relation to the face of the door. The standard bevel is 1/8 inch in 2 inches, or approximately 3 degrees.
4.12 Interconnected Lock A mechanically interconnected locking mechanism having a separate latch bolt or dead locking latch bolt and dead bolt designed for installation in round bored openings in the edge and face of a door.
4.13 Latch Bolt A lock component having a beveled end which projects from the lock front in its extended position, but is forced back into the lock case by end pressure or drawn back by action of the lock mechanism. When the door is closed, the latch bolt projects into a hole provided in the strike, holding the door in a closed position.BHMA A156-115 pdf download.