BHMA A156-40:2015 pdf download.AMERICAN NATIONAL STANDARD FOR RESIDENTIAL DEADBOLTS
SCOPE
1.1 ANSI/BHMA A156.40 establishes requirements for residential deadbolts and deadlatches, and includes durability, security, finish tests. Residential deadbolt and deadlatches are generally used for single family homes and multifamily dwellings.
1.2 Tests described in this Standard are performed under laboratory conditions. In actual usage, results vary because of installation, door and frame construction, maintenance and environmental conditions.
1.3 When locks and latches are used in fire door assemblies, they shall have been tested and listed for use in fire doors by a Nationally Recognized Testing Laboratory (NRTL) and shall be under an in-plant follow-up inspection service.
1.4 Residential Grade Qualifications Manufacturers shall indicate the Grade level of their locks for each of the three categories listed (Durability, Strength and Security, and Finish). Locks shall meet all tests for their grade listing for each of the categories independently. A Grade A lock for a specific category shall meet all Grade A criteria for that category, and a Grade B lock for a specific category shall meet all Grade B criteria for that category, and a Grade C lock for a specific category shall meet all Grade C criteria for that category.
2.3 Bolts
2.3.1 Auxiliary Dead Latch A plunger which, when actuated, automatically locks a projected latch bolt against return by end pressure.
2.3.2 Dead Bolt A lock component having an end, which protrudes from, or is withdrawn into, the lock front by action of the lock mechanism.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 thrown, it extends into a hole provided in the strike, locks the door, and does not retract with end pressure.
2.3.3 Latch Bolt A lock component having a beveled end which projects from the lock front in an 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, and holds the door in a closed position.
2.3.4 Deadlocking Latch Bolt A spring actuated latch bolt with a beveled end and incorporating a plunger which, when depressed, automatically locks the projected latch bolt against return by end pressure. Also called dead latch.
2.14 Mortise Dead Latch A lock ftting a mortised cavity prepared in the edge of a door and having a latch bolt and an auxiliary dead latch operated by a key or turn or both. The key or turn engage the lock through holes prepared in the faces of the door.BHMA A156-40 pdf download.