BHMA A156-5:2001 pdf download.AMERICAN NATIONAL STANDARD FOR AUXILIARY LOCKS AND ASSOCIATED PRODUCTS
1. SCOPE PART 1
1.1 This portion of ANSI/BHMA A 156.5 establishes requirements for Auxiliary Bored and Mortise Locks,Rim Locks, Cylinders and Push Button Mechanisms and includes security tests, operational tests, finish tests,and dimensional criteria.
1.2 Tests described in this Standard are performed under laboratory conditions. In actual usage, results vary because of installation, maintenance and environmental conditions.
1.3 When locks and latches are used in fire door assemblies, they shall be 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 Grade Qualifications Three classifications of tests are described in this Standard, Operational, Finish and Security. Manufacturers shall indicate the Grade level of their locks. Locks shall meet all Operational Tests 9, Finish Tests 10, and Security Tests 11 for their grade listing. A Grade 1 lock shall meet all Grade 1 criteria, a Grade 2 lock shall meet all Grade 2 criteria, and a Grade 3 lock shall meet all Grade 3 criteria in each classification.
2. DEFINITIONS
2.1 Auxiliary Lock 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.
2.2 Backset The distance from the edge of the door measured at the centerline of the door thickness to the centerline of the function holes or cross bore.
2.3 Bolts
2.3.1 Auxiliary Dead Latch A plunger which, when actuated, automatically locks a projected latch bolt against returm 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2.3.2 Dead Bolt A lock component having an end, which protrudes from, or is withdrawn into, the lock front by action of the lock mechanism.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 returm by end pressure. Also called dead latch.BHMA A156-5 pdf download.