BHMA A156-2:2017 pdf download.BORED AND PREASSEMBLED LOCKS AND LATCHES
1.1 BHMA A156-2 establishes performance requirements for bored and preassembled locks and latches,and includes dimensional criteria, operational tests, strength tests, cycle tests, security tests, material evaluation tests, and finish tests.
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.
3.1 Cylinders Cylinders supplied or mated with locks shall meet the performance requirements for the appropriate cylinder types and grade level found in the ANSI/BHMA Standard A156.5-2014 for Cylinders and Input Devices for the lock to retain its grade listing. Assemblies take the grade level of the lowest graded component. Other mechanisms are permitted to be used in lieu of cylinders providing the performance and security criteria are equivalent to that of cylinders. Suffix D shall be indicated in the certified products directory for locks to be used only with drill resistance cylinders as evaluated in A156.5.
3.2 No lock can provide complete security by itself. Locks may be defeated by forcible or technical means, or evaded by entry elsewhere on the property. No lock can substitute for caution, awareness of your environment, and common sense. Builders hardware is available in multiple performance grades to suit the application. In order to enhance security and reduce risk, consult a qualified locksmith or other security professional. For applications where pick resistance and other higher security protections are required users should consider locks meeting UL 437 or ANSI/BHMA A156.30 for High Security Cylinders.
3.7 Door and Frame Preparation The lock models described in this standard shall fit the door and frame preparations described in the ANSIBHMA A156.115 Series. Other configurations are permitted to fit special opening templating requirements. See manufacturers' instructions for details.
3.8 Building Codes Certain lock functions described in this standard are not permitted on doors within a means of egress. Consult local authority having jurisdiction. 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.
3.9 Tolerances All values which do not carry specific tolerances or are not marked maximum or minimum shall have the following tolerances: Linear dimensions shall be±1/16 in. (1.6 mm). Weight or force shall be±2%. Angles shall be±2 degrees. Where only minus tolerances are given, the dimensions are permitted to be exceeded at the option of the manufacturers.BHMA A156-2 pdf download.