ANSI/BHMA Standards For Residential Grade Hardware

Product grades are defined by performance benchmarks, with Grade 1 being the highest level of performance.


In addition, there are specific tests for a Grade 1 lock including the Abusive Locked Lever Test where the outside lock lever shall be subjected to torque of 1,000 pounds inches. After torque is applied, failure shall occur if access is gained – a reason for Grade one lever locks to be equipped with through bolting.

All keyed cylinders used in these locks shall be of the pin tumbler type and shall have five or more pin tumbler cavities. The keyways shall have longitudinal ribs. Modification of these requirements to provide greater security is permitted.

There are two parts of Standard ANSI/BHMA A156.5-2001. The first part establishes requirements for auxiliary bored and mortise locks, rim locks, cylinders and push button mechanisms. Part two establishes requirements for indexed key control systems. This standard includes definitions, dimensional characteristics, component designs, illustrations, type numbers, descriptions and tests (including equipment requirements and procedures).

Tests and required results for A156.5-2001 include operational, finish, security and cylinder requirements. Product grades are defined by progressive performance benchmarks in the given tests, with Grade 1 being the highest level of performance.

The ANSI/BHMA A156.12-2005 Standard establishes performance requirements for Interconnected Locks and includes operational tests, strength tests, security tests, cycle tests, finish tests and dimensional criteria.

An example of the tests performed is the Axial Load Test. The standard is intended to test strength of the trim attachment to the door. With the door blocked, dynamometer load is applied to the outside lever or knob, along the lock axis perpendicular to the face of the door. The test is repeated to the inside lever or knob.

A Grade 1 interconnected Lock is 500 lbf , a Grade 2 is 300 lbf and a Grade 3 is 250 lbf.

The Standard ANSI/BHMA A156.13-2002 establishes requirements for Mortise Locks and Latches and includes definitions, general information, dimensional criteria and tests (equipment requirements and procedures).

Product grades are defined by progressive performance benchmarks in the given tests, with Grade 1 being the highest level of performance.

For example, in the Cylinder Tension Test for a Grade 1 mortise lock must be able to withstand 3,600 lbf, as compared to a Grade 3, which requires 1,000 lbf.

For more information on Builders Hardware Manufacturers Association (BHMA), go to Web Site: www.buildershardware.com

For more information on American National Standards Institute (ANSI), go to Web Site: www.ansi.org

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