Butt Hinge, also known as ANSI/BHMA A156.1 Butt Hinge, also known as ANSI/BHMA A156.1. ANSI 156.1, the American National Standard Institute (ANSI) This Standard specifies the requirements for butts and hinges. Included are cycle tests, lateral and vertical wear tests, friction tests, strength tests, finish tests, and material and dimension
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