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This Standard covers overall dimensions, tolerances, ratings, testing, and markings for factory-made wrought buttwelding fittings in sizes NPS 1â??2 through NPS 48 (DN 15 through DN 1200).

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This Standard covers general and dimensional data pertinent to the various types of screw and captive washer assemblies, otherwise known as sems, which are recognized as an American National Standard. (The word sems is a generic term applicable to screw and washer assemblies.)

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This Standard covers the complete general, dimensional, mechanical, and performance requirements (proof load, prevailing torque, and torque-tension) for carbon steel, inch series nylon insert locknuts of grades N2, N5, and N8 in styles NE (1/4 in. to 11/2 in.), NTE (1/4 in. to 11/2 in.), NU (1/4 in. to 3 in.), NTU (1/4 in. to 3 in.), NM (#2 to #12), NTM (#2 to #12), and hex flange (1/4 in. to 3/4 in.). This Standard also includes all-metal hex (#4 to 11/2 in.) and hex flange (1/4 in. to 3/4 in.) locking nuts of grades A, B, C, F, and G. These nut designs are designated as American National Standards.

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