SOCKET HEAD CAP SCREWS UNF S/COLOUR 1936-1960
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Socket Head Cap Screws are also known as SHCS, Allen screw or Allen bolt, or simply a cap screw. Conforming to ASME / ANSI B18.3 1986, BS 2470 the contact surfaces of this screw or bolt are protected from external damage. Class Fit 3A Hardness RC38/43. Generally manufactured with a partial thread beyond a certain length and nominal diameter combination, but occasionally some stock may include a fully threaded shank at the same combination.