ASME B 18.6.3 - 2013
Combination Slotted-Pan Head Screws
(ASTM F837, F468)
①,Carbon Steel - Unhardened. Unless otherwise specified, machine screw shall be non-heat-treated low carbon steel, such as 1006 through 1022, with a hardness of Rochwell B69-100 ②,Carbon Steel - Hardened. When hardened machine screws are specified, they shall be made form low or medium carbon steel, such as 1018 through 1038, with or without boron, through-hardened to Rockwell C25-38 |