Nylon Patch Socket Set Screws Cone Point, 5/16-18 x 1/2", Alloy Steel, Black Oxide, Hex Socket (Quantity: 100) Coarse Thread, Thread Diamater: 5/16 inch x Length: 1/2 inch

Designed for Permanent Setting on soft or hardened shafts | Deep penetration gives this style of screw the highest torsional and axial holding power | Can be used as a hangar or pivot. For shafts of Rockwell hardness C15 or more, spot point half its depth | Recommended Hex Socket (Allen Wrench) Size: 5/32 (Inch) | Black Oxide is not a protective finish and will rust if exposed to moisture. Stainless Steel material is recommended for environments with moisture