5/16 -18 x 1/2 Zinc Grade 2 / A307 Hex Bolts HBHS-152 (100 pcs)

Diameter: 5/16 Length: 1/2 Material: Steel Finish: Zinc Head Style: Hex (1/2 Wrench) Thread Size: 18 (Coarse) Thread Length: 1/2 Hardness: Grade 2 / A307 Type: Cap Screw Box of 100. A hex cap screw has a hexagonal head designed to be driven by a wrench.