5/16"-18 x 3-1/2" Zinc Plated Grade 5 Steel Coarse Thread Hex Cap Screws CSHS5-182

Diameter: 5/16"
Length: 3-1/2"
Material: Steel
Finish: Zinc
Head Style: Hex (1/2" Wrench)
Thread Size: 18 (Coarse)
Thread Length: 7/8"
Hardness: Grade 5
Type: Cap Screw
A hex cap screw has a hexagonal head, designed to be driven by a wrench.