1/2"-20 x 4" Zinc Plated Grade 5 Steel Fine Thread Hex Cap Screws CSHS5-518

Diameter: 1/2"
Length: 4"
Material: Steel
Finish: Zinc
Head Style: Hex (3/4" Wrench)
Thread Size: 20 (Fine)
Thread Length: 1-1/4"
Hardness: Grade 5
Type: Cap Screw
A hex cap screw has a hexagonal head, designed to be driven by a wrench.