5/8"-18 x 4-1/2" Zinc Plated Grade 8 Steel Fine Thread Hex Cap Screws

Diameter: 5/8"
Length: 4-1/2"
Material: Steel
Finish: Yellow Zinc
Head Style: Hex (15/16" Wrench)
Thread Size: 18 (Fine)
Thread Length: 1-3/4"
Hardness: Grade 8
Type: Cap Screw

Box of 10.

A hex cap screw has a hexagonal head, designed to be driven by a wrench.