5/8"-18 x 4" Zinc Plated Grade 8 Steel Fine Thread Hex Cap Screws HCS8-409

Diameter: 5/8"
Length: 4"
Material: Steel
Finish: Yellow Zinc
Head Style: Hex (15/16" Wrench)
Thread Size: 18 (Fine)
Thread Length: 1-1/2"
Hardness: Grade 8
Type: Cap Screw
A hex cap screw has a hexagonal head, designed to be driven by a wrench.