5/16"-18 x 2-1/2" Zinc Plated Grade 5 Steel Coarse Thread Hex Washer Head Serrated Flange Bolts

Diameter: 5/16"
Length: 2-1/2"
Material: Steel
Finish: Zinc
Head Style: Hex Washer (1/2" Wrench)
Thread Size: 18 (Coarse)
Thread Length: 1" to 2"
Hardness: Grade 5
Style: Serrated
Type: Flange Bolt

Box of 5.

A flange bolt has a wide flange beneath the hex head of the bolt. Applied with a wrench.