5/16"-18 x 1-1/2" 18-8 Stainless Steel Coarse Thread Carriage Bolts

Diameter: 5/16"
Length: 1-1/2"
Material: Stainless Steel
Head Style: Carriage
Thread Size: 18 (Coarse)
Thread Length: Full
Hardness: 18-8
Type: Carriage Bolt
Square-Depth: 3/16"

Box of 8.

A carriage bolt has a domed or countersunk head, and the shank is topped by a short square section under the head. The square section grips into the part being fixed (typically wood), preventing the bolt from turning when the nut is tightened.