1/2"-13 x 8-1/2" Zinc Grade 2 / A307 Carriage Bolts (22 pcs.)

Diameter: 1/2"
Length: 8-1/2"
Material: Steel
Finish: Zinc
Head Style: Carriage
Thread Size: 13 (Coarse)
Thread Length: Partial
Hardness: Grade 2 / A307
Type: Carriage Bolt
Square-Depth: 9/32"

Box of 22.

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.