5/8"-11 x 16" Galvanized Grade 2 / A307 Carriage Bolts (15 pcs.)

Diameter: 5/8"
Length: 16"
Material: Steel
Finish: Hot Dip Galvanized
Head Style: Carriage
Thread Size: 11 (Coarse)
Thread Length: Partial
Hardness: Grade 2 / A307
Type: Carriage Bolt
Square-Depth: 11/32"

Box of 15.

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.