This Carriage Bolt are used in wood connections utilizing the square neck under the round head which will sit into the hole to prevent the head from turning. SKU: 40222243 MFG: 240078 Shop more products by Hillman Fasteners. We offer lowest price on Nuts, Bolts, Screws & Fasteners. With Life and Home you always get the best deals SHARE Share on Facebook Tweet on Twitter Share on Google+ Pin on Pinterest Free shipping over $35 $18.99 Quantity In Stock Add to cart Request a Bulk Quote Thank you for your quote request. We will be in touch. DETAILS Description DESCRIPTION Highlights: 5/16"-18 x 1" Round head Square neck Coarse thread Zinc plated steel Grade 2 FEATURES MFR: 240078 SKU: 40222243 UPC: 008236086669 Brand: Hillman Fasteners