Carriage bolts come with a round head and a square neck. These are largely used in wood connections. The neck’s square shape aids in placing the round head well into the wood hole, thus preventing bolt head from turning. Carriage bolts do not usually show high strength mainly because they are largely used with wood. And, they are often delivered under the standard specification ASTM A307.

Manufacturing

BBI manufactures carriage bolts with a diameter of 1/2″ – 1-1/4″. These bolts fulfill most specifications of the ASTM, SAE and AASHTO. In fact, we can even create special tooling to help produce nonstandard carriage bolts, bolt heads, or head dimensions larger than 1 inch diameter with your company’s name and/or logo.