Carriage Bolts are recommended for use with Tufnut security hardware in all situations where the square neck is not a problem. The round head is difficult to grasp, while the square neck prevents the bolt from turning.
Our most popular sizes are listed here. We can supply them for you in all sizes if you cannot obtain them locally or from your Tufnut distributor.
Our Carriage Bolt Adapters can be used with any 5/16" or 3/8" carriage bolts to raise their neck off of the mounting surface.