Why do carriage bolts have a square neck?

The simple answer is that carriage bolts, also known as coach bolts, feature a square neck directly beneath the domed head to provide a locking mechanism when installed.

This square section directly below the smooth domed head sits within a square recess within the material and prevents the bolt from rotating when tightened. The square neck embeds itself into the materials surface creating a secure hold.

The square neck is especially effective in wooden applications, where it bites into the material, ensuring the bolt remains stationary while the nut is tightened.

This feature makes carriage bolts / coach bolts an excellent choice for applications requiring a flush, tamper-resistant finish on one side, such as in fencing, decking, and furniture assembly.

Why use Fusion Fixings

Fusion Fixings is a family run business with over 40 years’ experience in the construction and fixings industry. The aim is to bring you an extensive range of fixings and fasteners at great prices.

Many products are held in stock ready to go, with quantities starting from just one, to as many as you need to get the job done.

The range of carriage bolts / coach bolts at Fusion Fixings is growing and take a look at the growing range of carriage bolts / coach bolts here.