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Coach Bolts

Coach bolts, also known as carriage bolts, are used mostly in wood and occasionally in composites and thin sheet metal. Their domed head makes them a low-profile and tamper-proof fastener, giving a neat and safe finish to a project. Our range includes zinc plated steel, galvanised steel and stainless steel.

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  • Coach Bolts & Nuts - Zinc Plated BZP
    DIN 603

    Coach Bolts & Nuts - Zinc Plated BZP

  • Coach Bolts - Galvanised (M8 - M12)

  • Coach Bolts & Nuts - Galvanised (M16 - M20)
    DIN 603

    Coach Bolts & Nuts - Galvanised (M16 - M20)

  • Coach Bolts - Stainless Steel A2
    DIN 603

    Coach Bolts - Stainless Steel A2

  • Coach Bolts - Stainless Steel A4

5 Item(s)

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Below the head of a coach bolt is a square shoulder which is driven into the substrate by hammering the dome head. This prevents the bolt from rotating, allowing a nut to be tightened on the thread. Tightening up the nut at this point can also draw the square deeper into the substrate, ensuring that the head is well seated. The nut is often used in conjunction with a Form C or Form G washer, as the greater surface area of these washers (compared to Form A) spreads the load over a greater area, which is advantageous when working with soft materials, such as wood.

Coach bolts are occasionally used in conjunction with shear nuts, which creates a strong, permanent fastening that is tamper-proof on both sides! In this application, it is advisable to use a standard hex nut to seat the bolt head properly, and then remove it and install the shear nut. Unless you are using stainless shear nuts, install the shear nuts on the side of the application that will not be exposed to moisture or use corrosion protection paint to prevent rust from occurring at the shear point.

Please note that galvanised coach bolts must only be used with galvanised nuts, which are tapped oversize to accommodate the thickness of the zinc coating.