Galvanised Coach Bolts – Cup Square Hex

Galvanised Coach Bolts Cup Square Hex Carriage Bolts for external applications. A heavy duty bolt with a mushroom domed shaped head often referred to as carriage bolts or cup square head.

Available to buy online in all lengths including extra long sizes. Supplied in mild steel and high tensile steel depending on size and finished in zinc or galvanised. A range of Stainless Steel is also available in A2, A4, duplex stainless, Silicone bronze upon request.

Galvanised coach bolts for external use in timber connections, wooden boats, timber frames, oak beams, glulam structures, heavy duty fencing, play parks etc.

Galvanised Coach Bolt Sizes


If you cannot find the length you require, please make an enquiry to our team about potentially sourcing that for you. Some of the Coach Bolts come fully threaded so please ask if this is important.

We also stock Galvanised Nyloc Nuts to suit the galvanised coach bolts.

The galvanised nylocs have oversized threads to fit the thicker coating of the galv.

Standard dimensions as per the following for M20. This can vary due to different manufacturers including thread lengths.

For more information on these products please contact the Swiftfix team.

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