M20 Galvanised Coach Bolts – Cup Square Hex

M20 Galvanised Coach Bolts also known as Cup Square Hex or Carriage Bolts.

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


Available sizes in M20 Coach Bolts

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.

M20 Coach Bolts  (Cup Square Hex) to Din 603.

Thread M20 x 2.5mm Pitch – Head Diameter Min 45.2mm Max 46.8mm – Head Height Min 9.95mm Max 11.05mm
Thread Length for M20
up to 125mm long has a thread of 46mm thread
125mm up to 200mm long has a thread of 52mm thread
200mm Plus has a thread of 65mm thread.
Some of the Coach Bolts come fully threaded please ask if this is important.

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