M20 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.
Our stock in M20 ranges in lengths from 100mm to 400mm, 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.
M20 Galvanised 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 lengths up to 125mm long has a thread of 46mm, 125mm up to 200mm long has a thread of 52mm, 200mm Plus has a thread of 65mm.
Some of the Coach Bolts come fully threaded please ask if this is important.
For more information on this product please contact the Swiftfix team.