M12x300 Cup Square Hex Coach Bolts Galvanised Bolt Only (Pack of 1)
Part No: M12-300CB-G
Excl VAT: £2.03
M12x300 Cup Square Hex Coach Bolts Galvanised [Incl. Nuts & Washers] (Pack of 5)
Part No: FM12-300CB-G5
Excl VAT: £10.50
M12x300 Cup Square Hex Coach Bolts Galvanised Bolt Only (Pack of 15)*
Part No: FM12-300CB-G
Excl VAT: £30.43
A carriage bolt, also known as coach bolt or as cup square hex bolts, has a domed head, and the shank is topped by a short square section under the head. The square section grips into the part being fixed (typically wood), preventing the bolt from turning when the nut is tightened. A rib neck carriage bolt has several longitudinal ribs instead of the square section, to grip into a metal part being fixed.
Galvanised coatings prevent oxidation of the protected metal to create a longer lasting finish. It does this by forming a barrier and by acting as a sacrificial anode if this barrier is damaged. Galvanise is a coating that (in contrast to iron oxide) does not trigger a breakdown of the substrates surface integrity as it is formed. The galvanise, if left intact, can act as a barrier to further oxidation, in a way similar to the protection afforded to aluminum and stainless steels by their oxide layers.
|Head Type||Cup Square Hex|
|Material Grade||4.6 Mild Steel|
|Bolt Specification||DIN 603/1238|