M12x120 Cup Square Hex Coach Bolts Zinc Plated (Pack of 1)
Part No: M12-120CB-Z
Excl VAT: £0.38
M12x120 Cup Square Hex Coach Bolts Zinc Plated [Incl. Nuts & Washers](Pack of 5)
Part No: FM12-120CB-Z5
Excl VAT: £3.17
M12x120 Cup Square Hex Coach Bolts Zinc Plated (Pack of 10)
Part No: HX12-120CB-Z
Excl VAT: £4.27
M12x120 Cup Square Hex Coach Bolts Zinc Plated (Pack of 25)*
Part No: FM12-120CB-Z
Excl VAT: £9.34
Used mainly for fastening timber to timber and is extensively used for timber joist construction in house building and numerous decking applications.
A carriage bolt, also known s a coach bolt or as a 'cup square hex bolt', 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.
Zinc 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. Zinc oxide is a fine white dust that (in contrast to iron oxide) does not trigger a breakdown of the substrates surface integrity as it is formed. The zinc oxide, 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|
|Bolt Finish||Zinc Plated|
|Material Grade||4.6 Mild Steel|
|Bolt Specification||DIN 603/1218|