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| Image | Product + | Brand | Price | Availability | Qty |
| M12x230 Cup Square Hex Coach Bolts Zinc Plated [Incl. Nuts & Washers] (Pack of 5)Part No: FM12-230CB-Z5 | TIK Products |
£6.13 Excl VAT: £5.11 | Out Of Stock | |
| M12x230 Cup Square Hex Coach Bolts Zinc Plated (Pack of 10)Part No: HX12-230CB-Z | HX Fixings |
£8.62 Excl VAT: £7.18 | 3 Days | |
| M12x230 Cup Square Hex Coach Bolts Zinc Plated (Pack of 25)*Part No: FM12-230CB-Z | Fixings Megastore |
£24.34 Excl VAT: £20.28 | Out Of Stock |
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.
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.
| Fastener Specifications | |
| Head Type | Cup Square Hex |
| Bolt Diameter | 12mm |
| Fixing Length | 230mm |
| Thread Length | 100mm |
| Thread Type | Metric |
| Thread Pitch | 1.75mm |
| Bolt Finish | Zinc Plated |
| Material Grade | 4.6 Mild Steel |
| Bolt Specification | DIN 603/1232 |