Carriage Bolts & Hex Nuts M6 x 40mm Zinc Plated – Box of 200

M6 x 40mm carriage bolts with hex nuts, bright zinc plated, in a trade box of 200. Also known as coach bolts or cup square bolts, they have a smooth domed head and a square neck that bites into the timber so the bolt cannot spin as the nut is tightened.

The go-to bolt for clamping timber to timber and fixing gate hinges, brackets and ironmongery where a neat, tamper-resistant head is wanted on the face side.

Key features

• Domed head with square anti-spin neck
• Hex nuts included
• Neat, tamper-resistant face side
• Bright zinc plated carbon steel
• Head markings visible on dome

Specification

Packaging may vary from the image shown. Supplied as specified.

Applications

Timber-to-timber joints, gates and gate hinges, fencing, sheds, decking frames, playground equipment and ironmongery to timber. Bright zinc plating is for internal or sheltered use.

FAQs

What size hole do I drill for an M6 carriage bolt?

Drill a 6mm clearance hole through the timber, then tap the bolt through so the square neck seats in the wood before tightening the nut.

Should I use a washer?

Yes – fit a washer under the nut to spread the load and stop the nut pulling into the timber.

Carriage bolts or coach screws?

Carriage bolts pass right through both pieces and are clamped with a nut – the strongest option. Coach screws are used where you can only reach one side.

Are they suitable for outdoors?

Bright zinc plating gives light protection for internal or sheltered use. For exposed external work, choose galvanised or stainless bolts.

Other sizes and related products

Other sizes in this range: M6 x 100mm, M6 x 120mm, M6 x 150mm, M6 x 25mm, M6 x 30mm, M6 x 50mm, M6 x 60mm, M6 x 75mm.

Browse the full carriage bolts range, or see our nuts and washers.

Nationwide delivery across Ireland – free on orders over €100.