M8 x 60mm Coach Bolt (Carriage Bolt) & Nut, BZP, Grade 4.8 Steel, DIN 603

M8 Coach Bolt

Coach bolt with a smooth head, no drive recess for security, and a square neck beneath the head that prevents rotation when tightened from the back.

The square neck under the head locks into wood or metal, preventing rotation during installation, which allows easy one-sided fastening.

Supplied with the correct nut and a smooth round head that allows for a clean finish. A head with no drive recess restricts the bolt from being removed or tampered with without clear access to the back.

This adds an element of security to applications where disassembly should be restricted and sees these coach bolts widely used.

Manufactured from 4.8 mild steel with a bright zinc plating for medium resistance to corrosion and used by both DIY enthusiasts and professionals alike across many sectors.

Known in the trade as carriage bolts, coach bolts, and cup square carriage bolts.

M8 Coach Bolt Specification

• Diameter (TD): M8 - 8mm
• Neck width (NW): 8.58mm max
• Neck depth (ND): 5.60mm max
• Length (L): 60mm
• Head width (HW): 20.65mm max
• Dome head height (HH): 4.88mm max
• Thread Pitch: 1.25mm
• Material: Mild steel
• Finish: (BZP) Bright zinc plated
• Supplied with the correct nut
  

The M8 coach bolt is part of a larger range of coach bolts (carriage bolts) available at competitive prices with bulk price discounts.

Coach bolts (carriage bolts) with increased corrosion resistance!

Do you need Coach bolts (carriage bolts) with increased resistance to corrosion? If so, take a look at the range of A2 stainless steel M8 x 60mm coach bolts (carriage bolts).

FAQs about Coach Bolt (Carriage Bolt)

Where are cup square carriage bolts commonly used?

These bolts are most commonly used to fix wood to wood or wood to metal structures such as decks, garden furniture, timber frames, fencing, and structural joinery. The square neck, below the head, locks into the material and prevents the bolt from spinning when tightened.

How does the square neck benefit installation?

The square neck under the domed head bites into timber or a square hole, providing anti-rotation while tightening the nut. This means you often don’t need a tool on the bolt head as the square neck holds the bolt in place, making assembly easier. 

Can I use this bolt without a pre-drilled hole?

Manufactured with a flat end, these bolts need a predrilled hole through the material that matches the M8 diameter.

What nut and washer should I use with this bolt?

This carriage bolt comes with a hexagon nut, which is designed to match the thread. You can add washers under the nut to evenly distribute the load and reduce surface pressure on the material.

Can these Coach Bolts be used outdoors?

These Coach Bolts are manufactured in a Grade 4.8 Steel, with a BZP plating and as such are not ideal for long term external use. If long term external use is required, stainless steel Coach Bolts are advised.

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