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Coach Bolts - M8x75 - Pack of 50 - Silver

Coach Bolts - M8x75 - Pack of 50 - Silver

Pack of 50 coach bolts with steel nuts, cup square head, M8 x 75mm. These bolts are suitable for g...

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50x Coach Bolts with Steel Nuts, Cup Square Head - Metric - M8x75 - HCB4

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B&QB&Q - Coach Bolts And Nuts M8 X 75 Zinc Plated Steel Bs 4933 Part Thread Pack Of 50 Pairs
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Product Information

Full details

This guide is for engineers, builders, and DIY enthusiasts requiring reliable fastening solutions. The Mehr Coach Bolts offer a secure and durable connection for general maintenance and construction projects, providing excellent value in a pack of 50. While versatile, they are specifically designed for general use and may not be suitable for extreme load-bearing applications without further engineering consideration.

All features

ColourSilver
Model Part NumberHCB4
BrandMehr

Extended Product Information

FAQs

What does M8 x 75mm mean?

M8 refers to the metric thread diameter of 8 millimeters. 75mm refers to the length of the bolt from the underside of the head to the tip.

What is a cup square head bolt used for?

A cup square head bolt, also known as a coach bolt, is used for fastening timber to timber, or timber to metal. The square section under the head jams into the wood when tightened, preventing the bolt from turning.

Are these bolts suitable for outdoor use?

The bolts are zinc-plated steel, which offers basic protection against corrosion. They are suitable for general outdoor use in dry conditions but may rust over time in prolonged exposure to moisture. For harsher environments, stainless steel options are recommended.

How many bolts and nuts are in this pack?

This pack contains 50 pairs of coach bolts and nuts.

What standard do these bolts comply with?

These coach bolts comply with the BS 4933 standard.

Can I use these for structural load-bearing applications?

While strong for general use, these bolts are intended for general maintenance and construction. For critical structural applications, it is advisable to consult an engineer to ensure the appropriate type and grade of fastener is used.

Troubleshooting

Bolt spins when tightening the nut

Ensure the square recess for the cup square head is adequately formed and deep enough for the head to engage properly. Re-drill or enlarge the recess if necessary.

Nut is difficult to thread onto the bolt

Check for any debris or damage on the bolt threads. Clean the threads with a wire brush if necessary. Ensure you are using the correct M8 nut.

Bolt head doesn't sit flush

Verify the clearance hole diameter is correct for the bolt shaft. The square recess should accommodate the head without protruding excessively.

Pros and Cons

Pros

  • Cost-effective bulk pack of 50 bolts and nuts.
  • Durable construction suitable for general engineering and maintenance.
  • Cup square head prevents rotation during tightening.
  • Zinc plating offers basic corrosion resistance.
  • Meets BS 4933 standards for quality assurance.

Cons

  • May not be suitable for heavy-duty or critical structural applications.
  • Zinc plating can wear off over time with extensive exposure to moisture.
  • Not designed for specialized applications requiring specific materials or coatings.

Setup, Compatibility & Care Instructions

Setup:

  1. Select Appropriate Hole Size: Drill a clearance hole for the M8 bolt shaft through the materials you are joining.
  2. Create Square Recess: For the cup square head to function correctly, create a square recess (slightly larger than the head) in the material where the bolt head will sit. This prevents rotation.
  3. Insert Bolt: Pass the bolt through the aligned materials.
  4. Attach Nut: Screw the accompanying M8 steel nut onto the threaded end of the bolt.
  5. Tighten: Use appropriate wrenches or spanners to tighten the nut securely. Ensure the bolt head is held in place by the square recess.

Compatibility:

  • These bolts are designed to be used with standard M8 nuts.
  • They are suitable for joining wood, plastic, and certain metal components where the material can accommodate the bolt head and nut.
  • Ensure the material thickness is compatible with the 75mm bolt length.

Care:

  • To maintain corrosion resistance, keep the bolts clean and dry. Wipe with a dry cloth if they become soiled.
  • For extended outdoor use or in high-moisture environments, consider applying a protective coating or using stainless steel alternatives if rust becomes a concern.

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