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B&Q£24.94Visit shop B&Q - Coach Bolts & Nuts M8 X 60 Zinc Plated Din 603 Cup Head Pack Of 50 Pairs
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This guide is for professionals and DIY enthusiasts needing reliable M8 x 60mm fasteners. The key benefit is the robust, zinc-plated steel construction offering excellent durability and corrosion resistance for various applications. A potential caveat is that the 'Pack of 50 Pairs' means 50 bolts and 50 nuts, which might be more than a small project requires, necessitating careful inventory management. These coach bolts feature a cup square head, ideal for secure fastening where the bolt head needs to be flush and protected. The pack contains 50 pairs, providing ample supply for medium to large projects.
| Colour | Silver |
|---|---|
| Model Part Number | HCS21 |
| Brand | Mehr |
It means the pack contains 50 coach bolts and 50 corresponding M8 nuts.
DIN 603 is a German Industrial Standard that specifies the dimensions and requirements for coach bolts, including the cup square head design.
Grade 4.8 refers to the mechanical properties of the steel, indicating a minimum tensile strength of 400 MPa and a yield strength of 320 MPa. It's suitable for general engineering applications.
Yes, the zinc plating provides good resistance to corrosion for outdoor use. However, for highly exposed or marine environments, stainless steel might be a more durable option long-term.
Typically, for an M8 bolt, a clearance hole of 8.4mm to 9.0mm is recommended. For the cup square head, you might want to create a slightly larger recess for it to sit flush, depending on the material.
The product description specifies 'Coach Bolts and Nuts M8 x 60 Pack of 50 Pairs'. Washers are not explicitly mentioned as included, so it is advisable to purchase M8 washers separately if needed for your application.
The approximate weight of the pack is 1.6kg.
Ensure the square neck of the bolt head is properly seated in a pre-drilled recess or against a firm surface. If fastening through soft material, the neck may not engage sufficiently. Consider using a washer on the bolt head side or a slightly larger hole if necessary to allow for better seating of the cup head.
Check for any damage to the bolt threads or the nut threads. Debris or cross-threading can prevent smooth engagement. Clean the threads or try a different nut if available. Ensure you are using the correct M8 nut.
Verify the total thickness of the materials being joined. This M8 x 60mm bolt is suitable for materials totaling approximately 20-45mm in thickness, allowing for nut engagement. If a different length is required, consider other Mehr coach bolt variants.
While zinc-plated steel offers good protection, it is not immune to corrosion in aggressive environments. For critical applications, consider using stainless steel bolts. For existing bolts, clean the corroded area and apply a suitable metal protectant or paint.
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