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OnBuy.com£7.88Visit shop Black Countersunk Hex Socket Bolts Din 7991 Iso 10642 Grade 10.9 Allen Key Flat Head Screws M4 To M8 5056826614322
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B&Q£10.38Visit shop B&Q - M4 X 12mm Black Hex Socket Countersunk Bolts (Pack Of: 50) Din 7991 Flat Head Allen Screws
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This guide is for professionals, makers, and DIY enthusiasts seeking durable, flush-fitting fasteners. The key benefit is a secure hold with a clean, professional aesthetic for projects ranging from furniture assembly to automotive repairs. A crucial point to note is that these countersunk bolts are measured by their total length, including the head, requiring careful measurement for proper fit.
| Colour | Black |
|---|---|
| Model Part Number | DIN 7991 / ISO 10642 |
| Brand | DIYUK |
Unlike standard cap screws, countersunk screws like these are measured by their TOTAL length, from the top of the flat head to the very tip of the screw.
They are made from High Tensile Carbon Steel, specifically Grade 10.9, ensuring high strength and durability.
The black oxide finish provides a professional, stealthy look and offers good resistance to corrosion and wear.
You will need a Hex Socket (Allen key). For M5 size bolts, a 3mm Allen key is typically required.
While the black oxide finish offers some corrosion resistance, these bolts are best suited for indoor or protected outdoor applications. For harsh environments, stainless steel or coated alternatives might be more appropriate.
These bolts conform to DIN 7991 / ISO 10642 international standards.
Ensure the hole is correctly countersunk at a 90° angle to match the bolt head's angle. The material thickness should also allow the head to sit completely below the surface.
Ensure the hole is properly countersunk to a 90° angle. The material may be too hard to countersink effectively, or the countersink bit used was not the correct size/angle.
Verify you are using the correct size Allen key (typically 3mm for M5). Ensure the key is fully inserted into the socket. Inspect the bolt head for damage or defects.
The mating thread (nut or tapped hole) is stripped or damaged. Ensure the hole/nut is properly threaded for an M5 bolt.
The black oxide finish provides moderate corrosion resistance. For environments with high humidity or exposure to water, additional protective measures like oil or specialized coatings may be necessary.
Setup:
Compatibility:
Care:
