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OnBuy.com£6.58Visit shop Black Countersunk Hex Socket Bolts Din 7991 Iso 10642 Grade 10.9 Allen Key Flat Head Screws M4 To M8 5056826614315
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B&Q£9.78Visit shop B&Q - M4 X 12mm Black Hex Socket Countersunk Bolts (Pack Of: 10) Din 7991 Flat Head Allen Screws
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These DIYUK Black Hex Socket Countersunk Bolts (M8 x 35mm) are designed for professionals, makers, and DIY enthusiasts seeking a secure and flush fastening solution. Their key benefit is providing a strong, corrosion-resistant hold with a clean, low-profile finish, ideal for projects where aesthetics matter. A caveat to note is the specific measurement method for countersunk bolts, which includes the head length.
| Colour | Black |
|---|---|
| Model Part Number | M8 x 35mm |
| Brand | DIYUK |
Countersunk bolts are measured by their total length, from the top surface of the flat head down to the very tip of the screw. This is different from cap head screws where length is measured from under the head.
Grade 10.9 indicates a high-strength property class for steel fasteners, signifying excellent tensile strength and durability suitable for structural and demanding applications.
The black oxide finish provides corrosion resistance, but for long-term outdoor use in harsh environments, stainless steel or specially coated fasteners might be more suitable. Ensure proper maintenance.
For an M8 Hex Socket Countersunk Bolt (DIN 7991), you will typically need a 6mm Allen key.
The black oxide finish primarily enhances corrosion resistance and provides a non-reflective, aesthetically pleasing dark finish to the fastener.
Yes, provided you have a countersink bit that matches the 90° angle specified by the DIN 7991 / ISO 10642 standards and the diameter of the bolt head.
Yes, as they are made from carbon steel, these bolts are magnetic.
Ensure the hole is properly countersunk to a 90° angle and matches the diameter of the bolt head. Verify you are using the correct bolt size for the application.
Confirm you are using the correct size hex key (typically 6mm for M8 bolts). Ensure the socket in the bolt head is clean and free from debris.
Check that the mating thread is secure and undamaged. Ensure you have tightened the bolt sufficiently, but avoid overtightening which can strip the threads or damage the bolt/material.
While black oxide offers resistance, it is not impervious. Clean the affected area with a soft cloth and consider applying a light protective oil (e.g., WD-40) if the item is stored in a humid environment.
Setup: To use these bolts, ensure you have a correctly sized hex (Allen) key. A pilot hole is required, and for the countersunk head to sit flush, the hole must be countersunk to a 90° angle. IMPORTANT: Measure the bolt's total length from the top of the flat head to the tip to confirm it fits your application, as this is the standard measurement for countersunk fasteners.
Compatibility: These bolts adhere to DIN 7991 / ISO 10642 standards, ensuring compatibility with M8 threaded holes and standard hex keys. They are compatible with various materials including wood, plastic, and metal, provided the appropriate pre-drilled and countersunk holes are made.
Care: To maintain the corrosion resistance of the black oxide finish, avoid prolonged exposure to harsh chemicals or extreme moisture. If cleaning is required, use a dry or slightly damp cloth. For more stubborn debris, a mild degreaser can be used, followed by drying thoroughly. Avoid abrasive cleaners that could damage the finish.
