Unifix Grade 10.9 Socket Csk Head Screws - Grey

Grade 10.9 refers to the mechanical properties of the steel, indicating a high tensile strength suitable for heavy-duty structural and mechanical fastening.

They feature a bright zinc-plated finish which provides excellent corrosion resistance for general use, though they are not considered stainless steel.

While they are intended for metal applications, they can be used in wood if the material is properly pre-drilled and countersunk.

These screws require a standard hex key (Allen key) or a corresponding hex drive bit that matches the internal socket size.

Yes, they are manufactured to meet DIN 7991 standards for socket countersunk screws.

This specific variant is supplied in a box of 50.

Verify that the material is correctly countersunk to the proper depth and angle according to DIN 7991 specifications.

Ensure the hex key or driver bit is fully inserted into the socket and is not worn; apply consistent downward pressure while turning.

Check that the hole is properly tapped and free of debris or burrs before starting the screw.