Sealey Self Tapping Screw 4.8 x 16mm Flanged Head Black Pozi BS 4174 - Pack of 100 - BST4816

A Pozi drive is a type of screw head with crossed slots designed to accept a Pozi drive screwdriver or bit. This design provides improved grip and reduces the chance of the screwdriver slipping out (cam-out).

BS 4174 is a British Standard that specifies the requirements for self-tapping screws, ensuring a certain level of quality and performance.

While these screws are suitable for many applications, their black finish may not offer the best corrosion resistance. Consider using stainless steel screws for outdoor use.

Pilot hole size varies based on material. Consult a drill size chart for self-tapping screws and the specific material you're working with. Always pre-drill the pilot hole.

A flanged head provides a wider bearing surface, distributing pressure more evenly and helping to prevent the screw from sinking into the material. This creates a more secure and flush finish.

Yes, but it is critical to pre-drill a pilot hole of the appropriate size to prevent the screw from snapping or stripping the threads.

There are 100 screws in each pack.

Check the pilot hole size. It may be too small or the material may be too hard. Try a larger pilot hole or a different screw type.

Reduce the driving torque. Ensure the correct screwdriver bit is being used, and the pilot hole is the correct size.

Ensure the correct screw length is used for the application and the pilot hole is not too large.