Timber screws for trade
How to choose the right timber screw
Trade tip: For hardwood window and door frames, choose a self-tapping screw with a fine thread pitch. Coarse softwood threads can strip in hardwood, reducing pull-out strength. Pre-drilling at 70% of the screw shank diameter gives a cleaner drive and better holding power.
Frequently Asked Questions
Do I need to pre-drill?
Not in most softwoods — the self-drilling tip cuts its own thread cleanly. For hardwoods (oak, ash) or very close to the edge of a workpiece, a pilot hole prevents splitting.
What is the difference between Torx and Pozi drive?
Torx (star-shaped) provides higher torque transfer and virtually eliminates cam-out, making it better for power driving long screws. Pozi (cross-head) is more common but more prone to cam-out under high torque.
What coating should I choose?
Zinc yellow (ZY) is suitable for indoor and sheltered outdoor use. For fully exposed outdoor fixings (decking, fencing), choose stainless steel or an outdoor-rated coating.