uPVC Window Frame Screws

About uPVC Window Frame Screws

uPVC window frame screws — typically 3.9mm diameter self-tapping pan head screws — are essential for fixing beads, attaching hardware and securing frames during window installation. Glazing Supplies Direct stocks the full range of sizes used in UK residential and commercial window installations including 3.9×13mm, 3.9×19mm and 3.9×25mm.

All screws are BZP (bright zinc plated) for corrosion resistance and supplied in trade packs. Bulk quantities are available at reduced per-unit pricing. Next-day delivery when ordered before 3 pm.

Frequently Asked Questions

What size screws are used for uPVC window frames?

The most common sizes for uPVC window installation are 3.9×13mm (for bead fixing and hardware), 3.9×19mm and 3.9×25mm (for frame joints and fixing screws). 4.8mm screws are used for heavier fixing applications.

Are your uPVC frame screws self-tapping?

Yes — all our uPVC window frame screws are self-tapping and do not require a pre-drilled pilot hole in standard uPVC profiles.

What drive type do your uPVC screws use?

Our uPVC frame screws are available in Pozi (PZ2) and Phillips drive. PZ2 is the most widely used for window installation in the UK.