Premium Quality Fixings from Glazing Supplies Direct

Professional-grade screws and fixings for window, door and glazing installation. Self-tapping, self-drilling — from window screws to timber-to-steel fasteners. Trade pack sizes.

Screws and fixings for installation

Professional-grade screws and fixings selected for window, door and glazing installation. Self-tapping window screws for uPVC profiles, waferhead screws for frame-to-frame connections, and timber-to-steel fasteners that drill through steel without pilot holes. All corrosion-resistant with trade pack sizes from 100 to 1,000.

How to choose the right fixing

For fixing beads, handles and hardware to uPVC, use self-tapping window screws (3.9 x 13mm) — they tap their own thread without splitting the plastic. For frame-to-frame connections, use waferhead screws (4.8 x 70mm) with low-profile heads that sit flush. For fixing timber to steel lintels or RSJs, use timber-to-steel screws (5.5 x 100mm) with winged CSK and No.3 drill tip that self-drills through steel up to 5mm thick.
Trade Tip

Trade tip: For external window fixings, always specify A2 or A4 stainless steel over BZP zinc-plated. BZP screws corrode behind UPVC profiles over time, causing staining and seal failure that is expensive to fix and voids most manufacturer warranties.

Frequently Asked Questions

What screws do I need for uPVC windows?

Self-tapping window screws (3.9 x 13mm) for beads, handles and hardware. They tap their own thread without pilot holes or splitting the plastic. For frame-to-subframe fixing, use longer frame fixings (70mm+).

Can timber-to-steel screws go through steel without pilot holes?

Yes — TechFast timber-to-steel screws have a No.3 drill tip that self-drills through steel up to 5mm thick. No pre-drilling required.

What is a waferhead screw?

A screw with a large, flat, low-profile head that sits almost flush. Used for frame-to-frame connections where a protruding head would interfere with glazing beads or sealed units.