• High-low thread pattern grips soft uPVC firmly and resists pull-out
• Self-tapping point cuts its own thread, so no pre-tapping needed
• Countersunk head sits flush with the frame or hardware plate
• Phillips (PH) recess for quick, positive driving by hand or drill
• Zinc plated (BZP silver) finish for corrosion resistance on interior work
• Made for frames with no steel or aluminium reinforcement present
• Small window-trade gauge that suits hinges, keeps, locks and handles

Built for the window trade, these screws handle the everyday jobs of fitting and repairing plastic frames:

• Fixing hinges to uPVC window and door frames
• Mounting locks, keeps and shootbolt receivers
• Attaching handles and espagnolette gearboxes
• Fitting trickle vents and weather bars
• General uPVC fabrication where there's no metal reinforcement to screw into

• Brand: TIMCO
• Material: Carbon steel
• Finish: Zinc & Yellow (ZYP gold)
• Head type: Countersunk with ribs
• Recess: Phillips
• Thread: High-low self-tapping
• Substrate: Unreinforced uPVC frames
• Use: Window and door fabrication, flush finish
• Pack: Box

What are window fabrication screws?

They're self-tapping screws made for building and repairing uPVC windows and doors. The point and thread cut into plastic frames, letting you fix hardware like hinges, locks and handles without pre-drilling a threaded hole.

What does a high-low thread mean?

A high-low thread alternates a tall thread with a shorter one between it. The taller thread digs deep into soft uPVC for grip, while the low thread adds holding power. Together they resist the screw working loose over time.

Can I use these where the frame has no steel reinforcement?

Yes. That's exactly what they're for. They bite into the plastic itself, so they hold hardware securely in frames where there's no steel or aluminium reinforcement behind the face.

What drive do they take?

A Phillips (PH) recess. Match your driver bit to the screw size for a firm fit and to avoid chewing out the head.

What size screws should I use for uPVC windows?

Pick a length that reaches through the hardware plate and into the frame wall without punching out the far side. These come in a range of window-trade lengths, so check the product options and match to your job.

Are these screws corrosion resistant?

The zinc plating gives good corrosion resistance for interior fabrication and repair work on windows and doors.