Screws
Premium Wafer Head Baypole Tek Screws for UPVC Windows
20% off applied
Overview
When building or reinforcing UPVC bay and curved window frames, a secure, flush and rattle-free fixing into the frame's internal aluminium or steel reinforcement is essential. These self-drilling Baypole tek screws, "Baypole" being the standard UK fenestration-trade term for this type of UPVC window-frame fixing screw, are made for exactly that job. The hardened drilling point cuts its own pilot hole through the UPVC profile and into the metal reinforcement behind it in a single pass, so there is no need to pre-drill before fixing.
The low-profile wafer head is designed to sit flush against the frame once driven home, so it doesn't foul window mechanisms, trims or blind fittings once installed, a useful detail on bay and curved frame assemblies, where clearances around moving parts and beading are often tight. A zinc-plated finish gives the screws a good baseline level of corrosion resistance against the damp conditions typical of UK window installations, and the self-tapping thread is cut to bite firmly into thin-gauge metal reinforcement, giving strong pull-out resistance and a tight, non-rattling joint once fully seated. A Phillips drive keeps the fixing straightforward with a standard driver bit.
Stocked in ten size combinations across two diameters: 4.2mm (commonly sold as gauge 8) and 4.8mm (gauge 10), with lengths from 13mm up to 80mm, there is a Baypole screw here to suit the vast majority of bay window, sill and reinforcement-fixing jobs a fenestration installer or window fitter will come across, from lighter frame-to-frame fixing through to heavier-duty reinforcement work.
Key Features
- Self-drilling point: cuts its own pilot hole through UPVC and into aluminium or steel window reinforcement without pre-drilling, saving time on site.
- Low-profile wafer head: sits flush against the frame surface once driven home for a neat finish that stays clear of window hardware and trims.
- Self-tapping thread: bites into thin-gauge metal reinforcement for a strong, secure, rattle-free fixing.
- Zinc-plated finish: corrosion-resistant coating suited to the damp conditions typical of UK window installations.
- Phillips drive: compatible with standard Phillips driver bits for quick, consistent driving.
- Two diameters for two duty levels: 4.2mm (gauge 8) for lighter frame fixing, 4.8mm (gauge 10) for heavier bay and reinforcement work.
- Wide length range: 13mm to 80mm across ten sizes, covering the full range of UPVC profile and reinforcement depths.
- Single-pass fixing: drills and taps its own thread in one operation rather than needing a separate pre-drilling step.
Specification
| Specification | Detail |
|---|---|
| Type | Self-drilling, self-tapping Baypole (window frame fixing) screw |
| Head style | Wafer head (low-profile) |
| Point type | Self-drilling (tek) point |
| Drive type | Phillips |
| Thread | Self-tapping |
| Diameters | 4.2mm (~0.165" / gauge 8) and 4.8mm (~0.189" / gauge 10) |
| Lengths | 13mm to 80mm (~0.51" to 3.15"), 10 sizes; see table below |
| Material | Steel |
| Finish | Zinc-plated |
| Typical application | UPVC window frames, fixing into aluminium or mild steel reinforcement up to approx. 3mm thick |
Available Sizes
| Diameter | Length (metric) | Length / gauge (imperial) |
|---|---|---|
| 4.2mm | 13mm | 8g x 1/2" |
| 4.2mm | 16mm | 8g x 5/8" |
| 4.2mm | 19mm | 8g x 3/4" |
| 4.2mm | 25mm | 8g x 1" |
| 4.2mm | 32mm | 8g x 1 1/4" |
| 4.2mm | 40mm | 8g x 1 5/8" |
| 4.8mm | 50mm | 10g x 2" |
| 4.8mm | 60mm | 10g x 2 3/8" |
| 4.8mm | 70mm | 10g x 2 3/4" |
| 4.8mm | 80mm | 10g x 3 1/8" |
Typical Applications
Baypole tek screws are the standard fixing used across UPVC bay and curved window frame assembly and reinforcement work, wherever a screw needs to pass cleanly through a UPVC profile and bite securely into the aluminium or mild steel reinforcement running through it. Common jobs include:
- Assembling and reinforcing bay and curved (bow) window frames, where several frame sections need to be drawn together tight and flush against the internal reinforcement.
- Fixing sill sections and joining frame components where a rattle-free, flush-headed fixing is needed close to window mechanisms, trims and beading.
- General fenestration reinforcement fixing into aluminium or mild steel reinforcement bar up to approximately 3mm thick, as commonly found running through UPVC window profiles.
- Lighter-duty frame-to-frame and trim fixing, using the shorter 4.2mm (gauge 8) sizes from 13mm to 40mm where only shallow reinforcement penetration is needed.
- Heavier-duty bay window and reinforcement fixing through thicker profile sections, using the longer 4.8mm (gauge 10) sizes from 50mm to 80mm.
Trade-quality Baypole tek screws for professional fenestration installers and experienced tradespeople alike.
Installation Guidance
For the best results and to protect the UPVC profile:
- Use a matched Phillips driver bit seated square in the head to avoid cam-out and a stripped drive recess.
- Let the screw do the cutting. Use a moderate, steady drill speed appropriate for self-drilling screws rather than forcing the tip; excessive pressure can burn out the point or cause the screw to wander off-centre.
- Clamp profiles together before fixing so they can't jack apart as the thread engages the reinforcement behind the first material.
- Stop as soon as the head sits flush. Continuing to drive after the head seats can crush the UPVC profile or strip the thread in the thin metal reinforcement.
Order before 2pm Mon–Fri for same-day dispatch from our UK warehouse.
Specifications
| Material | Steel |
|---|---|
| Finish | Bright Zinc Plated (BZP) |
| Size | 4.2mm & 4.8mm diameter, 13mm-80mm length (10 sizes) |
| Weight | 0.0016 kg |
All 50 options and prices
| Size | Pack Quantity | Price inc. VAT | ex. VAT | Per piece | Select |
|---|---|---|---|---|---|
| 4.2mm x 13mm ( 8 x 1/2" ) | 10 | £4.48 | £3.73 | £0.45 | |
| 4.2mm x 13mm ( 8 x 1/2" ) | 50 | £5.18 | £4.31 | £0.10 | |
| 4.2mm x 13mm ( 8 x 1/2" ) | 100 | £6.58 | £5.48 | £0.07 | |
| 4.2mm x 13mm ( 8 x 1/2" ) | 200 | £7.68 | £6.40 | £0.04 | |
| 4.2mm x 13mm ( 8 x 1/2" ) | 500 | £11.18 | £9.31 | £0.02 | |
| 4.2mm x 16mm ( 8 x 5/8" ) | 10 | £4.48 | £3.73 | £0.45 | |
| 4.2mm x 16mm ( 8 x 5/8" ) | 50 | £5.18 | £4.31 | £0.10 | |
| 4.2mm x 16mm ( 8 x 5/8" ) | 100 | £6.38 | £5.31 | £0.06 | |
| 4.2mm x 16mm ( 8 x 5/8" ) | 200 | £7.38 | £6.15 | £0.04 | |
| 4.2mm x 16mm ( 8 x 5/8" ) | 500 | £10.38 | £8.65 | £0.02 | |
| 4.2mm x 19mm ( 8 x 3/4" ) | 10 | £4.48 | £3.73 | £0.45 | |
| 4.2mm x 19mm ( 8 x 3/4" ) | 50 | £6.18 | £5.15 | £0.12 | |
| 4.2mm x 19mm ( 8 x 3/4" ) | 100 | £6.98 | £5.81 | £0.07 | |
| 4.2mm x 19mm ( 8 x 3/4" ) | 200 | £8.68 | £7.23 | £0.04 | |
| 4.2mm x 19mm ( 8 x 3/4" ) | 500 | £14.28 | £11.90 | £0.03 | |
| 4.2mm x 25mm ( 8 x 1" ) | 10 | £4.58 | £3.81 | £0.46 | |
| 4.2mm x 25mm ( 8 x 1" ) | 50 | £6.48 | £5.40 | £0.13 | |
| 4.2mm x 25mm ( 8 x 1" ) | 100 | £7.58 | £6.31 | £0.08 | |
| 4.2mm x 25mm ( 8 x 1" ) | 200 | £9.78 | £8.15 | £0.05 | |
| 4.2mm x 25mm ( 8 x 1" ) | 500 | £18.68 | £15.57 | £0.04 | |
| 4.2mm x 32mm ( 8 x 1 1/4" ) | 10 | £4.58 | £3.81 | £0.46 | |
| 4.2mm x 32mm ( 8 x 1 1/4" ) | 50 | £6.28 | £5.23 | £0.13 | |
| 4.2mm x 32mm ( 8 x 1 1/4" ) | 100 | £7.18 | £5.98 | £0.07 | |
| 4.2mm x 32mm ( 8 x 1 1/4" ) | 200 | £8.98 | £7.48 | £0.04 | |
| 4.2mm x 32mm ( 8 x 1 1/4" ) | 500 | £16.88 | £14.07 | £0.03 | |
| 4.2mm x 40mm ( 8 x 1 5/8" ) | 10 | £4.58 | £3.81 | £0.46 | |
| 4.2mm x 40mm ( 8 x 1 5/8" ) | 50 | £6.48 | £5.40 | £0.13 | |
| 4.2mm x 40mm ( 8 x 1 5/8" ) | 100 | £7.58 | £6.31 | £0.08 | |
| 4.2mm x 40mm ( 8 x 1 5/8" ) | 200 | £9.78 | £8.15 | £0.05 | |
| 4.2mm x 40mm ( 8 x 1 5/8" ) | 500 | £18.68 | £15.57 | £0.04 | |
| 4.8mm x 50mm ( 10 x 2" ) | 10 | £4.78 | £3.98 | £0.48 | |
| 4.8mm x 50mm ( 10 x 2" ) | 50 | £7.28 | £6.07 | £0.15 | |
| 4.8mm x 50mm ( 10 x 2" ) | 100 | £9.18 | £7.65 | £0.09 | |
| 4.8mm x 50mm ( 10 x 2" ) | 200 | £15.38 | £12.82 | £0.08 | |
| 4.8mm x 50mm ( 10 x 2" ) | 500 | £26.78 | £22.31 | £0.05 | |
| 4.8mm x 60mm ( 10 x 2 3/8" ) | 10 | £4.78 | £3.98 | £0.48 | |
| 4.8mm x 60mm ( 10 x 2 3/8" ) | 50 | £7.48 | £6.23 | £0.15 | |
| 4.8mm x 60mm ( 10 x 2 3/8" ) | 100 | £9.58 | £7.98 | £0.10 | |
| 4.8mm x 60mm ( 10 x 2 3/8" ) | 200 | £15.98 | £13.31 | £0.08 | |
| 4.8mm x 60mm ( 10 x 2 3/8" ) | 500 | £28.58 | £23.81 | £0.06 | |
| 4.8mm x 70mm ( 10 x 2 3/4" ) | 10 | £4.88 | £4.07 | £0.49 | |
| 4.8mm x 70mm ( 10 x 2 3/4" ) | 50 | £8.28 | £6.90 | £0.17 | |
| 4.8mm x 70mm ( 10 x 2 3/4" ) | 100 | £13.58 | £11.31 | £0.14 | |
| 4.8mm x 70mm ( 10 x 2 3/4" ) | 200 | £19.48 | £16.23 | £0.10 | |
| 4.8mm x 70mm ( 10 x 2 3/4" ) | 500 | £36.98 | £30.81 | £0.07 | |
| 4.8mm x 80mm ( 10 x 3 1/8" ) | 10 | £5.68 | £4.73 | £0.57 | |
| 4.8mm x 80mm ( 10 x 3 1/8" ) | 50 | £8.78 | £7.31 | £0.18 | |
| 4.8mm x 80mm ( 10 x 3 1/8" ) | 100 | £14.48 | £12.07 | £0.14 | |
| 4.8mm x 80mm ( 10 x 3 1/8" ) | 200 | £21.18 | £17.65 | £0.11 | |
| 4.8mm x 80mm ( 10 x 3 1/8" ) | 500 | £41.28 | £34.40 | £0.08 |
Delivery and returns
Free standard UK delivery, or Next Day Delivery for £0.99 (order by 2pm).
Order before 2pm Mon–Fri for same-day dispatch
60-day returns
Where to use it.
