4mm x 20mm Pozi Countersunk Screw for Hard Plastics (PT45) - PZ2 Drive | A2 Stainless Steel
| Quantity |
Unit Price
(ex. VAT)
|
Unit Price
(inc. VAT)
|
|---|---|---|
| 1 - 49 | £0.75 | £0.90 |
| 50 - 99 | £0.45 | £0.54 |
| 100 - 249 | £0.30 | £0.36 |
| 250 - 499 | £0.23 | £0.27 |
| 500 - 999 | £0.19 | £0.23 |
| 1000 - 4999 | £0.15 | £0.18 |
| 5000 + | £0.12 | £0.14 |
£0.90 / each
.png)
Product Specification
| Thread Size | 4.0mm |
| Thread Length | 20mm |
| Material | A2 Stainless Steel |
| Head Diameter | 7.35mm |
| Head Height | 1.90mm |
| Drive | PZ2 |
| Head Style | Countersunk |
Frequently Bought Together
Total Price: £0.00
4mm x 20mm Pozi Countersunk PT45 Screw for Hard Plastics | A2 Stainless Steel
Where plastic assemblies exposed to moisture require a specialist plastic fastener, this 4mm x 20mm Pozi Countersunk PT45 Screw uses a trilobular 45° thread and A2 Stainless Steel construction. The flush head style is suited to assemblies where protruding screw heads are undesirable.
What Are Pozi Countersunk PT45 Screws?
PT45 Pozi Countersunk Screws use a three-lobed thread body that concentrates forming pressure around three points of the pilot hole. This geometry allows the screw to form a mating thread in harder plastics while the head can finish level with the surrounding component surface.
Common Applications
- Electrical Enclosures: Secures hard-plastic covers and panels where a countersunk surface finish is required.
- Appliance Housings: Provides a dedicated fastening method for rigid plastic covers and moulded appliance parts.
- Control Equipment: Fastens hard-plastic panels and housings used around sensors, switches and control systems.
- Polycarbonate Housings: Forms a secure thread in suitable polycarbonate covers and housings while allowing a flush head finish.
4mm x 20mm Pozi Countersunk PT45 Screw Dimensions
- Thread Size: 4.0mm
- Thread Length: 20mm
- Head Diameter: 7.35mm
- Head Height: 1.90mm
- Drive: PZ2
- Material: A2 Stainless Steel
- Head Style: Countersunk
Key Benefits
- 45° trilobular PT45 thread form is designed for harder plastics and reinforced materials.
- PT45 geometry provides a strong drive-to-strip ratio for compatible hard-plastic assemblies.
- Correct pilot-hole diameter, boss size and countersink geometry should be selected for the material being assembled.
- Countersunk head allows a flush finished surface when installed into a correctly prepared recess.
Further PT45 sizes are available through the Pozi Countersunk Screws for Hard Plastics range. Read our Engineering Guide to Screws for Plastic for practical information on hard-plastic pilot holes, boss geometry and thread selection. For assistance selecting a screw, contact our technical sales team on 01233 713581.
Fri 8.30 am - 3.30 pm