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Exterior Self-Drilling Screws for Heavy Section Steel
Exterior self-drilling screws for heavy section steel up to 12mm. Corrosion-resistant and built for external use.
Timco Heavy Section Self-Drilling Screws – Hex – EPDM Washer – Exterior – 5.5mm x 38mm – Box of 100
In stock
£8.33 ex VAT(£9.99 inc VAT)
SKU:
H38W16B
Timco Heavy Section Self-Drilling Screws – Hex – Exterior – 5.5mm x 80mm – Box of 100
In stock
£13.16 ex VAT(£15.79 inc VAT)
SKU:
H80B
Timco Heavy Section Self-Drilling Screws – Hex – Exterior – 5.5mm x 65mm – Box of 100
In stock
£10.41 ex VAT(£12.49 inc VAT)
SKU:
H65B
Timco Heavy Section Self-Drilling Screws – Hex – EPDM Washer – Zinc – 5.5mm x 38mm – Box of 100
In stock
£8.74 ex VAT(£10.49 inc VAT)
SKU:
H38W16BB
Timco Heavy Section Self-Drilling Screws – Hex – EPDM Washer – Exterior – 5.5mm x 80mm – Box of 100
In stock
£16.16 ex VAT(£19.39 inc VAT)
SKU:
H80W16B
Timco Heavy Section Self-Drilling Screws – Hex – EPDM Washer – Exterior – 5.5mm x 65mm – Box of 100
In stock
£11.83 ex VAT(£14.19 inc VAT)
SKU:
H65W16B
Timco Heavy Section Self-Drilling Screws – Hex – EPDM Washer – Exterior – 5.5mm x 55mm – Box of 100
In stock
£10.83 ex VAT(£12.99 inc VAT)
SKU:
H55W16B
Timco Heavy Section Self-Drilling Screws – Hex – Exterior – 5.5mm x 55mm – Box of 100
Out of stock
£9.41 ex VAT(£11.29 inc VAT)
SKU:
H55B
Timco Heavy Section Self-Drilling Screws – Hex – Exterior – 5.5mm x 38mm – Box of 100
In stock
£7.08 ex VAT(£8.49 inc VAT)
SKU:
H38B
Timco Heavy Section Self-Drilling Screws – Hex – EPDM Washer – Exterior – 5.5mm x 32mm – Box of 100
In stock
£7.58 ex VAT(£9.09 inc VAT)
SKU:
H32W16B
Timco Heavy Section Self-Drilling Screws – Hex – Exterior – 5.5mm x 32mm – Box of 100
In stock
£6.41 ex VAT(£7.69 inc VAT)
SKU:
H32B
Timco Heavy Section Self-Drilling Screws – Hex – EPDM Washer – Exterior – 5.5mm x 100mm – Box of 100
In stock
£21.83 ex VAT(£26.19 inc VAT)
SKU:
H100W16B
Timco Heavy Section Self-Drilling Screws – Hex – Exterior – 5.5mm x 100mm – Box of 100
In stock
£19.74 ex VAT(£23.69 inc VAT)
SKU:
H100B
What are exterior self-drilling screws?
Exterior self-drilling screws are designed to drill and fasten into thick steel in one operation. The self-drilling point allows them to penetrate heavy gauge steel without the need for pre-drilling, saving time on site.
These screws feature a durable exterior coating that provides corrosion resistance and helps protect against harsh weather conditions.
Why choose exterior self-drilling screws?
- Designed for steel up to 12mm thick
- No pre-drilling required, saving installation time
- Exterior coating resists over 500 hours salt spray
- Strong, reliable fixing for structural applications
- Available with or without sealing washers
With or without EPDM washer – which should you choose?
| Type | Best For |
|---|---|
| With EPDM Washer | External applications where a watertight seal is required, such as roofing and cladding |
| Without Washer | General metal-to-metal fixing where sealing is not required |
Available Sizes & Options
| Size | Type | Typical Use |
|---|---|---|
| 5.5 x 32mm | Standard / With EPDM Washer | Light metal-to-metal fixing where minimal penetration is required |
| 5.5 x 38mm | Standard / With EPDM Washer | General fixing into heavy section steel |
| 5.5 x 55mm | Standard / With EPDM Washer | Fixing thicker materials or layered steel sections |
| 5.5 x 65mm | Standard / With EPDM Washer | Deeper penetration for thicker steel or multi-layer applications |
| 5.5 x 80mm | Standard / With EPDM Washer | Heavy-duty fixing where extended reach is required |
| 5.5 x 100mm | Standard / With EPDM Washer | Long reach fixing through thicker materials into steel |
Designed for heavy section steel
These screws are designed for fixing into heavy section steel up to 12mm thick. The self-drilling point cuts efficiently into steel, while the partially threaded design helps improve clamping performance during installation.
Shop Exterior Self-Drilling Screws
Browse our range of exterior self-drilling screws for heavy section steel, suitable for construction, roofing, cladding, and fabrication applications.
Exterior Self-Drilling Screws FAQs
What are exterior self-drilling screws?
These screws are designed to drill into steel without pre-drilling and feature a protective coating for external use.
Can these screws be used on thick steel?
Yes, they are designed for heavy section steel up to 12mm thick.
Do I need a washer?
Use a screw with an EPDM washer when a watertight seal is required. For general fixing, a washer may not be necessary.
What does the exterior coating do?
The coating provides corrosion resistance and helps protect the screw in outdoor and exposed environments.
