How to Use Self Drilling TEK Screws: A Complete UK Contractor’s Guide
Self‑drilling TEK screws are a go‑to solution for fastening metal to metal or metal to timber in UK industrial, electrical, and HVAC installations. Whether you’re fixing cable trays, roofing sheets, or bracketry to steel framing, knowing how to use self drilling TEK screws correctly can save time, reduce installation errors, and ensure long-term performance.
What Are Self Drilling TEK Screws?
Self‑drilling TEK screws feature a built-in drill point that removes the need for pre‑drilling. They’re ideal for fixing into:
- Steel purlins or beams
- Timber battens
- Sheet metal
- Bracketry or Unistrut-style framing
They combine drilling, tapping, and fixing in one quick action—perfect for busy sites.
Top TEK Screw Products for UK Contractors
Here are three of the best-performing TEK screw products from our Self‑Tapping / Drilling Screws category—selected for reliability, quality, and application coverage:
1. TIMCO – 5.5 × 38 mm Heavy Duty Tech Screw with EPDM Washer
Highlights: Designed for heavy-duty steel fixing up to 12 mm thick, this screw combines a Ruspert-coated finish with a 16 mm EPDM washer for superior corrosion resistance and waterproof sealing.
- Finish: Silver Ruspert (rust-resistant)
- Tip: Self-drilling (No.5 TEK point)
- Use Cases: Cladding, steel framework, roofing installers
2. TIMCO – 4.2 × 13 mm Light Section Screws (Hex Head)
Highlights: Compact and efficient, these hex-head self‑drilling screws are ideal for thin steel or light-duty fastening—especially for cable tray supports and bracketry.
- Best For: Sheet metal up to 3 mm
- Pack Size: 1,000 screws – cost-efficient bulk option
3. TIMCO – 5.5 × 13 mm Wafer Head Screws
Highlights: Featuring a low-profile wafer head and coarse thread, ideal for electrical trunking or aesthetic metal fixtures.
- Wafer Head: Smooth underside for flush fixing
- Finish: Zinc-plated for indoor use
Step-by-Step: How to Use Self Drilling TEK Screws
- Choose the correct screw – Match the diameter, length, and tip to your material type.
- Select the proper bit – Use magnetic hex sockets or PH2 bits.
- Drill at medium speed – Let the TEK point cut through naturally.
- Hold steady and perpendicular – For a clean bite and straight fix.
- Stop at compression – Avoid overtightening to preserve the seal.
Product Comparison Table
| Product |
Size |
Head Type |
Use Case |
| Heavy Duty Tech Screw |
5.5×38 mm |
Hex + EPDM Washer |
Steel frameworks, cladding |
| Light Section Screw |
4.2×13 mm |
Hex Head |
Cable trays, brackets |
| Wafer Head Screw |
5.5×13 mm |
Wafer Head |
Trunking, flush finish |
Need Trade Support or Advice?
Explore our full TEK screw range: Shop TEK Screws Now
Call 0121 270 8507 or email sales@directchannel.uk.com for next-day delivery or technical support.
FAQs – Voice Search Ready
Q: What drill bit do I need for TEK screws?
A: Use a magnetic hex socket or PH2 bit, depending on screw head.
Q: Do I need a pilot hole?
A: No, TEK screws self-drill, tap, and fix in one step.
Q: Are TEK screws weatherproof?
A: Yes, especially if using stainless steel or those with EPDM washers.
