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Westfield Fasteners Ltd Telephone: 01844201133, Email: enquiries@westfieldfasteners.co.uk
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Tek Bolts

Self drilling screws, tek screws or tek bolts enable the assembler to quickly attach materials such as steel, aluminium, composites or timber to steel section, or similar, up to 35mm thickness without the need for any pre-drilling or thread tapping. Each screw features a special cutting tip and tapping thread the design of which varies depending on the material that is being screwed into.

Increasingly relied upon in modern construction projects where their speed and efficiency of use considerably reduce labour costs.

We offer the full range of high performance Evolution self drilling screws each of which are available in up to 4 material types. The Evoshield coating provides what we think as the best compromise between corrosion resistance and cost and is available on the majority of Evolution products.

Where a higher level of corrosion resistance is required the A2 or A4 bi-metal variant provides a stainless fastener with a high performance non-stainless cutting tip. Though costly, this option offers the best of both worlds: a stainless tek screw capable of drilling through depths of steel up to 12.5mm.

A lower cost zinc plated option is available where corrosion resistance is not a priority, such as for internal ducting and metal framing applications.

The standard DIN 7504 in different head types and materials, including stainless steel, are available for light duty applications where the high performance of the Evolution range is not required.

Fastener Material Key
Evoshield® - A special triple layered ceramic surface coating developed by Evolution to prevent corrosion in pollutive and atmospheric conditions.
A2 Stainless Steel - Also known as grade 304 or 18/8. A general purpose grade of stainless steel.
A4 Stainless Steel - Also known as grade 316 or 18/8/3. A higher corrosion resistant, marine grade of stainless steel.
Bright Zinc Plated (BZP) Steel - Non-stainless standard steel grade offering a basic level of corrosion resistance.


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