Bi-Metal® Stainless Steel TEK® Screws
The complete Bi-Metal® range of stainless steel self-drilling TEK® screws —
a hardened carbon steel drill point welded to an A2 or A4 stainless steel body, giving the drilling performance of carbon steel with the corrosion resistance of stainless.
Filter by stainless grade, application, drill point, steel thickness and size below, with stock available from our UK and Netherlands warehouses.
Where Bi-Metal Screws Are Used
Coastal, Marine & Extreme Environments
Within a few miles of the coast, salt-laden air destroys standard coated fasteners years before the cladding itself fails. A4 (316) grade bi-metal hex head and washered screws fix roof and wall sheeting to light or heavy section steel with a service life to match the building envelope — including stitching screws for side-laps and flashings. For the harshest conditions — splash zones, de-icing chemical exposure and aggressive industrial atmospheres — selected hex head patterns are available in A8 super-duplex stainless steel, offering corrosion resistance beyond even 316 grade.
Composite & Insulated Panels
Stainless composite panel fasteners secure sandwich panels from 80mm up to 300mm to light section, heavy section and structural steel supports, with 12mm, 16mm and 19mm sealing washer options. A2 for standard external work; A4 and SuperTEK® versions for coastal and heavy structural applications.
Timber to Steel
Bi-metal wing drill screws fix timber battens, boards and ply through to steel with a flush countersunk finish — the wings ream the timber, then shear off at the steel so the hardened point can drill through. Gash point versions handle deep timber embedment.
Framing, Flush Finish & Aluminium
Low profile dome and pancake head bi-metal screws give a flush finish behind boards for framing and rail connections, while dedicated stainless self-tapping screws fasten into aluminium and thin metals without the risk of galvanic corrosion.