Bi-Metal Screws
Bi-Metal Wafer Head Self-Drilling Screw
SS316 + SS420 wafer head Phillips screw with ceramic coating, 5.5 × 40 mm standard, for aluminium-to-steel joints.
5.5 × 40 mmSS316
Coastal facade and aluminium cladding
A4 stainless and bi-metal fixings for facades within a few kilometres of salt water.
- Architectural facadessector
- South America & Mediterraneanregion
- 4screw types
- Samplesfor site tests
The challenge
Chloride-laden air attacks zinc coatings within months and pits 304 stainless. The facade mixes aluminium panels, steel sub-frames and concrete.
Our fastening solution
- SS316 bi-metal wafer and pan head screws for aluminium profiles to steel.
- Solid SS316 self-drilling screws where only aluminium is drilled.
- Stainless bi-metal concrete screw anchors for brackets into the slab edge.
- Isolation washers between dissimilar metals.
Specification summary
| Profile fixing | Bi-metal SS316 wafer head 5.5 × 25 mm |
|---|---|
| Aluminium-only | SS316 hex washer 4.8 × 19 mm |
| Brackets to concrete | SS316 screw anchor 10 × 80 mm |
| Documentation | MTC + salt spray report |
Products used
Screws in this specification
Self-Drilling Screws
SS316 (A4) Hex Washer Head Self-Drilling Screw
Marine-grade 316 stainless hex washer head screw to DIN 7504K, 20–100 mm, for thin steel and aluminium near the sea.
DIN 7504 K#10–#14
Concrete & Masonry Screws
Stainless Bi-Metal Concrete Screw Anchor
SS304/SS316 + SS420 bi-metal screw-in bolt with hex head, metric and inch, for wet and outdoor concrete.
DIN6–14 mm
Concrete & Masonry Screws
Bi-Metal Concrete Screw, Indented Hex Washer Head
SS316 + SS420 concrete screw, indented hex washer head with serrations, ceramic coated 500/1,000 h, 5.5 × 40 mm.
5.5 × 40 mm standardSS316
More projects
Other applications
Rooftop solar on trapezoidal metal roofs
Fixing aluminium PV rails and clamps to steel roof sheet so the fixings outlast a 25-year panel warranty.
Steel warehouse with sandwich panel roof and walls
Long self-drilling screws for 100–150 mm insulated panels on hot-rolled purlins in a hot, dusty climate.
Commercial drywall fit-out on steel studs
Collated and loose screws for partitions and ceilings where speed and consistent countersinking drive the schedule.
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