Crafted from austenitic stainless steel, Mex-Flat A4 screws offer the highest level of corrosion resistance, making them perfect for use in outdoor environments where exposure to moisture, salt, or tannin-rich woods is common. With their flat head and trilobular design, these screws ensure a seamless, clean installation for decking boards.

Best for: Tropical hardwoods, thermowood, and softwoods
Corrosion Resistance: Excellent, ideal for marine and saline environments
Key Applications: Decking, outdoor structures, and terraces

Description and Benefits of the Mex-Flat A4
Mex-Flat A4, made from austenitic stainless steel A4, is a screw specifically developed for fastening decking boards to wooden substructures.
The screw features a trilobular geometry, an extra reinforced shank, an additional driving thread, a Torx profile, and many other advantages.

Material Description – Stainless Steel A4:
Suitable for woods with high tannin content, such as Cumaru, Merbau, Bangkirai, etc., as well as for thermowood and softwoods.
Surface treatment by passivation increases corrosion protection
Suitable for saline environments
Acid-resistant under certain conditions
Can be used in service classes 1, 2, and 3 (ČSN EN 1995-1-1)
Suitable for chlorinated environments to a limited extent

Mex-Flat A4 is intended for:
Softwood species: Spruce, Siberian Larch, Silesian Larch, Cedar, Pine (with and without pressure treatment)
Thermowood: Thermowood Pine, Thermowood Ash, Thermowood Spruce
Hardwood species – with high tannin content: Bangkirai, Massaranduba, Dark Red Meranti - Bukit, Merbau, Garapa, Ipe, Teak, Cumaru, Oak

Size:
5.5x40 mm
5.5x50 mm
5.5x60 mm
5.5x70 mm

Torx: TX25

Packaging: 200 pcs + bit