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Stainless steel screw for COBRA® aluminium joists

A 316 stainless steel screw for aluminum joists without pre-drilling!

No predrilling
AISI316 stainless steel
All you need to know
  • 316 stainless steel screws
  • Compatible with salted areas
  • No need for pre-drilling
  • Perforates wood and aluminium
  • Narrow head


316 stainless steel
5.5x40 mm
5.5x50 mm
Screw head
Torx T20
Self drilling tip
Aluminium wall drilling up to 3 mm thick

Fixing on aluminium structure

The Cobra® self drilling screw allows a fixing of hardwood or use class 4 wooden decking boards on the aluminum joists.

Made of A4 stainless steel, they are ideal for highly exposed environments such as sea side places. No pre-drilling required for this screw neither in aluminum nor in wood thanks to its self drilling tip.

Also suitable for wooden joists.

Available in 5.5x40 mm and 5.5x50mm

Two screw sizes depending on boards thickness

Screw size

Board thickness

M5.5x40 mm

20-22 mm

M5.5x50 mm

22-28 mm

Depending on the thickness of the decking boards, use screws M5.5x40 mm or M5.5x50 mm.

Composition of the Stainless Steel Screw for Joists

1 - TORX Deep Head
Allows optimal power transmission
Secure screwdriving, no risk of twisting

2 - Special thread
Threading for aluminium joist

3 - Material / Surface
The screw is made of stainless steel A4 with an appropriate tip to ensure excellent penetration in wood

316 stainless steel resists corrosion of seawater and acids

Installation precautions

The screwing must be done at an average speed.
Board thickness: 20 to 28 mm thick.

Technical documents

  • Product sheet – Screws for alu joists COBRA.pdf
  • COBRA-CATA2021-GB.pdf

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