Stainless Steel Countersunk Timber to Light Section

For fixing timber to cold rolled purlins (1.5mm – 5.0mm steel).


This standard anti-corrosion coating ensures our fasteners can withstand over 500 hours in a salt spray test. It is a specialist epoxy zinc and aluminium compound which produces a multi layered, scratch resistant coating.  Countersunk heads lie flush with the surface of the substrate. They generally have a torx drive.

Part Number Length (MM) Diameter (MM) Drill Point Min Timber Thickness (MM) Max Timber Thickness (MM)
45.3SST 45 4.8 No. 3 10 30
65.3SST 65 5.5 No. 3 35 50

Timber screws fasten timber to cold rolled purlins (1.5mm – 5.0mm steel).

  • Stainless steel provides excellent corrosion-resistance which increases the life-span of the fixing.
  • Countersunk heads lie flush with the profile, and require T-25 bits.
  • The coarse thread provides excellent engagement with the purlin, maximising pull-out values.
  • The wings bore through the timber and keep the thread clean, before snapping off when they connect with the steelwork.
  • The no. 3 drill point is designed to maximise accuracy whilst ensuring a clean cut through up to 5.0mm steel, without burn-out.

For maximum fastener performance, we recommend using a tek screw driver which does not exceed 2500RPM.




45.3SST 65.3SST
A (mm) 10.00 10.70
B (mm) 45.00 65.00
C (mm) 37.00 57.00
D (mm) 4.80 5.50
E (mm) 8.00 8.00
F (mm) 4.30 4.75

Click to download Technical Data Sheet

45.3SST   ⭳ 65.3SST   ⭳
Pull Out (kN) - 2.00mm S275 Steel 3.14 3.14
Shear (kN) 8.05 9.33
Tensile (kN) 5.10 13.58




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