Screws for Torx head connectors - Stainless steel

CSA-S connector screw is made from A4 marine grade stainless steel. It was developed for installing Simpson Strong-Tie stainless steel connectors to timber, in order to obtain the published load bearing capacities. The conical shape under the head ensures a full contact with the connector which increases the transfer of force. A fixed connection with larger cross-bearing capacity than for standard screws is obtained. The 6 lobe recess helps to fix the screw during insertion.


CE Marking
Service class 3
Acier inoxydable A4
Ambiance corrosive

Product Details


Connect timber battens.



  • A4 stainless steel


  • ETA approved (ETA-04/0013)
  • T-20 6 lobe drive
  • Conical shape under the head for secure fit in connector holes
  • Type 17 point to prevent splitting of timber
  • 250 screws per box


Suitable On

  • Supporting / Supported member: solid wood, composite lumber, glued-laminated wood.

Common Applications

Fixing stainless steel connectors to timber

  • Stainless steel joist hangers
  • Stainless steel angle brackets
  • Stainless steel straps

Technical Data


Product Dimensions

References Fastener Dimensions [mm] Characteristic capacities - Timber C24 acc to ETA-04/0013 [kN] Stocked in UK
l lg d1 d dh Characteristic Lateral Capacities Flat,k [kN] 
/ Material Thickness [kN]
Characteristic Axial Capacity Rax.k [kN]
1.2mm 1.5 to 2.0mm 2.5 to 4.0mm
CSA5.0X25S 25 19 3.15 4.85 8.3 1.5 1.5 1.5 1.4 Yes
CSA5.0X35S 35 29 3.15 4.85 8.3 2 2 1.9 2.1 Yes
CSA5.0X40S 40 34 3.15 4.85 8.3 2.3 2.3 2.2 2.5 Yes
Capacities are given for 2mm steel plate thickness and C24 timber. To determine the capacities for other steel thickness and / or timber grades, please refer to ETA-04/0013.  Performance values based upon timber density of 350 kg/m3

Characteristic Capacities

References Characteristic Capacities [kN]
Rax,k Rlat,k
CSA5.0X25S 1.38 1.49
CSA5.0X35S 2.11 1.99
CSA5.0X40S 2.47 2.25

Characteristic Capacities - used in timber C24

Rax = axial withdrawal capacity

Rlat = lateral capacity


Declaration of Performance (DoP)

European Technical Assessment (ETA)

CAD Library

No items available.
No items available.
No items available.
No items available.
No items available.
No items available.

Buy from Distributor

No items available.