The Schletter 943208-120 is a stainless steel wafer-head wood screw, sized 8 x 120mm, designed for fixing Schletter roof hooks securely into timber roof substructures. It is a genuine Schletter Group fixing component, manufactured to the same quality standard as the company's wider PV mounting system range.
The screw features a flat wafer head with a TX40 Torx drive, a full-length coarse thread, and a sharp lead-in point for driving directly into timber rafters or battens without the need for pre-drilling in most cases. Manufactured from stainless steel, it is intended for long-term outdoor exposure as part of a pitched-roof solar mounting installation.
Key Features
Stainless Steel Construction
Manufactured from A2 grade stainless steel for strong, long-term corrosion resistance in exposed roof-space and outdoor conditions.
Wafer Head Design
The flat wafer head sits flush against the roof hook or fixing point, spreading load evenly without protruding excessively.
TX40 Torx Drive
A TX40 (T40) internal Torx drive provides secure bit engagement and reduces cam-out during high-torque driving.
Full-Length Coarse Thread
A coarse, full-length thread (116mm of the 120mm shank) maximises grip and pull-out resistance in timber.
Sharp Point, No Pre-Drilling
A sharp-pointed tip allows direct driving into most timber substructures, speeding up installation on site.
Roof Hook Compatibility
Designed for use with Schletter roof hooks across the company's pitched-roof mounting ranges, ensuring a matched, warranty-compliant fixing.
Good to Know: For roofs without sarking/boarding, Schletter recommends a minimum screw length of 80mm into the rafter. For roofs with sarking board and counter-battens, a minimum length of 120mm is recommended to achieve adequate penetration into the structural timber below the boarding. Always confirm embedment depth against the project's structural calculation.
Technical Specifications
General
Product Type
Wood screw, wafer head, for roof hook fixing
Article Number
943208-120
Dimensions
Head Style
Flat wafer head (non-countersunk)
Drive & Thread
Drive Type
Internal Torx (TX)
Thread Type
Coarse, full-thread
Point Type
Sharp, self-starting
Material & Finish
Surface Finish
Untreated (bare stainless)
Application
Recommended Use
Fixing Schletter roof hooks into timber roof substructures
Minimum Depth – Unboarded Roof
80 mm into rafter
Minimum Depth – Boarded Roof with Counter-Battens
120 mm into structural timber
Matching Seal Washer (Optional)
Schletter 119016-000, sold separately
Please Note: This screw is discontinued by the manufacturer and may only be available while existing stock lasts. Confirm current availability before specifying on new installations.
Frequently Asked Questions
What is the Schletter 943208-120 screw used for?
It is a stainless steel wafer-head wood screw used to fix Schletter roof hooks into the timber substructure of a pitched roof as part of a solar PV mounting installation.
What size driver bit do I need?
The screw uses an internal Torx TX40 drive, so a T40 Torx bit is required to install it.
Do I need to pre-drill before fitting this screw?
The sharp point and coarse thread are designed to allow direct driving into most timber substructures without pre-drilling, though pilot holes may still be advisable in dense or hard timber.
How deep should the screw go into the roof timber?
Schletter recommends a minimum of 80mm penetration into the rafter on unboarded roofs, and a minimum of 120mm on roofs with sarking boards and counter-battens, so the screw reaches solid structural timber.
Is a sealing washer needed with this screw?
A matching seal washer (Schletter 119016-000) is available separately and can be fitted where additional weatherproofing at the fixing point is required.
Is this screw still available to order?
This item has been discontinued by the manufacturer. It may still be available from stock while supplies last, so availability should be confirmed before specifying it for new projects.
