Forgefix TechFast Timber to Steel CSK/Wing Screws are used to join timber to steel frame buildings. The screws are fitted with breakaway wings that create a clearance hole to protect thread from engaging timber when drilling through. Breakaway wings will ream a hole, then break-off when they contact the metal surface to be drilled. The thread will then engage with metal. They have a TORX® compatible insert for a higher transmission of power. With improved countersinking from recessed ribs. Fire and corrosion resistant. Complies with EU Safety, Health and Environmental requirements. These Forgefix TechFast Timber to Steel CSK/Wing Screws have the following specification: Size: 5.5 x 135mm Clamping Thickness: 106mm Effective Thread Length: 107mm Pack Size: 50 Drill Tip: No.5 No.5 drill tip for self-drilling heavy gauge steel up to 12.5mm https://elecena.pl/product/27231626/forgefix-techfast-timber-to-steel-csk-wing-screw-no-5-tip-5-5-x-135mm-box-50 2024-11-11 https://elecena.pl/product/27231626/forgefix-techfast-timber-to-steel-csk-wing-screw-no-5-tip-5-5-x-135mm-box-50 2025-03-13 https://elecena.pl/product/27231626/forgefix-techfast-timber-to-steel-csk-wing-screw-no-5-tip-5-5-x-135mm-box-50 2026-05-05 https://elecena.pl/product/27231626/forgefix-techfast-timber-to-steel-csk-wing-screw-no-5-tip-5-5-x-135mm-box-50 2026-07-12