BI-METAL-ruuvi poranterällä/siipillä
The BFHSD Bi-Metal screw is designed for timber to steel joist (1.2–2.4 mm steel thickness) applications. The winged design cuts a clearance hole and avoids sheet ride. The Bi-metal design consists of 316 stainless steel and a carbon steel tip which is perfect for steel joist applications without compromising on corrosion resistance.
Pre-drilling and countersink may be necessary at ends, butt joints, and on applications where denser material is used. Follow board manufacturers recommendations where applicable.