The KKT A4 from Rothoblaas is the wood screw designed for outdoor use in very aggressive environments. Ideal for fastening claddings for terraces and façades, it is also available in the KKT X version for fastening standard clips for wooden boards. The inverse (left-hand) under-head thread guarantees excellent grip. The small conical head ensures that it is well concealed in the wood. The three-lobed thread makes it possible to cut the wood grain during screwing, guaranteeing an exceptional wood penetration. In A4 austenitic stainless steel, it is also available in the KKT X version with reduced length, for fastening Rothoblaas TVM and TERRALOCK standard clips in outdoor environments. The KKT A4 and KKT X wood screws are suitable for use without pre-drilling on timber boards with a density of less than 550 kg/m3 and with pre-drilling on boards with a density of less than 880 kg/m3. Service classes 1, 2 and 3.
