KKZ A2 screws from Rothoblaas are countersunk cylindrical head screws with a double thread and special tip for use on hardwoods.
The larger diameter right-hand under-head thread ensures an effective grip, guaranteeing good coupling of the wooden elements. Concealed head.
Rothoblaas supplies a version in antique-burnished stainless steel, ideal to guarantee superb camouflaging in the wood.
Fields of Use
Outdoor use in highly aggressive environments. Wooden boards with density of < 780 kg/m3 (without pre-drill) and < 1240 kg/m3 (with pre-drill). WPC boards (with pre-drill). Suitable for service classes 1-2-3.
The special tip with sword-shaped geometry specially designed to efficiently drill very high-density woods without pre-drill (with pre-drill, over 1000 kg/m3). Tested on very high-density woods, such as IPE, massaranduba or bamboo Microllam® (over 1000 kg/m3).