Screw type KEQ is made from carbon steel EN 10084 C15E-1.1141 with an approximate hardness between 160 and 180 HB. The lead accuracy class is 200 and the pitch error is +/- 0.200 mm for every 300 mm of thread.
Screw type KUE is made from carbon steel EN 10083-2 1C45-1.0503 with an approximate hardness of 250 HB. The lead accuracy class is 100 (class 200 for diameters bigger than 80x10) and the pitch error is +/- 0.100 mm for every 300 mm of thread.
Screw type KRP is made from stainless steel INOX A2-AISI 304-1.4301 with an approximate hardness of 260 HB. The lead accuracy class is 200 and the pitch error is +/- 0.200 mm for every 300 mm of thread.