Technical Information Grades and Grade Descriptions Modern coating technologiesprovide higher speed capabilities,PSteel greater productivity, and longer M Stainless Steel tool life. K Cast Iron Each insert has a material grid N Non-Ferrous indicating primary and alternate uses for that tool, as well as S High-Temp Alloys whether it can be operated H Hardened Materials dry or with coolant. primary use alternate use WWW Light (finishing) ¢¢¢ Light (finishing) WW Medium ¢¢ Medium W Heavy (roughing) ¢ Heavy (roughing) Grade P M K N S H dry withcoolant THM-U WWW • • HF-N05 • Uncoated TTM/TTM08 WW ¢¢ ¢¢ • • HW-P25 • Uncoated WK15PM WW • • PVD-TiAlN Nanolayer WK15CM™ WW • MT-CVD/TiN-TiCN-Al2O3 WP20CM WW ¢¢ MT-CVD/TiN-TiCN-Al2O3 WP25PM WW WW ¢¢ WW ¢¢ • • PVD-AlTiN Multilayer G18 widia.com