ER Collet Nut for tool holder 

ER NUT,The commonly used types of tool holder nuts are: ER-A type: [ER11A, ER16A, ER20A], ER-M type: [ER8M, ER11M, ER16M], ER-UM type: [ER25UM, ER32UM, ER40UM, ER50UM], GER: [GER16, GER20, GER25, GER32], GSK, SK high-speed tool handle nuts. ER type for ER tool holder , SK for SK tool holder, GER for GER high-speed tool holder.The tool handle nuts are made of high quality chromium-molybdenum steel with hardness between HRC 46 and 52 degrees and accuracy within 0.005 mm. After hardening, the finish thread of the roughing truck is rust-proof on the surface, with exquisite appearance and durability. The concentricity and precision of nuts are high, which meets the higher requirements of processed products. The machine tool processing accuracy and tool life are improved. High precision, good wear resistance, stable performance and reasonable price.