... material, HRC52 ER nut -Taper 30 degree thread -With Patent products -G6.3 dynamic balance -ISO9001:2008 ... ensure precision, thread tolerance is 4H.Feature: With G6.3 dynamic balancing, suitable for rpm10,000, ... is small than standard nut, thread is different with type A.Other ER nut: type UM/RD ... type KM/RD.Other products: carbide end mill, carbide inserts, carbide rod, tool holder, tool heads, chuck, ...