UM-TYPE ER-20 COLLET CHUCK NUT (3900-0689)

UM-Type ER-20 Collect Chuck Nut Balanced to 18,000 RPM Tolerance is .0003" Maximum Material is 42 CrMo Hardness is HRC 50-52 Thread Tolerance Class is 4H-Class Thread is M25 X 1.5 D is 35 mm L is 19 mm Shipping Weight: 0.2 lbs