UM-TYPE ER-40 COLLET CHUCK NUT (3900-0692)

UM-Type ER-40 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 M50 X 1.5 D is 63 mm L is 25.5 mm Shipping Weight: 0.6 lbs