BT30 Er20a-70L,100L Er Collet Chuck
BT30 Tool Holder accepts all ER20 collets
ER20 Collets range from 1 mm to 14 mmThe thread inside internal stop screwMade from alloy steel hardened to 54 56rcBalanced to G6.3 at 12,000 rpmsConcentricity is less than .005 micron up to 100 Length and 0.012 up to 200 Length.All critical tool holder surfaces are precision-groundCoolant through capabilityThe gauge length is 70mm,100MMRear thread for the pull stud is M12X1.75
