Description
BT30 Er20a-70L,100L Er Collet Chuck
BT30 Tool Holder accepts all ER20 collets
ER20 Collets range from 1 mm to 14 mm
The thread inside internal stop screw
Made from alloy steel hardened to 54 56rc
Balanced to G6.3 at 12,000 rpms
Concentricity is less than .005 micron upto 100 Length and 0.012 upto 200 Length
All critical tool holder surfaces precision ground
Coolant through capability
The gage length is 70mm,100MM
Rear thread for the pull stud is M12X1.75
