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- Collet Chuck accepts all ER20 collets
- Works on all CAT 40 machines
- Threaded for stop screw type 1 (not included)
- All critical surfaces precision ground
- Made from alloy steel hardened to 54 - 56rc
- Balanced to G2.5 at 20,000 rpms
- Gage length is 4.5 inches
- Concentricity is less than .0001 at collet face
- Collet nut is included
- Mini Collet Nut is slimmer than standard collet nut
- ER20 Mini Nut has an id thread of 24mm X 1.0 pitch. Outside diameter is 1.102 inches (28mm)
- Must use ER20M collet wrench
- Coolant thru capability
- Rear thread for pull stud is 5/8—11
- MariTool Part# is CAT40-ER20-4.5MT
