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- Collet Chuck accepts all ER40 collets
- Works on all NMTB 40 machines with a 5/8-11 drawbar
- All critical surfaces precision ground
- Made from alloy steel hardened to 54 - 56rc
- Gage length is 55mm (2.16 inches)
- Concentricity is less than .0001 at collet face
- Internal stop screw included
- Rear thread for drawbar is 5/8—11
- MariTool Part# is NMTB40-ER40-55
