- Constructed of high quality alloy steel - SAE8620/20MnCR5
- Taper to taper runout: <0.0002”
- Coolant through spindle
- CAT50 balanced G6.3@15,000 RPM
- Balanced tools supplied with QA certificates
- Supplied with depth set screws
- Supplied with high torque hard coat power nuts
- Taper shank ground to AT3 accuracy or better
- DIN AD+B flange coolant

| Collet Series | Collet Cap Min-Max (Inch) | Nut | D (Inch) | L (Inch) | Locknut Reference | Wrench Reference | Stop Screw Reference | Weight (lbs) |
| ER40 | 0.12-1.00 | Round | 2.48 | 4.00 | 312181 | 312173 | 312188 | 8.9 |
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