High Precision ER Collet Clamping Nut ER11 ER16 ER20 ER25 ER32 ER40
High Precision ER Collet Clamping Nut ER11 ER16 ER20 ER25 ER32 ER40
High Precision ER Collet Clamping Nut — ER11 / ER16 / ER20 / ER25 / ER32 / ER40
Upgrade your milling setup with these industrial-grade ER clamping nuts, engineered for machinists and tooling professionals who demand tight tolerances and consistent performance. Available in A, M, and UM series across six ER sizes, these lock nuts deliver rock-solid collet retention on a wide range of ER tool holders.
Key Features
- High-Precision Runout: 0.005 mm beating tolerance for repeatable, accurate cuts every time.
- Premium Chrome Steel Construction: Manufactured from 20CrMoTi chromium steel, hardened to HRC 52–55 for outstanding durability and wear resistance.
- Strong Clamping Force: Firm, consistent grip that resists deformation under demanding machining loads.
- Reduced Vibration & Noise: Precision-ground inner taper (accuracy grade 4H) minimises chatter for smoother surface finishes.
- High Spindle Speed Compatible: Rated for spindle speeds up to 30,000 RPM.
- Universal Tool Holder Compatibility: Fits BT-ER, NT-ER, MTA-ER, MTB-ER, R8-ER, and ER straight extension shank tool holders.
Product Specifications
| Specification | Detail |
|---|---|
| Type | ER Clamping Nut |
| Material | Chrome Steel (20CrMoTi) |
| Hardness | HRC 52–55 |
| Runout Precision | 0.005 mm |
| Inner Taper Grade | 4H |
| Max Spindle Speed | < 30,000 RPM |
| Available Models | ER11-A, ER16-A, ER20-A, ER11-M, ER16-M, ER20-M, ER25-UM, ER32-UM, ER40-UM |
| Country of Origin | Made in China |
Package Contents
- 1 × ER Clamping Nut (model of your choice)
Notes
Actual colour may vary slightly from product images due to monitor brightness and ambient lighting conditions. Please allow for minor measurement deviations.
For workplace safety guidelines when operating milling machines and tool holders, refer to the OSHA Machine Guarding resource.
Frequently Asked Questions
Q: What ER sizes and series are available for these precision clamping nuts?
A: These ER collet clamping nuts are available in ER11, ER16, ER20, ER25, ER32, and ER40 sizes. Each size comes in A-type, M-type, or UM-type variants (e.g. ER11-A, ER16-M, ER25-UM), so you can match exactly to your existing tool holder setup.
Q: Which tool holders are compatible with these ER clamping nuts?
A: These nuts are compatible with a wide range of ER tool holders, including BT-ER, NT-ER, MTA-ER, MTB-ER, R8-ER, and ER straight extension shank holders — making them highly versatile for CNC milling centres and manual milling machines alike.
Q: What makes these ER nuts "high precision"?
A: Each nut is manufactured from hardened 20CrMoTi chrome steel (HRC 52–55) with a precision-ground inner taper to accuracy grade 4H and a runout tolerance of just 0.005 mm. This ensures minimal tool deflection, reduced vibration, and consistently accurate machining results at spindle speeds up to 30,000 RPM.