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Description
| Technical Data | |
|---|---|
| Type | 9833 |
| Size | ER 25 |
| Standard | DIN 6499 (ISO 15488) |
| DIN designation | D25 |
| Outside Diameter D | 42 mm |
| Height H | 20.0 mm |
| Thread | M34×1 |
| Collet Clamping Range | 1 – 16 mm |
| Tightening Torque | 55 – 70 Nm |
ER 25 nut – for a collet chuck with DIN 6499 collets
The ER 25 nut is a standard clamping component designed for collet chucks conforming to DIN 6499 (ISO 15488). The M34×1 thread ensures precise, uniform seating of the ER 25 collet in the chuck without the risk of tool misalignment. Hardened steel construction ensures high wear resistance even with repeated tightening to torques of up to 70 Nm. The type 9833 nut, with an outside diameter of 42 mm and a height of 20 mm, is intended for toolrooms, CNC machining center operators, and shops specializing in precision milling and drilling.
Key benefits of the ER 25 nut
- Precise tool clamping thanks to the M34×1 thread with tolerance class 6H, which distributes clamping force evenly around the entire circumference of the collet
- High durability and abrasion resistance of hardened steel with a hardness of 45-50 HRC, allowing thousands of tool change cycles without loss of accuracy
- Full compliance with DIN 6499 (ISO 15488) ensuring interchangeability with ER 25 chucks and collets from all manufacturers using this standard
- The internal tapered surface, matched to ER 25 collets with a clamping range of 1 to 16 mm, ensures secure gripping of shanks of various diameters
- Guide slots on the face of the nut allow tightening with a dedicated ER wrench or hook spanner, speeding up tool changes at the workstation
- The black oxide finish protects the nut against corrosion in workshop environments where oil-emulsion coolants are present
The ER 25 nut is used on CNC milling machines, drill presses, machining centers, and tool grinders equipped with ER collet chucks. The recommended tightening torque is 55-70 Nm using a torque wrench, ensuring repeatable radial runout below 0.01 mm. Regular inspection of the thread condition and cleanliness of the tapered surface extends the service life of the entire clamping system.
Frequently asked questions
The optimum tightening torque for the ER 25 nut is 55-70 Nm. A torque wrench is required to achieve the correct clamping force — exceeding the recommended torque deforms the collet and reduces clamping accuracy.
Yes, the ER 25 nut with an M34×1 thread fits any chuck meeting DIN 6499 (ISO 15488) requirements, regardless of manufacturer. Check the thread designation on the chuck body before installation.
Before each installation, remove chips and contaminants from the thread and tapered surface of the ER 25 nut. After 200-300 tool changes, applying a thin layer of machine grease to the threads is recommended.
Product accessories
Collet chuck 7616-40-60 ER25 DIN 2080
Reference: 0000003291 In stock > 10 items
€31.58
€38.84 brutto
Collet chuck 7812 20 ER25 100 DIN 1835
Reference: 0000012479 In stock < 10 items
€21.05
€25.89 brutto
Collet chuck 7626 40 100 ER25 MAS 403 BT
Reference: 0000012116 In stock > 10 items
€34.21
€42.08 brutto
Collet chuck 7626 30 60 ER25 MAS 403 BT
Reference: 0000013002 In stock < 10 items
€55.26
€67.97 brutto
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Shipping
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| Courier GLS | Przelew24 / Prepayment | 14,76 zł gross | Delivery time 1 working day |
| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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