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Description
Technical data for the ER25 Ø4 mm collet
| Technical Data | |
|---|---|
| Hole diameter d | 4-3 mm |
| Outside diameter D | 26 mm |
| Overall length L | 34 mm |
ER25 collet 4 mm – secure clamping of common diameters in a system with optimal damping characteristics
The ER25 collet with a clamping range of 3-4 mm offers secure clamping of tools with small shank diameters in a system providing increased mechanical stability. Made from hardened 65Mn steel with a hardness of 44-48 HRC in accordance with DIN 6499, it guarantees radial runout not exceeding 0.015 mm. A clamping capacity of 1 mm provides tool-fitting flexibility unavailable in compact ER11 and ER16 systems.
Key advantages of the ER25 4 mm collet
- Maximum radial runout of 0.015 mm according to DIN 6499 – positioning precision essential for accurate milling and drilling of small components
- Clamping range of 3-4 mm with a tolerance of 1 mm – a wide collapse range allowing tools with slightly different shank diameters to be mounted
- Dimensions of 26×34 mm provide increased mass – effective vibration absorption when working with small-diameter tools
- 65Mn spring steel hardened to 44-48 HRC – material that guarantees stable clamping properties over many years of service
- Compliance with ISO 15488 – full interchangeability with holders from leading manufacturers of machine tools and tooling systems
The collet is designed to secure end mills, precision drills, engraving cutters, and countersinks used for machining electronic, medical, and watchmaking parts. The 4 mm diameter is one of the most common tool shank sizes used in precision machining of small components. The ER25 system, with a 26×34 mm construction, exceeds the smaller ER11 and ER16 systems in mass and rigidity, providing better vibration damping during demanding operations. A proven solution for professional toolrooms that prioritize maximum machining process stability.
Frequently asked questions
Used to clamp end mills, precision drills, engraving cutters, countersinks, and other tools with cylindrical shanks within the 3-4 mm range. A clamping capacity of 1 mm provides flexibility in mounting shanks with slightly different diameters.
The ER25 design, measuring 26×34 mm, has substantially greater mass than ER11 (11.5×18 mm) or ER16 (17×28 mm). Its heavier construction dampens vibration more effectively during machining, improving surface finish quality and extending the life of the tools used.
The compact ER11 has dimensions of 11.5×18 mm, the standard ER16 is defined by its 17×28 mm size, the universal ER20 is identified by dimensions of 21×31 mm, the intermediate ER25 is defined by its 26×34 mm size, the heavy-duty ER32 is recognized by dimensions of 33×40 mm, and the large ER40 is distinguished by dimensions of 41×46 mm. The system designation is marked on the collet body in accordance with the requirements of DIN 6499.
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Shipping
All orders are delivered by courier company GLS. For orders exceeding 369 PLN gross shipping is FREE
| 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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