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Description
Technical data for the ER20 Ø7 mm collet
| Technical Data | |
|---|---|
| Hole diameter d | 7-6 mm |
| Outside diameter D | 21 mm |
| Overall length L | 31.5 mm |
ER20 7 mm collet – secure clamping of medium diameters with optimum mechanical stability
The ER20 collet with a clamping range of 6-7 mm provides reliable tool holding in one of the most common diameter ranges used in machine shops. Hardened 65Mn steel with a hardness of 44-48 HRC and compliance with DIN 6499 guarantee a maximum radial runout of 0.015 mm while maintaining consistent performance throughout its service life. The 0.9 mm collapse range allows versatile accommodation of tools with similar shank diameters.
Key advantages of the ER20 7 mm collet
- Radial runout not exceeding 0.015 mm in accordance with DIN 6499 – precision that guarantees high machining quality for parts with demanding tolerances
- Clamping range of 6-7 mm with a 0.9 mm collapse range – versatility that eliminates the need for dedicated collets for every tenth of a millimeter
- ER20 system design with dimensions of 21×31 mm – increased mass that provides effective vibration damping at high cutting parameters
- 65Mn steel hardened to a hardness of 44-48 HRC – material with consistent elastic properties through many thousands of clamping cycles
- Full compliance with ISO 15488 – trouble-free interchangeability with holders from all reputable machine tool manufacturers
A collet designed for holding end mills, twist drills, machine taps, and countersinks used to machine carbon steels, aluminum alloys, and engineering plastics. The 7 mm diameter is a commonly used size in the production of machine and structural components. The ER20 system exceeds the compact ER16 in mechanical rigidity, resulting in lower vibration amplitude and better surface finish during intensive milling operations. Selected by manufacturing facilities that prioritize reliability and long service life of clamping components.
Frequently asked questions
It is used to secure end mills, twist drills, machine taps, countersinks, and any tools with a straight shank in the range from 6 to 7 mm. The 0.9 mm clamping tolerance allows shanks with slightly different dimensions to be held.
The ER20 design measuring 21×31 mm has significantly greater mass than the ER16 measuring 17×28 mm, resulting in more effective vibration absorption during machining. The enhanced rigidity of the ER20 system allows higher cutting parameters without compromising the finish quality of the part.
The compact ER11 system measures 11.5×18 mm, the commonly used ER16 measures 17×28 mm, the medium-sized ER20 measures 21×31 mm, the reinforced ER32 measures 33×40 mm, and the largest ER40 measures 41×46 mm. Each collet has an engraved system designation that meets 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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