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Description
Technical data for the ER20 Ø8 mm collet
| Technical Data | |
|---|---|
| Hole diameter d | 8-7 mm |
| Outside diameter D | 21 mm |
| Overall length L | 31.5 mm |
ER20 8 mm collet – precise clamping of common diameters with optimum vibration damping
The ER20 collet with a clamping range of 7-8 mm provides a solution for one of the most commonly used cutting tool shank sizes in the machinery industry. Hardened 65Mn steel with a hardness of 44-48 HRC and compliance with DIN 6499 ensure radial runout does not exceed 0.015 mm. The 0.9 mm collapse range allows flexible accommodation of tools with similar shank dimensions.
Key advantages of the ER20 8 mm collet
- Maximum radial runout of 0.015 mm according to DIN 6499 – precision essential for finishing parts with tight dimensional tolerances
- Clamping range of 7-8 mm with 0.9 mm compensation – versatility covering one of the most popular shank diameters in the tooling industry
- ER20 system dimensions of 21×31 mm – increased structural mass that effectively reduces vibration during intensive cutting
- Hardened 65Mn steel with a hardness of 44-48 HRC – durable material that retains its elastic properties through thousands of operating cycles
- Compliance with the international ISO 15488 standard – full interchangeability with holders from leading CNC machine tool manufacturers
A collet designed for holding end mills, twist drills, machine taps, and reamers used to machine structural steels, aluminum alloys, and engineering plastics. The 8 mm diameter is one of the standard shank sizes offered by most cutting tool manufacturers. The ER20 system provides greater mechanical rigidity than the compact ER11 and ER16 systems, resulting in more stable operation at increased cutting parameters. The choice of professional machine shops that require reliable and repeatable clamping.
Frequently asked questions
It is used to secure end mills, twist drills, machine taps, reamers, and other tools with a straight shank in the range from 7 to 8 mm. The 0.9 mm clamping tolerance allows shanks with slightly different dimensions to be held.
The ER20 collet measuring 21×31 mm has significantly greater mass than the ER16 measuring 17×28 mm. The increased structural rigidity damps vibration more effectively during cutting, providing a better finish on machined surfaces.
The smallest ER11 measures 11.5×18 mm, the popular ER16 measures 17×28 mm, the medium-sized ER20 measures 21×31 mm, the large ER32 measures 33×40 mm, and the largest ER40 measures 41×46 mm. The system designation is engraved on the body of each collet in accordance with 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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