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Description
Technical data for the ER20 Ø6 mm collet
| Technical Data | |
|---|---|
| Hole diameter d | 6-5 mm |
| Outside diameter D | 21 mm |
| Overall length L | 31.5 mm |
ER20 6 mm collet – precise clamping for medium-sized tools with the extended collapse range of a reinforced system
The ER20 collet with a clamping range of 5-6 mm provides a solution for one of the most versatile tool diameters used in machining. 65Mn steel hardened to 44-48 HRC and manufacture in accordance with DIN 6499 ensure radial runout does not exceed 0.015 mm over many years of production use. The 0.9 mm collapse range allows flexible clamping of tools with slightly different shank diameters, reducing collet inventory costs.
Key advantages of the ER20 6 mm collet
- Maximum radial runout of 0.015 mm according to DIN 6499 – positioning accuracy required for milling surfaces with demanding quality requirements
- Clamping range of 5-6 mm with a tolerance of 0.9 mm – flexibility covering common shank diameters of industrial tools
- ER20 system dimensions of 21×31 mm – increased structural mass that ensures stability at speeds exceeding 12000 rpm
- Hardened 65Mn steel with a hardness of 44-48 HRC – material that fully retains its elastic properties through thousands of clamping cycles
- Compliance with the international ISO 15488 standard – universal compatibility with chucks from leading CNC machine tool manufacturers
The 6 mm diameter is one of the most frequently used end mill and drill sizes in the machinery industry. The collet is suitable for holding milling cutters, twist drills, machine taps, and countersinks used to machine structural steels, aluminum alloys, and engineering plastics. The ER20 system offers greater mechanical rigidity than the compact ER16, reducing vibration amplitude and extending cutting tool life. Selected by production departments that require a repeatable machining process under varying load conditions.
Frequently asked questions
It is used to secure end mills, twist drills, machine taps, countersinks, and any tools with a straight shank measuring from 5 to 6 mm. This range covers some of the most common diameters in industrial machining.
The ER20 design measuring 21×31 mm has greater mass than the ER16 measuring 17×28 mm, providing better vibration absorption during intensive use. The 0.9 mm clamping tolerance is marginally smaller than the 1 mm available with ER16, but this difference is offset by increased mechanical rigidity under higher loads.
The compact ER11 is identified by its 11.5×18 mm dimensions, the commonly used ER16 by its 17×28 mm dimensions, the medium-sized ER20 by its 21×31 mm size, the reinforced ER32 by its 33×40 mm dimensions, and the largest ER40 by its 41×46 mm size. The system designation is engraved on the surface 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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