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Description
Technical data for the ER20 Ø3 mm collet
| Technical Data | |
|---|---|
| Bore Diameter d | 3-2 mm |
| Outside Diameter D | 21 mm |
| Overall Length L | 31.5 mm |
ER20 3 mm collet – stable clamping of small diameters with a collapse range exceeding compact systems
The ER20 collet with a range of 2-3 mm provides a solution for precision machining of components requiring micro diameters while ensuring the mechanical stability of a larger system. 65Mn steel hardened to 44-48 HRC and manufacturing in accordance with DIN 6499B ensure radial runout not exceeding 0.015 mm over many thousands of clamping cycles. A collapse range of up to 0.9 mm provides versatile fitting of tools with slightly different shank diameters without the need to stock dedicated collets.
Key advantages of the ER20 3 mm collet
- Maximum runout of 0.015 mm in accordance with DIN 6499B – precision that eliminates positioning errors when milling microcomponents and engraving
- Clamping range of 2-3 mm with a tolerance of 0.9 mm – flexibility that reduces the number of collets needed to fully equip a shop
- ER20 system dimensions of 21×31 mm – mass exceeding that of ER11 by more than 150 percent effectively absorbs vibration at high spindle speeds
- Hardened 65Mn steel with a consistent hardness of 44-48 HRC – retention of elasticity characteristics throughout the tool's service life
- Compliance with international ISO 15488-B standards – universal compatibility with chucks from leading CNC machine tool manufacturers
Designed to clamp micro end mills, precision drills, engraving tools, and countersinks used in machining printed circuit boards, jewelry parts, and model-making components. In the micro diameter range, the ER20 system combines the advantages of compact dimensions with mechanical strength that eliminates the risk of tool deflection under increased cutting forces. Used with aluminum, brass, engineering plastics, and composites, where dimensional accuracy is a criterion for finished product functionality. Chosen by specialist shops requiring reliable clamping when working with delicate small-diameter tools.
Frequently asked questions
It is used to clamp micro end mills, precision drills with 2-3 mm shanks, diamond engraving tools, and countersinks used in electronics and jewelry making. The extended 0.9 mm collapse range accommodates a wide range of tool diameters.
The greater mass of the ER20 design provides more effective vibration damping at speeds above 18000 rpm, directly improving surface finish quality. Its 0.9 mm tolerance significantly exceeds the 0.5 mm collapse range available in the ER11 system, reducing the need for numerous dedicated collets.
The compact ER11 model has a size of 11.5×18 mm, the standard ER16 measures 17×28 mm, the medium-sized ER20 has dimensions of 21×31 mm, the reinforced ER32 measures 33×40 mm, while the most robust ER40 is specified as 41×46 mm. The system can be identified by the designation engraved on the collet body in accordance with DIN 6499B.
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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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