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Description
Technical data for the ER20 Ø5 mm collet
| Technical Data | |
|---|---|
| Hole diameter d | 5-4 mm |
| Outside diameter D | 21 mm |
| Overall length L | 31.5 mm |
ER20 5 mm collet – versatile clamping of common diameters with enhanced system stability
The ER20 collet with a clamping range of 4-5 mm is designed for one of the most frequently used tool diameters in machining. Hardened 65Mn steel with a hardness of 44-48 HRC and compliance with DIN 6499B ensure radial runout does not exceed 0.015 mm during extended production use. The 0.9 mm collapse range allows flexible accommodation of tools with slightly different shank diameters without changing the collet.
Key advantages of the ER20 5 mm collet
- Maximum radial runout of 0.015 mm in accordance with DIN 6499B – positioning accuracy required for milling parts with stringent dimensional tolerances
- Clamping range 4-5 mm with a collapse range of 0.9 mm – versatility covering common shank diameters of industrial milling cutters and drills
- ER20 system design measuring 21×31 mm – increased mass that effectively damps vibration during machining at high cutting parameters
- 65Mn steel hardened to 44-48 HRC – material that guarantees consistent elastic properties over many years of use
- Full compliance with ISO 15488-B standards – trouble-free compatibility with holders from all reputable machine tool manufacturers
The 5 mm diameter is one of the most commonly used tool sizes in machine shops and toolrooms. The collet is suitable for holding end mills, twist drills, machine taps, and countersinks used to machine structural steels, aluminum alloys, and engineering plastics. The ER20 system offers greater rigidity than the compact ER16, resulting in better surface quality under increased cutting forces. Selected by manufacturing facilities that require a reliable and repeatable machining process.
Frequently asked questions
It is used to secure end mills, twist drills, machine taps, countersinks, and any tools with a straight shank measuring between 4 and 5 mm. This diameter is one of the most common sizes in industrial machining.
The ER20 design has larger external dimensions of 21×31 mm compared with 17×28 mm for ER16, providing greater mass for better vibration absorption during operation. The 0.9 mm clamping tolerance is slightly smaller than the 1 mm offered by ER16, but this difference is offset by greater mechanical stability during intensive cutting operations.
The smallest ER11 model is identified by its 11.5×18 mm dimensions, the commonly used ER16 by its 17×28 mm size, the medium-sized ER20 by its 21×31 mm dimensions, the reinforced ER32 by its 33×40 mm size, and the most robust ER40 by its 41×46 mm dimensions. Each collet has a system designation engraved on its body that meets the requirements of 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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