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Description
Technical data for the ER20 Ø4 mm collet
| Technical Data | |
|---|---|
| Hole diameter d | 4-3 mm |
| Outside diameter D | 21 mm |
| Overall length L | 31.5 mm |
ER20 4 mm collet – reliable clamping of small tools with the enhanced rigidity of a medium-sized system
The ER20 collet with a clamping range of 3-4 mm combines precise clamping of small tool diameters with the mechanical stability of a reinforced system. Hardened 65Mn steel with a hardness of 44-48 HRC and manufacture to DIN 6499 guarantee a maximum radial runout of 0.015 mm while maintaining full positioning repeatability. The 0.9 mm collapse range significantly exceeds the capabilities of compact systems, eliminating the need to stock multiple dedicated collets for similar diameters.
Key advantages of the ER20 4 mm collet
- Radial runout limited to 0.015 mm in accordance with DIN 6499 – precision essential for milling tight-tolerance parts and engraving
- Clamping range of 3-4 mm with a tolerance of 0.9 mm – flexibility that allows clamping of tools with slightly different shank diameters
- ER20 system dimensions of 21×31 mm – a design with sufficient mass to effectively damp vibration at speeds exceeding 15000 rpm
- 65Mn material hardened to 44-48 HRC – steel that retains its elastic properties over many years of intensive use
- Compliance with the international ISO 15488 standard – full interchangeability with holders from reputable CNC machine manufacturers
A collet designed for holding small-diameter end mills, precision drills, taps, and countersinks used to machine parts requiring high dimensional accuracy. The ER20 system for the 3-4 mm range offers greater stability than the compact ER11, providing better vibration damping while retaining the ability to work with small tools. Used for machining aluminum, brass, engineering plastics, and mild steels where surface quality is a priority. Selected by toolrooms and precision machine shops that require a combination of accuracy and durable clamping components.
Frequently asked questions
It is used to secure small end mills, precision drills with 3-4 mm shanks, taps, and countersinks used in precision machining. The extended 0.9 mm clamping tolerance allows a single collet to cover multiple similar diameters.
The ER20 collet measuring 21×31 mm has almost twice the mass of the ER11 measuring 11.5×18 mm, providing significantly better vibration absorption at high speeds. The 0.9 mm collapse range of the ER20 system is also nearly twice the 0.5 mm available with ER11.
The compact ER11 model is identified by its 11.5×18 mm size, the versatile ER16 measures 17×28 mm, the medium-sized ER20 measures 21×31 mm, the reinforced ER32 measures 33×40 mm, and the most robust ER40 measures 41×46 mm. The system designation is engraved on 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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