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Description
Technical data for the ER20 Ø12 mm collet
| Technical Data | |
|---|---|
| Bore Diameter d | 12-11 mm |
| Outside Diameter D | 21 mm |
| Overall Length L | 31.5 mm |
ER20 12 mm collet – secure clamping for standard diameters in a reinforced system
The ER20 collet with a 11-12 mm range is a solution for one of the most versatile tool diameters in machining. Hardened 65Mn steel construction with a hardness of 44-48 HRC and precision in accordance with DIN 6499B ensure a maximum radial runout of 0.015 mm during long-term use. The wide 0.9 mm collapse range eliminates the need for dedicated collets for every tenth of a millimeter.
Key advantages of the ER20 12 mm collet
- Maximum radial runout of 0.015 mm – maintains dimensional accuracy when milling pockets and medium-sized holes
- Clamping range of 11-12 mm with a 0.9 mm collapse range – flexible fit reduces workshop tooling costs
- ER20 system dimensions (21×31 mm) – greater mass compared with ER16 stabilizes the process at high torque
- 65Mn steel with a consistent hardness of 44-48 HRC – the material maintains its elastic properties throughout its service life
- Compliance with international standards DIN 6499B and ISO 15488-B – universal compatibility with tool holders from leading brands
Ideal for machining structural steels, aluminum alloys, and composite materials. The 12 mm diameter is among the most popular sizes for cylindrical milling cutters and drills for mounting holes in mechanical structures. The ER20 system combines the advantages of compact dimensions with the mechanical strength required to operate under increased cutting forces. Chosen by manufacturing plants requiring reliability and long service life from clamping tools.
Frequently asked questions
It is used to secure shank-type and cylindrical milling cutters, twist drills, countersinks, and reamers with shank diameters from 11 to 12 mm. This is the most popular range in industrial applications.
The use of hardened 65Mn steel and precise geometry ensures that full elastic properties are maintained through tens of thousands of clamping cycles. With regular use and appropriate maintenance, the collet remains functional for many years.
Choosing ER20 provides greater component mass for more effective vibration reduction and increased connection rigidity. The 0.9 mm tolerance is comparable to 1 mm in ER16, but the ER20 design guarantees better stability under high loads.
The compact ER11 measures 11.5×18 mm, the popular ER16 measures 17×28 mm, the medium-sized ER20 measures 21×31 mm, the reinforced ER32 measures 33×40 mm, and the largest ER40 measures 41×46 mm. The body of each collet carries an engraved system designation 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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