ER20 collets hold shanks from 0.5 to 13 mm. Each collet covers 1 mm: pick the one whose range includes the shank diameter.
CLAMPING RANGE0.5–13 mmstandard maximum, DIN 6499
STEP1 mmrange of each collet
COLLET BODYØ 21 × 31.5 mmdiameter × length
TAPER8°ISO 15488
Sizes in the series
ER20 collets are marked with their range, largest to smallest: collet 13–12 holds shanks from 12 to 13 mm.
1–0.5
2–1
3–2
4–3
5–4
6–5
7–6
8–7
9–8
10–9
11–10
12–11
13–12
How to choose the collet
Take the collet whose range includes the shank diameter, ideally close to the collet's maximum: the grip is longer and runout lower. A 7 mm shank in ER20 needs collet 7–6.
Clamping and care
Snap the collet into the nut before fitting it to the chuck, then tighten with the wrench and torque given by the chuck maker. Keep collet and taper clean: one chip or dirty oil film is enough to lose runout.
Clamping ranges to DIN 6499 / ISO 15488 and the REGO-FIX ER system catalogue; body dimensions as in published ER charts. The collet maker's catalogue is what counts.
Type the shank diameter: see which collet fits, in every ER size.
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