# ER32 collets

ER32 collet dimensions, bore ranges, assembly, and the differences between standard, precision, and sealed variants.

Reviewed: 2026-11-02

Tags: tooling, collets, toolholding

## Identity and function

REGO-FIX lists **24 N·m with Hi-Q ER/ERC and 20 N·m with Hi-Q ERB/ERBC** for standard and ER-UP ER32 collets with **2–2.5 mm** bores. Both nut groups use **136 N·m** at **8–22 mm**. These are nut-tightening settings for the listed bore, collet and nut combinations. For internal coolant, verify the sealed variant and its separate shank requirements. [REGO-FIX main catalog, printed p. 293](https://regousa.com/wp-content/uploads/2022/04/REGO-FIX-Main-Catalogue-ENGLISH.pdf#page=297).

REGO-FIX identifies its standard ER collets as DIN 6499-B / ISO 15488 form B.

## Dimensions and neighboring sizes

The following are Techniks catalog dimensions and metric-set capacities, not universal limits for every producer or special collet. Diameter is the collet's outside diameter; length is its body length, not tool projection or holder gauge length. [Techniks, printed p. 16](https://www.techniksusa.com/downloads/catalogs/CNC_Router_Catalog_2022_web.pdf#page=18).

| Family | Outside diameter | Body length | Listed set | Shanks covered by that set |
| --- | --- | --- | --- | --- |
| ER16 | 17 mm | 27.5 mm nominal | 04202MS | 0.5–10 mm |
| ER25 | 26 mm | 34 mm | 04204MS | 1–16 mm |
| ER32 | 33 mm | 40 mm | 04205MS | 2–20 mm |
| ER40 | 41 mm | 46 mm | 04206MS | 3–26 mm |

The table gives collet dimensions. Check the complete nut and holder envelope for access.

REGO-FIX lists 40 mm ER32 bodies across 2–22 mm bores. Its ER16 table also lists 26 mm length for 9.5–10 mm bores, allowing up to 27.5 mm depending on production: family lengths have exceptions. [REGO-FIX main catalog, printed p. 295](https://regousa.com/wp-content/uploads/2022/04/REGO-FIX-Main-Catalogue-ENGLISH.pdf#page=299).

## Bore range and inch shanks

A family-wide capacity is different from one collet's clamping interval. Techniks part 04232-03 has a 2–3 mm capacity; its 3 mm designation is the upper end. It is not a universal collet for every shank below 3 mm. [Techniks 04232-03 specifications](https://shop.techniksusa.com/cnc-machining-center-tooling-accessories/collets/er-collet/04232-03).

For an original arithmetic example, assume a particular collet is explicitly rated for 12–13 mm shanks. A 1/2-inch shank is exactly `0.5 × 25.4 = 12.7 mm`, within that interval; collapse from its 13 mm upper limit is `13 − 12.7 = 0.3 mm`. A collet with a 12 mm maximum is undersized by `12.7 − 12 = 0.7 mm`. REGO-FIX explicitly prohibits oversized shanks. This calculation establishes diameter inclusion only, not adequate grip, runout, or suitability for a cut. [REGO-FIX standard ER guidance](https://us.rego-fix.com/en/products/collets/standard?system=ER).

## Assembly and engagement

REGO-FIX's assembly sequence captures the collet groove in the nut's eccentric ring before the nut is screwed onto the holder. Its guidance favors full-length tool insertion where possible and prohibits engagement shorter than two-thirds of collet length. Applied to a 40 mm body, that lower boundary is `40 × 2/3 = 26.67 mm`. This derived value does not establish that a particular tool has enough cylindrical shank or that a holder has enough internal depth. [REGO-FIX ER-UP assembly guidance](https://us.rego-fix.com/en/products/collets/ultra-precision?system=ER).

## Tightening torque belongs to the nut and bore

REGO-FIX's table gives these recommendations for standard ER and ER-UP collets with its Hi-Q nuts. Values are applied nut-tightening torque, not cutting torque or transmitted torque capacity. [REGO-FIX main catalog, printed p. 293](https://regousa.com/wp-content/uploads/2022/04/REGO-FIX-Main-Catalogue-ENGLISH.pdf#page=297).

| ER32 bore band | Hi-Q ER / ERC nut | Hi-Q ERB / ERBC nut |
| --- | --- | --- |
| 2–2.5 mm | 24 N·m | 20 N·m |
| 3–7.5 mm | 136 N·m | 128 N·m |
| 8–22 mm | 136 N·m | 136 N·m |

Use separate specifications for other nut designs, manufacturers and tapping collets.

## Precision and coolant variants

REGO-FIX lists 10 µm TIR for its standard ER family and 5 µm for ER-UP. TIR is total indicated runout. These family figures do not establish the assembled spindle-to-cutting-edge error or a finished-part tolerance. [REGO-FIX standard ER](https://us.rego-fix.com/en/products/collets/standard?system=ER), [REGO-FIX ER-UP](https://us.rego-fix.com/en/products/collets/ultra-precision?system=ER).

The manufacturer's metallic-sealed ER family is intended for internal coolant and lists 6 µm TIR and a 0.5 mm clamping range, with an explicit exception for counterbored ER-DM collets. It also excludes Weldon- and Whistle-notch shanks from DM compatibility and describes sealing disks as its alternative for those shanks. The standard-collet collapse range therefore cannot be assumed for a sealed variant. [REGO-FIX metallic-sealed ER](https://us.rego-fix.com/en/products/collets/metallic-sealed?system=ER).

## Coverage and source limits

This reference covers toolholding geometry and selected manufacturer products. It does not establish workholding suitability, a universal speed limit, pullout resistance, coolant pressure, or a shop's installed equipment and approved process settings. Bore range, nut form, tool engagement, and the complete holder assembly remain separate physical constraints.

The Techniks *CNC Router Tooling Catalog* and REGO-FIX English main catalog (document code 0362.00251 / ENG.1) are cited by printed page. Neither inspected document supplies a confirmed publication year in its cover or colophon; years in download paths are not treated as edition dates. REGO-FIX's linked product pages carry a 2026 copyright footer but no technical revision date. The review date above records this article's research review, not a product revision.

For broader context, see [Cutting tools and tooling references](../index.md).