ER Series Standard Spring Collet Chuck for CNC Milling Machines

ER Series Standard Spring Collet Chuck for CNC Milling Machines

High-precision spring collets with 0.008mm runout accuracy, available in ER8-ER50 sizes, ideal for tool holding in CNC milling machines, engraving machines and machining centers.
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Description

ER series standard spring collets are manufactured from high-quality spring steel with overall quenching and precision grinding, the most widely used tool holding accessories for CNC machining.
  1. Ultra-high precision manufacturing ensures ≤0.008mm runout accuracy, delivering excellent machining precision and surface finish.
  2. High elasticity and fatigue resistance provide uniform clamping force and long service life, suitable for high-speed machining operations.
  3. Complete size range from ER8 to ER50 covers all common tool diameters from 1mm to 36mm, meeting various machining requirements.
  4. Standard 16° taper design is fully compatible with all mainstream ER collet chucks and tool holders on the market.
  5. Hardened and ground surface provides superior wear resistance and corrosion resistance.
  6. Available in standard precision (0.015mm) and high precision (0.008mm) grades to meet different application needs.

Complete Specification Table

Overall Dimension Specification

Series L/D (Length/Diameter) Clamping Range (mm)
ER8 13.5/8.45 1.0-5.0
ER11 18.5/11.5 1.0-7.0
ER16 27.5/17.0 1.0-10.0
ER20 31.5/21.0 1.0-13.0
ER25 34.0/26.0 1.0-16.0
ER32 40.0/33.0 1.0-20.0
ER40 46.0/41.0 1.0-26.0
ER50 60.0/51.0 5.0-36.0

Complete Clamping Size Specification

Clamping Size (mm) ER8 ER11 ER16 ER20 ER25 ER32 ER40 ER50 Price
1.0-0.5 ER8-1.0 ER11-1.0 ER16-1.0 ER20-1.0 ER25-1.0 ER32-1.0 ER40-1.0
1.5-1.0 ER8-1.5 ER11-1.5 ER16-1.5 ER20-1.5 ER25-1.5 ER32-1.5 ER40-1.5
2.0-1.5 ER8-2.0 ER11-2.0 ER16-2.0 ER20-2.0 ER25-2.0 ER32-2.0 ER40-2.0
2.5-2.0 ER8-2.5 ER11-2.5 ER16-2.5 ER20-2.5 ER25-2.5 ER32-2.5 ER40-2.5
3.0-2.5 ER8-3.0 ER11-3.0 ER16-3.0 ER20-3.0 ER25-3.0 ER32-3.0 ER40-3.0
3.5-3.0 ER8-3.5 ER11-3.5 ER16-3.5 ER20-3.5 ER25-3.5 ER32-3.5 ER40-3.5
4.0-3.5 ER8-4.0 ER11-4.0 ER16-4.0 ER20-4.0 ER25-4.0 ER32-4.0 ER40-4.0
4.5-4.0 ER8-4.5 ER11-4.5 ER16-4.5 ER20-4.5 ER25-4.5 ER32-4.5 ER40-4.5
5.0-4.5 ER8-5.0 ER11-5.0 ER16-5.0 ER20-5.0 ER25-5.0 ER32-5.0 ER40-5.0 ER50-5.0
5.5-5.0 ER11-5.5 ER16-5.5 ER20-5.5 ER25-5.5 ER32-5.5 ER40-5.5 ER50-6.0
6.0-5.5 ER11-6.0 ER16-6.0 ER20-6.0 ER25-6.0 ER32-6.0 ER40-6.0 ER50-6.0
6.5-6.0 ER11-6.5 ER16-6.5 ER20-6.5 ER25-6.5 ER32-6.5 ER40-6.5 ER50-7.0
7.0-6.5 ER11-7.0 ER16-7.0 ER20-7.0 ER25-7.0 ER32-7.0 ER40-7.0 ER50-7.0
7.5-7.0 ER16-7.5 ER20-7.5 ER25-7.5 ER32-7.5 ER40-7.5 ER50-8.0
8.0-7.5 ER16-8.0 ER20-8.0 ER25-8.0 ER32-8.0 ER40-8.0 ER50-8.0
8.5-8.0 ER16-8.5 ER20-8.5 ER25-8.5 ER32-8.5 ER40-8.5 ER50-9.0
9.0-8.5 ER16-9.0 ER20-9.0 ER25-9.0 ER32-9.0 ER40-9.0 ER50-9.0
9.5-9.0 ER16-9.5 ER20-9.5 ER25-9.5 ER32-9.5 ER40-9.5 ER50-10.0
10.0-9.5 ER16-10.0 ER20-10.0 ER25-10.0 ER32-10.0 ER40-10.0 ER50-10.0
10.5-10.0 ER20-10.5 ER25-10.5 ER32-10.5 ER40-10.5 ER50-11.0
11.0-10.5 ER20-11.0 ER25-11.0 ER32-11.0 ER40-11.0 ER50-11.0
11.5-11.0 ER20-11.5 ER25-11.5 ER32-11.5 ER40-11.5 ER50-12.0
12.0-11.5 ER20-12.0 ER25-12.0 ER32-12.0 ER40-12.0 ER50-12.0
12.5-12.0 ER20-12.5 ER25-12.5 ER32-12.5 ER40-12.5 ER50-13.0
13.0-12.5 ER20-13.0 ER25-13.0 ER32-13.0 ER40-13.0 ER50-13.0
14.0-13.0 ER25-14.0 ER32-14.0 ER40-14.0 ER50-14.0
15.0-14.0 ER25-15.0 ER32-15.0 ER40-15.0 ER50-15.0
16.0-15.0 ER25-16.0 ER32-16.0 ER40-16.0 ER50-16.0
17.0-16.0 ER32-17.0 ER40-17.0 ER50-17.0
18.0-17.0 ER32-18.0 ER40-18.0 ER50-18.0
19.0-18.0 ER32-19.0 ER40-19.0 ER50-19.0
20.0-19.0 ER32-20.0 ER40-20.0 ER50-20.0
21.0-20.0 ER40-21.0 ER50-21.0
22.0-21.0 ER40-22.0 ER50-22.0
23.0-22.0 ER40-23.0 ER50-23.0
24.0-23.0 ER40-24.0 ER50-24.0
25.0-24.0 ER40-25.0 ER50-25.0
26.0-25.0 ER40-26.0 ER50-26.0
27.0-26.0 ER50-27.0
28.0-27.0 ER50-28.0
29.0-28.0 ER50-29.0
30.0-29.0 ER50-30.0
31.0-30.0 ER50-31.0
32.0-31.0 ER50-32.0
33.0-32.0 ER50-33.0
34.0-33.0 ER50-34.0
35.0-34.0 ER50-35.0
36.0-35.0 ER50-36.0

Parameter Explanation

  • ER Series : Standard spring collet series, the number indicates the maximum clamping diameter range
  • L/D : Length to diameter ratio of the collet body
  • Clamping Size : The range of tool shank diameters that the collet can securely hold
  • Runout Accuracy : Standard grade ≤0.015mm, high precision grade ≤0.008mm
  • Taper Angle : Standard 16° taper for universal compatibility with ER collet chucks

Applications

CNC Machining

Ideal for CNC lathe, milling and machining center operations, ensuring high-precision dimensional control and reliable tool holding for mass production.

Quality Control Labs

Suitable for quality inspection departments and calibration labs, providing accurate measurement data to verify product compliance with ISO and industry standards.

Mold & Die Making

Perfect for mold and die workshops, where micron-level precision tools and gauges are essential for complex cavity machining and final inspection.

OEM/ODM Projects

Customizable solutions for OEM and ODM manufacturing partners, offering tailored measuring tools and CNC accessories to meet unique production requirements.

Automotive Manufacturing

Designed for automotive component production lines, ensuring consistent precision and durability in engine parts, transmission components and assembly processes.

Aerospace & Precision Engineering

Ideal for aerospace and defense manufacturing, where ultra-high precision instruments and reliable tool holders meet strict quality and safety requirements.

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