ER20 1/8 Inch Spring Collet Chuck For CNC Engraving And Milling Machines, High Precision 1mm Elastic Shrinkage, 40Cr Steel, Tight Grip Clamping Diameter 3.175mm, Boss Lathe Tooling And Milling Setup

ER20 1/8-Inch Spring Collet Chuck for CNC Engraving & Milling
✔️ Single piece ER20 1/8 collet, 21×31.5mm, 3.175mm grip, ±0.015mm

This ER20 1/8 Spring Collet Chuck is a precision tool designed to securely grip 1/8" shanks on CNC engraving and milling machines. It is widely used in mechanical processing, woodworking, and jewelry work for tight, reliable clamping during milling, drilling, and engraving tasks.

✅ Clamping diameter: 1/8" (3.175mm) with 1mm elastic shrinkage
✅ Overall size: 21mm OD × 31.5mm height (0.83" × 1.24")
✅ Material: 40Cr steel with quenching and tempering
✅ High precision: clamping tolerance ±0.015mm
✅ Applications include engraving, CNC machining, boring, and drilling

💡 What is an ER20 1/8 spring collet used for in CNC milling and engraving?

Handy tool for securing small-diameter tooling with consistent accuracy in CNC setups.

• Securely clamps 1/8" (3.175mm) shanks with 1mm elastic shrinkage
• Maintains tight tolerance around ±0.015mm for stable results
• Made from 40Cr steel with heat treatment for wear resistance

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