High-Precision R8 ER40 Collet Chuck for Milling Machines
✔️ 0.0002 in TIR, 7/16-20 drawbar, 8000 RPM, single unit

This is a high-precision R8 to ER40 collet chuck with a 7/16-20 drawbar thread, designed for milling machines and CNC setups. It’s offered as a single unit ready to mount on standard spindles, providing reliable toolholding for milling, drilling, and tapping operations.

✅ R8 Shank for ER40 Collets
✅ Drawbar Thread: 7/16-20
✅ Collet Nut Diameter: 2.48"
✅ Clamping Range: 1-26 mm
✅ Max RPM: 8000 RPM
✅ Max TIR: 0.0002 in O.D to I.D
✅ Hardened alloy steel, hardened to HRC 58

💡 What is a precision milling collet chuck and why buy one for your setup? This handy tool secures cutting tools with tight concentric alignment for reliable finishes. - Improves grip and runout for higher quality finishes - Fits common spindles via R8 to ER40 configurations - Supports high RPM operation with hardened alloy steel and precise grinding