R8 Collet 20mm Chuck Holder Built From 65Mn Spring Steel Hardened To 55HRC With Precision Ground Finish 7/16-20UNF Thread Rock Solid Milling Accessory For Accurate Metalworking And CNC Projects
✔️ 20mm clamping dia, 7/16-20UNF drawbar thread, hardened 55HRC
The R8 collet chuck holder is a precision milling accessory made from 65Mn spring steel hardened to 55HRC and precision ground. It fits milling machine spindle taper holes for the R8 system and is used to clamp tools and swap tapers, expanding your machine’s tool-range for metalworking and CNC projects.
✅ Clamping Diameter: 20mm / 0.79"
✅ Drawbar Thread: 7/16-20UNF
✅ Material: 65Mn Spring Steel
✅ Hardness: HRC 55
✅ Accuracy: 0.0005" (0.013mm)
✅ Total Length: 103.5mm / 4.07"
✅ Top Diameter: 32mm / 1.26"
✅ Bottom Diameter: 24.1mm / 0.95"
💡 What is a handy long-tail question about R8 collet holders used in CNC milling and tool changes? This quick FAQ-style answer helps you plan tool changes smoothly. - For practical use, look for a 20mm clamping diameter and a 7/16-20UNF drawbar thread - How does 65Mn steel hardened to 55HRC improve wear resistance and longevity - Why is a precision ground finish important for reducing runout in CNC work - What dimensions matter when matching spindle bore to tool shanks
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