Value Collection 231-4808 R8 Round Collet 8mm

Product Description

The VALUE COLLECTION 231-4808 is a steel R8 round collet designed for use in milling machines and machining centers equipped with an R8 spindle taper. The collet accepts an 8mm workholding diameter and uses a 7/16-20 drawbar thread to secure it within the spindle. It carries a total indicated runout (TIR) rating of 0.0007 inches, providing the concentricity required for accurate material removal in ferrous and non-ferrous applications. Machinists, tool-and-die technicians, and machine shop professionals install this collet as a direct workholding solution when chucking end mills, drill bits, or round-shank tooling to 8mm.

This collet is suited for manual and CNC knee mills, Bridgeport-style vertical mills, and other machines built around the R8 spindle standard. The 8mm collet size makes it a practical choice for metric tooling commonly used in precision machining, mold making, and general production work. It is sold individually, making it a straightforward add-on or replacement for an existing R8 collet set.

Key Features

• 8mm collet bore accepts standard metric round-shank tooling
• 0.0007 inch TIR rating supports accurate, low-runout cutting performance
• 7/16-20 drawbar thread matches standard R8 spindle drawbar configuration
• Steel construction provides durability under repeated clamping cycles
• R8 taper profile fits the widely used R8 spindle standard

Compatibility

Designed as an OEM-style replacement or supplemental collet for milling machines built with an R8 spindle taper and a 7/16-20 drawbar thread.

Installation Notes

Installation is performed by qualified machinists or machine tool technicians. Before installing or removing a collet, power down the machine and confirm the spindle has come to a complete stop. Insert the collet into the spindle taper and engage the drawbar thread before tightening; never overtighten the drawbar, as this can damage the collet or spindle bore. Inspect the collet bore and spindle taper for chips or debris before each use to maintain accurate runout.