Value Collection 231-4803 R8 Round Collet 3mm

Product Description

The VALUE COLLECTION 231-4803 is a 3mm R8 round collet designed for use in milling machines equipped with an R8 spindle taper. Machined from steel, it accepts a 7/16-20 drawbar thread and holds workpieces or tooling at a 3mm bore diameter. Total indicated runout (TIR) is rated at 0.0007 inches, supporting consistent, repeatable tool holding in light to medium milling operations. This collet is installed by machinists and toolroom technicians as part of a standard R8 collet setup on compatible vertical milling machines.

The 231-4803 is suited for vertical knee mills and similar machines fitted with an R8 spindle, commonly found in job shops, maintenance facilities, and machine tool training environments. It is used when tooling or stock with a 3mm shank diameter must be held securely during milling operations. The collet is inserted directly into the spindle and tightened via the 7/16-20 drawbar thread.

Key Features

• 3mm bore diameter for precise tool or stock holding
• R8 taper profile for direct spindle insertion
• 7/16-20 drawbar thread for secure engagement
• 0.0007 inch TIR for consistent runout control
• Steel construction for durability in milling applications

Compatibility

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

Installation Notes

Installation is performed by machinists or toolroom technicians with the machine powered off and the spindle fully stopped. Insert the collet into the R8 spindle bore and engage the drawbar thread before snugging down. Do not overtighten the drawbar, as this can damage the collet or spindle taper surfaces. Inspect the spindle bore and collet taper for debris or damage before seating.