Value Collection 231-4730 R8 Collet 15/32 Inch Steel

Product Description

The VALUE COLLECTION 231-4730 is a steel R8 collet designed for use in milling machines and manual machining centers equipped with an R8 spindle taper. The collet accepts a 15/32-inch tool shank and features a 7/16-20 drawbar thread for secure retention in the spindle. Total Indicated Runout (TIR) is rated at 0.0007 inches, supporting accurate, repeatable tool holding during face milling, drilling, and end milling operations. Machinists and tool-room operators working with Bridgeport-style knee mills and similar R8-spindle machines will find this collet a direct-fit solution for standard tooling in this bore size.

This R8 collet is suited for job shops, maintenance facilities, and machine shops running manual vertical milling machines with R8 spindles. It is appropriate for light-to-moderate cutting operations where precise tool concentricity is required. The 15/32-inch bore accommodates tool shanks of that diameter, filling a common gap between the more frequently stocked 7/16-inch and 1/2-inch sizes. Installation requires a standard drawbar and appropriate wrench for spindle engagement.

Key Features

• 15/32-inch bore diameter for accurate shank fitment in that size range
• R8 taper profile compatible with R8-spindle milling machines
• 7/16-20 drawbar thread for positive spindle retention
• 0.0007-inch TIR for repeatable tool concentricity
• Steel construction for durability under milling loads

Compatibility

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

Installation Notes

R8 collets are installed and removed by a licensed machinist or experienced machine operator. Power down and lock out the milling machine before changing collets. Insert the collet into the spindle, engage the drawbar by hand, then tighten with the appropriate wrench while holding the spindle brake — do not overtighten, as this can distort the collet bore. Inspect the collet and spindle taper for chips or debris before each use to maintain TIR performance.