Value Collection 231-4815 R8 Round Collet 15mm

Product Description

The VALUE COLLECTION 231-4815 is a 15mm R8 round collet manufactured from steel for use in milling machines equipped with an R8 spindle taper. It accepts a 7/16-20 drawbar thread and holds work or tooling at a 15mm bore diameter. The collet is rated to a total indicator runout (TIR) of 0.0007 inches, providing the concentricity needed for accurate milling operations. At 0.59 pounds, it is a standard single-piece collet suited for shop floor use in both production and toolroom environments. Machinists and machine tool operators install this collet as part of routine tooling setup on compatible vertical milling machines.

R8 collets are the standard toolholding solution for Bridgeport-style vertical knee mills and similar machines that use the R8 spindle taper. The 231-4815 is appropriate for holding 15mm round shanks, including end mills, drill chucks, and other tooling with a 15mm shank diameter. This collet is suited for job shops, maintenance facilities, and production floors where milling operations require repeatable and secure tool retention. One collet is included per package.

Key Features

• 15mm bore diameter accommodates tooling with a 15mm round shank
• R8 taper profile for use in R8-spindle vertical milling machines
• 7/16-20 drawbar thread for secure retention in the spindle
• 0.0007 inch TIR rating for accurate, concentric tool holding
• Steel construction for durability under milling loads

Compatibility

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

Installation Notes

Installation is performed by a machinist or machine tool operator. Power down and de-energize the milling machine before changing collets. Insert the collet into the R8 spindle, thread the drawbar by hand, and tighten the drawbar to secure the collet before operation. Inspect the collet bore and spindle taper for chips or debris prior to installation to maintain concentricity.