Value Collection 231-4813 R8 Round Collet 13mm

Product Description

The VALUE COLLECTION 231-4813 is a steel R8 round collet designed for use in milling machines equipped with an R8 spindle taper. It accepts a 13mm workholding diameter and features a 7/16-20 drawbar thread for secure spindle engagement. With a total indicator runout (TIR) of 0.0007 inches, this collet provides consistent, repeatable tool holding accuracy suitable for precision machining operations. Machinists and tool room professionals install this collet when gripping round tooling such as end mills, drill chucks, or boring heads at the 13mm size. At 0.5 pounds, it is a compact, single-piece precision workholding component.

This collet is suited for vertical milling machines with R8 spindle tapers, a standard found widely in knee mills and bench-top mills common in job shops, maintenance facilities, and machine tool training environments. The 13mm collet size accommodates metric-dimensioned tooling shanks. It is a single-unit item appropriate for individual machine setups or as a replacement for a worn or damaged collet in an existing R8 collet set.

Key Features

• 13mm collet bore diameter for metric round tooling shanks
• R8 taper profile fits standard R8 milling machine spindles
• 7/16-20 drawbar thread for positive spindle retention
• 0.0007 inch TIR for accurate, low-runout tool holding
• Steel construction for durability in shop environments

Compatibility

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

Installation Notes

Installation and removal should be performed by a qualified machinist with the machine powered down and the spindle at rest. Clean the spindle bore and collet taper surfaces before seating to prevent runout caused by debris or burrs. Use the appropriate drawbar wrench to tighten the 7/16-20 drawbar to secure the collet; never hammer the drawbar or use impact tools on the spindle. Inspect the collet for wear or damage before each use, as a cracked or worn collet can result in tool pullout during cutting operations.