Value Collection 231-4810 R8 Round Collet 10mm

Product Description

The VALUE COLLECTION 231-4810 is a 10mm R8 round collet machined from steel for use in Bridgeport-style vertical milling machines and compatible R8 spindle equipment. The collet accepts a 7/16-20 drawbar thread and holds 10mm round shank tooling. It is rated to a total indicator runout (TIR) of 0.0007 inches, supporting accurate, repeatable tool holding during milling, drilling, and boring operations. This collet is a standard shop consumable installed by machinists and maintenance professionals in job shops, tool rooms, and production environments.

The 231-4810 is suited for vertical knee mills and other machine tools equipped with an R8 spindle taper. It is used to secure 10mm round shank end mills, drill bits, and similar cutting tools. The 7/16-20 drawbar thread is the standard thread size for R8 spindle machines, making this collet a direct-fit replacement in most R8-equipped mills. It weighs 0.59 pounds, making it a lightweight, easy-to-handle tooling component for everyday shop use.

Key Features

• 10mm bore accepts standard 10mm round shank tooling
• R8 taper profile fits Bridgeport-style and compatible vertical mill spindles
• 0.0007 inch TIR for accurate, low-runout tool holding
• 7/16-20 drawbar thread matches standard R8 spindle drawbar configuration
• Steel construction for durability under repeated clamping cycles

Compatibility

Designed as an OEM-style replacement collet for R8 spindle milling machines using a 7/16-20 drawbar thread and requiring a 10mm round collet bore.

Installation Notes

Installation and removal should be performed by a qualified machinist or maintenance technician. Always power down and lock out the machine spindle before inserting or removing the collet. Use the appropriate drawbar wrench to tighten the 7/16-20 drawbar to secure the collet in the spindle taper. Do not over-tighten the drawbar, as this can damage the collet taper or spindle bore.