Value Collection 231-4722 R8 Collet 11/32 Inch Steel

Product Description

The VALUE COLLECTION 231-4722 is an R8 collet machined from steel for use in Bridgeport-style vertical milling machines and other equipment with R8-compatible spindles. The collet accepts tooling with an 11/32-inch shank diameter and features a 7/16-20 drawbar thread for secure clamping. Total indicated runout (TIR) is rated at 0.0007 inches, supporting accurate, repeatable tool holding for milling, drilling, and light boring operations. This collet is a standard consumable for machine shops and maintenance facilities running R8-spindle knee mills.

R8 collets are used in vertical knee mills across job shops, toolrooms, vocational programs, and industrial maintenance departments. The 11/32-inch bore size is suited for smaller-shank end mills, drill chucks, and specialty tooling where precise concentricity is required. The 7/16-20 drawbar thread conforms to the standard R8 specification, making this collet a direct fit for equipment built to that standard without modification.

Key Features

• 11/32-inch bore accepts small-shank milling and drilling tooling
• 0.0007-inch TIR for accurate, low-runout tool holding
• 7/16-20 drawbar thread conforms to standard R8 specification
• Steel construction for durability under repeated clamping cycles
• Sold individually, compatible with standard R8-spindle drawbar assemblies

Compatibility

Designed as a standard R8-specification collet for use in vertical milling machines equipped with an R8 spindle taper and a 7/16-20 drawbar thread.

Installation Notes

Installation is performed by machinists or machine tool maintenance personnel. Power down and lock out the milling machine spindle before inserting or removing collets. Clean the spindle bore and collet taper with a lint-free cloth before installation to prevent damage to the taper surfaces. Engage the drawbar fully and torque by hand before final tightening with a wrench — do not overtighten, as this can damage the collet or spindle taper.