Value Collection 231-4732 R8 Collet 1/2 Inch Steel

Product Description

The VALUE COLLECTION 231-4732 is a 1/2 inch R8 collet machined from steel for use in milling machines equipped with an R8 spindle taper. It accepts 1/2 inch round shank tooling and secures via a 7/16-20 drawbar thread. The collet holds a total indicator runout (TIR) of 0.0007 inches, providing the concentricity needed for accurate milling, drilling, and boring operations. This type of collet is a standard consumable in machine shop environments and is typically installed and changed by machinists or tool room technicians during setup.

R8 collets are used in Bridgeport-style vertical knee mills and other milling machines built around the R8 spindle standard. This 1/2 inch size is suited for holding end mills, drill bits, reamers, and other 1/2 inch shank cutting tools. It fits into the spindle bore and is drawn up with a drawbar threaded to the 7/16-20 standard. Typical applications include general-purpose machining in job shops, maintenance facilities, and vocational or industrial training environments.

Key Features

• 1/2 inch bore diameter accepts standard 1/2 inch shank tooling
• R8 taper profile fits Bridgeport-style and compatible vertical milling machine spindles
• 7/16-20 drawbar thread matches the standard R8 drawbar specification
• 0.0007 inch TIR for reliable concentricity during cutting operations
• Steel construction for durability under normal milling loads

Compatibility

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

Installation Notes

Installation is performed by a machinist or tool room technician. Before changing collets, power down the milling machine and bring the spindle to a complete stop. Insert the collet into the spindle bore, load the cutting tool to the appropriate depth, and tighten the drawbar by hand before applying final torque with a wrench while holding the spindle brake. Avoid over-tightening the drawbar, as this can deform the collet bore and degrade runout performance over time.