Value Collection 231-4724 R8 Round Collet 3/8 Inch

Product Description

The VALUE COLLECTION 231-4724 is a 3/8 inch R8 round collet machined from steel for use in milling machines and machining centers equipped with an R8 spindle taper. It accepts a 7/16-20 drawbar thread and holds 3/8 inch round shank tooling. The collet is rated to a total indicated runout (TIR) of 0.0007 inches, making it suitable for applications where concentricity and tool accuracy are critical. This type of collet is a standard consumable in machine shop environments and is installed by machinists, tool and die workers, and CNC operators.

R8 collets are used in knee mills and vertical milling machines that use the R8 spindle standard, a format common in light-duty and general-purpose machining operations in both job shops and maintenance facilities. This collet holds 3/8 inch round shank end mills, drills, and similar tooling. It is a direct-fit component for any machine tool configured with an R8 spindle and a 7/16-20 drawbar.

Key Features

• 3/8 inch bore accepts standard round shank tooling of that diameter
• R8 taper profile fits machines with the R8 spindle standard
• 7/16-20 drawbar thread for secure engagement with the machine spindle
• 0.0007 inch TIR rating supports accurate, repeatable tool holding
• Steel construction for durability under milling loads

Compatibility

Designed as a standard R8 round collet replacement for milling machines and machining centers equipped with an R8 spindle taper and a 7/16-20 drawbar thread.

Installation Notes

Installation is performed by machinists or machine tool operators. Always power down and de-energize the machine spindle before inserting or removing a collet. The drawbar must be threaded in fully and torqued to the machine manufacturer's specification to prevent tool pullout during cutting. Inspect the collet bore and spindle taper for chips or debris before installation, as contamination will increase runout beyond the rated TIR.