Value Collection 231-4708 R8 Round Collet 1/8 Inch

Product Description

The VALUE COLLECTION 231-4708 is a steel R8 round collet designed for use in milling machines and machining centers equipped with an R8 spindle taper. It holds 1/8-inch round shank tooling and features a 7/16-20 drawbar thread for secure tool retention. With a total indicator reading (TIR) of 0.0007 inches, it delivers the concentricity needed for accurate milling, drilling, and light boring operations. Machinists and tool room technicians install this collet when mounting small-diameter end mills, drill bits, or other 1/8-inch shank cutting tools in an R8-equipped machine.

This collet is suited for manual Bridgeport-style knee mills and compatible R8 spindle machines found in job shops, maintenance departments, and tool rooms. It is the correct choice when mounting 1/8-inch shank tooling where close runout control is required to maintain dimensional accuracy on finished surfaces. Sold individually, it is a direct, drop-in replacement for worn or damaged R8 collets of the same bore size.

Key Features

• 1/8-inch bore accepts standard 1/8-inch round shank tooling
• R8 taper profile fits R8 spindle machines
• 7/16-20 drawbar thread for secure engagement with machine drawbar
• 0.0007-inch TIR for consistent concentricity and dimensional accuracy
• Steel construction for durability under repeated clamping cycles

Compatibility

Designed as an OEM-style replacement for R8 spindle milling machines requiring a 1/8-inch bore collet with a 7/16-20 drawbar thread.

Installation Notes

Installation is performed by a machinist or qualified tool room technician. Before installing or removing a collet, ensure the machine spindle is fully stopped and the power is locked out. Clean the spindle taper and collet bore thoroughly before seating the collet to prevent runout caused by chips or debris. Engage the drawbar thread fully and tighten to the machine manufacturer's specification using the appropriate drawbar wrench.