Lyndex-nikken 800-028 R8 Collet 7/16 Inch Steel

Product Description

The LYNDEX-NIKKEN 800-028 is a steel R8 collet designed for use in milling machines equipped with an R8 spindle taper. It accepts a 7/16 inch tool shank and features a 7/16-20 drawbar thread for secure engagement with the machine spindle. With a total indicator runout (TIR) of 0.0011 inch, this collet delivers the concentricity required for accurate machining operations. Weighing 0.54 pounds, it is a solid, precisely manufactured workholding component intended for installation by machinists and CNC toolroom technicians.

This collet is suited for vertical milling machines and manual knee mills that use the R8 spindle interface, a standard found widely in Bridgeport-style and comparable knee mill platforms. It is appropriate for both production shop and toolroom environments where consistent tool runout and repeatable clamping are required. The 7/16 inch bore size makes it a direct fit for end mills, drills, and other shank tooling of that diameter.

Key Features

• R8 taper interface for compatibility with R8 spindle milling machines
• 0.0011 inch TIR for high concentricity and accurate tool positioning
• 7/16-20 drawbar thread for positive spindle retention
• 7/16 inch bore accepts standard shank tooling of that diameter
• Steel construction for durability and resistance to deformation under clamping load

Compatibility

Designed as an OEM-style replacement or direct-fit collet for milling machines with an R8 spindle taper requiring a 7/16 inch tool shank collet and 7/16-20 drawbar thread.

Installation Notes

R8 collets are installed and removed by a qualified machinist or toolroom technician. Always power down and lock out the machine spindle before changing collets. Insert the collet into the spindle bore, align the keyway slot, and engage the drawbar thread by hand before tightening with appropriate tooling. Do not overtighten the drawbar, as this can damage the collet bore or spindle threads.