Iscar 4500238 ER32 Collet 0.75 in 0.0004 Tir

Product Description

The ISCAR 4500238 is an ER32 series collet designed for use in ER32-compatible collet chucks on CNC machining centers, milling machines, and other rotating spindle equipment. This collet accepts a 0.75 inch (3/4 inch) shank diameter tooling and holds a total indicator runout (TIR) of 0.0004 inches, supporting close-tolerance work where concentricity directly affects surface finish and tool life. The ER32 collet format is one of the most widely adopted clamping standards in precision machining, and this unit is sized for common end mills, drills, and reamers running at that shank diameter. Installation is performed by qualified machinists or toolroom technicians.

This collet is suited for production and job-shop environments running ER32 collet chucks in vertical or horizontal machining centers, CNC routers, tapping heads, and grinding spindles. It is appropriate for both roughing and finishing applications where a 0.75 inch tool shank is required. The 0.0004 inch TIR rating makes it a reliable choice when runout must be kept tight to maintain dimensional accuracy across a production run.

Key Features

• ER32 collet series — fits any ER32-standard collet chuck
• 0.75 inch (3/4 inch) clamping diameter for standard shank tooling
• 0.0004 inch TIR for close-tolerance concentricity
• Lightweight at 1 pound, suitable for high-speed spindle use
• UNSPSC Code 27112800 — classified as a workholding collet

Compatibility

Designed as an OEM-style replacement collet for use in ER32-standard collet chucks across CNC milling, drilling, and routing applications requiring a 0.75 inch clamping diameter.

Installation Notes

ER32 collets are installed and removed by qualified machinists using the appropriate ER32 collet nut and spanner wrench. Always ensure the spindle is fully stopped and the machine is locked out before changing collets. Inspect the collet bore and chuck taper for chips or contamination before seating the collet, as debris will directly increase runout beyond the rated TIR. Follow the machine tool manufacturer torque guidelines for the collet nut — do not use impact tools to tighten.