Kennametal 1729862 Er Collet ER25 Series 0.5 Inch

Product Description

The KENNAMETAL 1729862 is an ER25 series ER collet designed for use in collet chuck toolholding systems on CNC machining centers, milling machines, and drill presses. This collet accepts a 0.5-inch (1/2-inch) shank diameter tooling and delivers a total indicator runout (TIR) of 0.0203 mm (0.000800 inch), providing the tight concentricity needed for precision cutting operations. With an overall length (OAL) of 34.01 mm and an overall diameter of 26.01 mm, it fits standard ER25 collet nut and chuck assemblies. Machinists and toolroom technicians rely on this collet for consistent tool grip and minimal runout in high-speed applications.

This collet is suited for use in both manual and CNC machine tool setups where ER25 toolholding systems are installed. Typical applications include end milling, drilling, reaming, and tapping operations in production and job-shop environments. The 0.5-inch bore size accommodates standard half-inch cutting tools and drill shanks commonly used in metalworking and manufacturing. It is appropriate for light to heavy-duty machining operations across a range of materials.

Key Features

• ER25 collet series for compatibility with standard ER25 chuck bodies and collet nuts
• 0.5-inch (1/2-inch) bore accepts standard half-inch shank tooling
• Low TIR of 0.0203 mm (0.000800 inch) supports precision and repeatability
• Overall length of 34.01 mm fits within standard ER25 chuck geometry
• Overall diameter of 26.01 mm conforms to ER25 collet envelope
• Sold individually — one collet per package

Compatibility

Designed as a direct-fit replacement for standard ER25 collet chuck systems accepting 0.5-inch bore collets. Use only in chuck bodies and collet nuts rated for the ER25 collet series.

Installation Notes

Installation and removal should be performed by a qualified machinist or toolroom technician. Ensure the machine spindle is fully powered down and the chuck body is clean and free of chips or debris before seating the collet. Use the appropriate ER25 collet nut and a calibrated torque wrench sized for the nut style — do not overtighten by hand or with impact tools. Inspect the collet and chuck bore for wear or damage before each use to maintain stated TIR performance.