Kennametal 1729855 ER25 Collet 0.1875 Inch

Product Description

The KENNAMETAL 1729855 is an ER25 series collet designed for precision workholding in CNC machining, milling, and drilling applications. It accepts a nominal collet size of 0.1875 inches (3/16 inch) with a minimum collet capacity of 0.1475 inches, providing a defined clamping range suitable for small-diameter tooling. The collet delivers a total indicator runout (TIR) of 0.0152 mm (0.0006 inches), making it appropriate for applications where concentricity and tool accuracy are critical. Overall length is 1.339 inches (34.01 mm). This collet is installed by machinists and toolroom technicians working with ER25-compatible spindles and toolholders.

The 1729855 is suited for use in vertical and horizontal machining centers, CNC mills, and drill presses equipped with ER25 collet chuck systems. It is commonly used in production and job-shop environments where small-diameter end mills, drills, reamers, or taps need secure, repeatable clamping. The low TIR specification makes it a reliable choice for finishing operations and precision boring where tool runout directly affects surface quality and dimensional accuracy.

Key Features

• ER25 collet series for use with standard ER25 collet chucks and holders
• Nominal collet size of 0.1875 inches (3/16 inch) with minimum capacity of 0.1475 inches
• Low TIR of 0.0152 mm (0.0006 inches) for high concentricity and accurate tool positioning
• Overall length of 1.339 inches (34.01 mm) for compatibility with standard ER25 nut depths
• Lightweight construction at 0.1543 pounds for easy handling and quick changeouts

Compatibility

Designed as an OEM-style replacement collet for use with ER25-series collet chucks and toolholders accepting the ER25 collet standard.

Installation Notes

Installation is performed by machinists or toolroom technicians. Before inserting or removing the collet, ensure the machine spindle is powered down and all motion has stopped. Seat the collet fully into the ER25 nut before threading onto the chuck body, and tighten using an appropriate ER collet wrench to the chuck manufacturer's specified procedure. Do not overtighten the collet nut, as this can distort the collet bore and increase runout.