Kennametal 1729936 ER40 Collet 0.5 Inch

Product Description

The KENNAMETAL 1729936 is an ER40 series collet designed for use in CNC machining centers, milling machines, and other rotating spindle equipment that accept the ER40 collet standard. This collet holds tooling at a nominal size of 0.5 inches (1/2 inch) with a minimum collet capacity of 0.46 inches, providing a controlled clamping range suitable for end mills, drills, reamers, and other round-shank cutting tools. The 1729936 delivers a total indicator runout (TIR) of 0.0203 mm (0.0008 inches), supporting accurate, repeatable tool holding for precision machining operations. Overall length is 1.811 inches (46 mm). Machinists and CNC setup technicians install this collet as part of routine tooling changes or spindle maintenance.

This collet is suited for production and job-shop environments running milling, boring, or drilling operations that require the ER40 collet standard. It is appropriate for both light and moderate-duty cutting applications where consistent TIR and reliable clamping force are required. Typical use cases include workpiece setups in vertical and horizontal machining centers, manual mills with ER40-compatible tool holders, and multi-axis CNC platforms. It is sold individually, making it practical as a direct replacement for a worn or damaged collet in an existing ER40 tool holder.

Key Features

• ER40 collet series — fits any ER40-standard collet chuck or tool holder
• 0.5 inch (1/2 inch) nominal collet size with a minimum capacity of 0.46 inches
• TIR of 0.0203 mm (0.0008 inches) for precise, repeatable tool positioning
• Overall length of 1.811 inches (46 mm) — standard ER40 profile
• Sold as a single unit, suitable for individual replacement or tooling inventory additions

Compatibility

Designed as an OEM-style replacement collet for use with ER40-standard collet chucks and tool holders accepting a 0.5 inch nominal collet size.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Before changing collets, ensure the spindle is fully stopped, the machine is in an e-stop or locked-out state, and the tool holder is removed from the spindle per the machine builder's procedure. Seat the collet fully into the nut before inserting tooling, and torque the collet nut using a calibrated ER collet wrench to the tool holder manufacturer's specified value. Inspect the collet bore and seating surface for chips or wear before installation to maintain TIR performance.