Accupro ER25HP 04.76 ER25 Collet 3/16 Inch

Product Description

The ACCUPRO ER25HP 04.76 is an ER25 series collet designed to hold 3/16-inch round shank tooling in CNC machining centers, milling machines, and high-speed spindles. It delivers a total indicated runout (TIR) of 0.0002 inch (0.0050 mm), making it suitable for applications where tool concentricity directly affects surface finish and dimensional accuracy. The overall length is 34.0 mm. Machinists and CNC operators install this collet into compatible ER25 collet chucks or tool holders as part of standard workholding and toolholding setups in production and job-shop environments.

This collet is used in machine shops running CNC milling, drilling, tapping, and reaming operations that require a 3/16-inch tool bore. The ER25 series is a widely adopted standard, making this collet a common replacement or stocking item for shops maintaining a range of bore sizes across their toolholding inventory. It is appropriate for both light finishing passes and moderate material-removal operations where consistent tool grip and low runout are required.

Key Features

• ER25 collet series — fits standard ER25 chucks and tool holders
• 3/16-inch collet bore for round shank tooling
• TIR of 0.0002 inch (0.0050 mm) for precise tool concentricity
• Overall length of 34.0 mm
• Single-piece packaging — sold individually (quantity of 1)

Compatibility

Designed as an OEM-style replacement collet for use in any standard ER25 collet chuck or tool holder accepting the ER25 collet series with a 3/16-inch bore.

Installation Notes

Installation is performed by qualified machinists or CNC setup technicians. Power down and lock out the spindle before inserting or removing collets. Seat the collet into the chuck nut before threading onto the tool holder, and ensure the collet snaps into the nut retention groove before tightening. Clean the collet bore and chuck taper of chips and coolant residue before assembly to protect runout performance.