Accupro 784770 ER25 Collet 0.403 Inch

Product Description

The ACCUPRO 784770 is an ER25 series collet designed for use in CNC machining centers, milling machines, and other rotating spindle equipment that accept ER25 toolholding systems. With a collet size of 0.403 inches and a minimum collet capacity of 0.375 inches, this collet provides a secure clamping range suited for round shank cutting tools within that span. The overall length is 1.378 inches (35 millimeters). Weighing 0.2 pounds, it is a compact, precision-ground component intended for installation by machinists and toolroom technicians working with ER-style collet chucks.

This collet is used in production and job-shop environments where ER25 collet chucks are the standard toolholding interface. It is appropriate for milling, drilling, reaming, and tapping operations on vertical and horizontal machining centers. The 0.403-inch bore accommodates tooling at or just below that diameter, making it a practical choice when working with non-standard or metric-adjacent shank sizes that fall within the stated clamping range.

Key Features

• ER25 collet series for compatibility with ER25 collet chucks
• 0.403-inch collet size with a minimum collet capacity of 0.375 inches
• Overall length of 1.378 inches (35 millimeters)
• Lightweight at 0.2 pounds for easy handling during tool changes
• Suitable for milling, drilling, reaming, and tapping applications

Compatibility

Designed for use with ER25 collet chucks and ER25 toolholding systems. Specific machine or chuck model compatibility was not provided in the product data; verify that your chuck accepts the ER25 collet standard before installation.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician familiar with ER-style collet systems. Before inserting or removing the collet, ensure the spindle is fully stopped and the machine is powered down or placed in a safe lockout state. Seat the collet into the nut before threading onto the chuck body, and tighten to the chuck manufacturer's specified torque using the appropriate ER25 collet wrench. Inspect the collet bore and chuck taper for chips or damage before each use to maintain runout accuracy.