Accupro 784913 ER20 Collet 0.188 Inch

Product Description

The ACCUPRO 784913 is an ER20 series collet designed for use in CNC machining centers, milling machines, and compatible toolholding systems. It accepts a collet size of 0.188 inches (decimal) with a minimum collet capacity of 0.172 inches, making it suited for securing small-diameter cutting tools with consistent clamping force. The collet measures approximately 1.9 inches in height and 1.2 inches in width and length, with an overall package weight of 0.05 pounds. Machinists and toolroom technicians install this collet as part of an ER20 toolholding chuck assembly to ensure accurate tool runout and repeatable positioning during precision cutting operations.

This collet is used in machine shop environments for light to medium milling, drilling, and boring operations where ER20 toolholding standards apply. The 0.188-inch capacity is commonly paired with fractional and metric shank cutting tools within its clamping range. It is appropriate for both production and job-shop applications where a reliable, standardized collet interface is required. Installation is performed by trained machinists or toolroom personnel during tool setup and changeover.

Key Features

• ER20 collet series for compatibility with ER20 chuck bodies and toolholders
• 0.188-inch collet size with a minimum capacity of 0.172 inches for small-diameter tooling
• Compact form factor: 1.9 inches height, 1.2 inches width, 1.2 inches length
• Lightweight at 0.05 pounds for easy handling during tool changes
• Single-piece package quantity suitable for individual tooling setups

Compatibility

Designed as an OEM-style replacement collet for use with ER20 series collet chuck bodies and toolholding systems that accept the ER20 standard.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician with the machine spindle fully powered down and locked out per applicable safety procedures. The collet should be seated properly in the ER20 chuck body before the retention nut is engaged. Inspect the collet bore and chuck taper for debris or damage before installation to avoid runout issues. Follow the machine manufacturer guidelines for torque and clamping procedures specific to the chuck assembly in use.