Accupro ER20HP 09.52 ER20 Collet 3/8 Inch

Product Description

The ACCUPRO ER20HP 09.52 is an ER20 series collet designed for use in CNC machining centers, milling machines, lathes, and other toolholding applications that accept the ER20 collet standard. It holds a 3/8-inch shank tool with a total indicator runout (TIR) of 0.0002 inches (0.0050 mm), making it well-suited for precision work where concentricity matters. The overall length is 31.5 mm. Machinists, toolroom technicians, and CNC operators use this collet as a direct replacement or standard stock component in high-volume production and job-shop environments.

This collet fits any ER20-compatible collet chuck or collet block, covering a broad range of benchtop and full-size CNC machining equipment. It is appropriate for residential shop setups, vocational training environments, and commercial production floors alike. The 3/8-inch bore size accommodates a wide variety of end mills, drills, reamers, and other round-shank tooling commonly used in metal, composite, and wood machining operations.

Key Features

• ER20 collet series — fits any ER20-compatible collet chuck or nut
• 3/8-inch bore accommodates standard round-shank cutting tools
• TIR of 0.0002 inches (0.0050 mm) for precision concentricity
• Overall length of 31.5 mm for proper ER20 chuck engagement
• Sold individually — single-piece packaging

Compatibility

Designed as an OEM-style replacement or standard-stock collet for use with ER20 collet chucks and collet blocks. Compatible with any toolholder or chuck machined to the ER20 collet standard.

Installation Notes

Installation is performed by machinists or toolroom technicians following standard toolholder procedures. Before inserting or removing a collet, ensure the spindle is fully stopped and the machine is powered down or in a safe lock-out state. Seat the collet fully into the ER20 collet nut before threading onto the chuck body, then tighten to the chuck manufacturer's torque specification using the appropriate ER20 spanner wrench. Inspect the collet bore and chuck taper for chips or debris before each use to maintain TIR performance.