Value Collection SC84904564 ER20 Collet Chuck

Product Description

The VALUE COLLECTION SC84904564 is an ER20 collet chuck designed for use with ER-series collets in machining and toolholding applications. It accepts a clamping range of 0.039 to 0.512 inches, covering a wide variety of tool shank sizes within the ER20 collet series. The chuck features a 1-inch straight shank measuring 7.2 inches in length and delivers a total indicator runout (TIR) of 0.0004 inches, making it suitable for precision milling, drilling, and light contouring operations. Actuation is accomplished with a standard collet wrench engaging the included lock nut. Machinists and CNC setup technicians are the primary installers of this toolholder.

This collet chuck is used in CNC machining centers, vertical mills, and manual milling machines that accept a 1-inch straight shank toolholder. The ER20 collet system is a widely adopted standard, and this chuck accommodates the full ER20 collet range to hold end mills, drills, reamers, and taps within its stated capacity window. It is suited for production and job-shop environments where consistent toolholding and low runout are required across moderate to high spindle speeds.

Key Features

• ER20 collet system compatibility covers 0.039 to 0.512 inch tool shank range
• 0.0004 inch TIR for precise, repeatable tool concentricity
• 1-inch straight shank with 7.2 inch shank length for deep-reach or extended-gage applications
• Wrench-actuated collet nut with 1.1 inch nut diameter for positive clamping
• No through-coolant configuration keeps design simple and maintenance low

Compatibility

Designed as a standard ER20 straight-shank collet chuck for use with ER20 collets in machines accepting a 1-inch straight shank toolholder bore.

Installation Notes

Installation should be performed by a qualified machinist or CNC technician. Power down and lock out the machine spindle before inserting or removing any toolholder. Use the appropriate ER20 collet wrench and spanner to tighten the lock nut to the machine or toolholder manufacturer's specified procedure — do not overtighten or use impact tools on the collet nut. Inspect the collet, nut, and chuck bore for chips or damage before each installation to maintain runout performance.