Value Collection SC85606721 ER20 Collet Chuck 1 in Straight

Product Description

The VALUE COLLECTION SC85606721 is an ER20 collet chuck designed for precision toolholding in CNC machining centers, milling machines, and drill presses. It features a straight shank with a 1 inch shank diameter and delivers a Total Indicator Runout (TIR) of 0.0004 inches, making it suitable for applications where concentricity and repeatability are critical. The ER20 collet system is one of the most widely used standards in the industry, offering a broad range of collet sizes to accommodate various tool shank diameters. Machinists and toolroom technicians install this chuck as a direct interface between the spindle and cutting tool.

This collet chuck is intended for use in machine shops, production facilities, and toolroom environments running ER20-compatible spindles. It is well suited for light-to-medium milling, drilling, tapping, and reaming operations where low runout is required for part accuracy. The 1 inch projection and 3.75 inch overall length make it appropriate for standard reach applications without excessive overhang. Trade machinists, CNC setup technicians, and toolroom operators will find it fits standard ER20 collet nut assemblies available from multiple manufacturers.

Key Features

• ER20 collet system for broad collet size availability and industry-standard compatibility
• 0.0004 inch TIR for consistent concentricity in precision machining operations
• 1 inch straight shank diameter for direct spindle or toolholder installation
• 1 inch projection supports standard tool reach without excessive overhang
• 3.75 inch overall length suits typical vertical and horizontal machining center setups

Compatibility

Designed as a standard ER20 collet chuck compatible with ER20 collet nuts and ER20 series collets. Suitable for machine spindles and toolholders accepting a 1 inch straight shank.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Power down and lock out the machine spindle before mounting or removing the collet chuck. Use a calibrated torque wrench and the appropriate ER20 collet nut spanner to seat the collet nut properly — do not overtighten or use impact tools on the collet nut. Verify TIR with a dial test indicator after installation before resuming cutting operations.