Value Collection 204-3220 ER32 Collet 5/16 Inch

Product Description

The VALUE COLLECTION 204-3220 is an ER32 series collet sized at 0.312 inches (5/16 inch) with a total indicator runout (TIR) of 0.0005 inches. ER collets are precision workholding components used in collet chucks mounted on milling machines, lathes, and machining centers. They grip cutting tools or workpieces with consistent clamping force and close concentricity, making them a standard choice for shops that require repeatable tool positioning. The 0.0005-inch TIR rating reflects the close tolerance held during manufacture, which is critical when running end mills, drills, or reamers at higher spindle speeds where runout directly affects surface finish and tool life.

This collet is suited for general-purpose CNC and manual machining applications in job shops, toolrooms, and production environments. It fits any ER32-standard collet chuck, which is one of the most widely used collet systems in the industry. Machinists and toolroom technicians typically reach for ER32 collets when setting up milling operations, light turning operations on a lathe with a collet chuck, or when holding round-shank tooling that requires a secure, concentric grip. The 5/16-inch bore accommodates commonly used tool shank sizes in both inch-dimensioned end mills and drill bits.

Key Features

• ER32 collet series — compatible with ER32-standard collet chucks
• 0.312-inch (5/16-inch) bore for common inch-shank tooling
• 0.0005-inch TIR for close concentricity and reduced runout
• Lightweight at 0.375 pounds for easy handling during tool changes
• Sold individually — one collet per package

Compatibility

Designed for use with ER32-standard collet chucks across CNC machining centers, manual mills, and lathes equipped with an ER32 chuck body. No specific machine model compatibility was provided in the product data.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Before inserting or removing the collet, ensure the spindle is fully stopped and the machine is powered down or in an e-stop state. Seat the collet into the chuck nut before threading the nut onto the chuck body — do not insert the collet directly into the chuck body without engaging it in the nut first, as this can damage the collet taper. Torque the collet nut using the appropriate ER32 spanner wrenches to achieve proper clamping; do not use pipe wrenches or improvised tools that can distort the nut.