Value Collection SC84904721 ER16 Collet Locknut

Product Description

The VALUE COLLECTION SC84904721 is an ER16 collet locknut designed to secure ER16 series collets in CNC machining centers, milling machines, and similar rotating spindle applications. The locknut threads onto the collet chuck nose and applies the clamping force needed to hold the collet and cutting tool at the correct depth. It measures 1.18 inches in diameter and 0.71 inches in height and weighs approximately 0.11 pounds, making it a compact, lightweight component suited for high-speed spindle work. This part does not support coolant-through configurations.

ER16 locknuts are used wherever ER16-series collet chucks are installed, including CNC lathes, milling machines, drill presses, and router spindles found in machine shops and production environments. The ER16 collet system is one of the most widely used toolholding standards in the industry, and this locknut is a direct-fit component for any chuck body accepting the ER16 nut thread specification. Machinists, toolroom technicians, and CNC setup operators typically handle installation and replacement of this component.

Key Features

• Fits ER16 collet series for broad compatibility across ER16-standard chuck bodies
• Compact profile at 1.18 inches wide and 0.71 inches tall
• Lightweight at approximately 0.11 pounds for minimal spindle load impact
• No coolant-through design — suitable for dry and flood coolant external applications
• Sold individually, quantity of one per package

Compatibility

Designed as a direct replacement locknut for ER16-series collet chuck systems. Compatible with any collet chuck body machined to the ER16 locknut thread standard.

Installation Notes

Installation and replacement should be performed by a qualified machinist or CNC toolroom technician. Power down and lock out the spindle drive before removing or installing any toolholding components. Use the appropriate ER16 spanner wrench to torque the locknut evenly against the collet — never use improvised tools that could damage the nut face or collet taper. Inspect the collet seating surface and chuck bore for debris or damage before assembly.