Accupro 776910 ER16 Collet Nut

Product Description

The ACCUPRO 776910 is an ER16 collet nut used to secure ER16 collets within a compatible toolholder. It threads onto the toolholder nose and applies clamping force to the collet, locking the cutting tool in place during machining operations. This nut is a standard component in ER16 toolholder assemblies and is used on CNC machining centers, milling machines, and drilling setups. Machinists and tool crib technicians install and replace collet nuts as part of routine toolholder maintenance. This part does not support coolant-through configurations.

The 776910 is suited for use in shops running ER16 collet toolholders across light to medium-duty milling, drilling, and tapping applications. ER16 collets accommodate smaller shank diameters, making this nut common in precision work cells and high-speed spindle setups. It is sold individually and is a direct drop-in replacement when a worn or damaged collet nut needs to be swapped out without replacing the entire toolholder assembly.

Key Features

• Designed for ER16 collet series toolholders
• Applies uniform clamping force to secure the collet and cutting tool
• No coolant-through passages — compatible with dry and flood coolant setups where coolant-through is not required
• Sold as a single unit for targeted replacement
• Weighs 1 pound

Compatibility

Designed as a standard replacement collet nut for ER16 series toolholders. Compatible with any toolholder using the ER16 collet system standard.

Installation Notes

Installation and removal should be performed with the proper ER collet nut spanner wrench to avoid damaging the nut or toolholder threads. Always verify the collet is seated correctly in the nut before threading the assembly onto the toolholder. Ensure the spindle or toolholder is secured and the machine is powered down or in a safe state before changing tooling. Over-tightening the collet nut can distort the collet bore and reduce tool-holding accuracy.