Accupro 776918 ER40 Collet Nut

Product Description

The ACCUPRO 776918 is an ER40 collet nut designed to secure ER40 collets within compatible toolholders on CNC machining centers, milling machines, and lathes. The nut threads onto the toolholder nose and applies clamping force to the collet, locking the cutting tool in place during operation. This collet nut is built for standard ER40 collet series toolholding systems and does not include coolant-through capability. Machinists and toolroom technicians install and replace these nuts as part of routine toolholder maintenance or when thread wear reduces clamping reliability.

The ER40 collet nut is suited for use in production machine shops, job shops, and maintenance environments running ER40-series toolholding systems. It is a direct-fit component for any ER40-compatible toolholder that uses a standard ER40 retention nut. The nut is sold individually and is a common replacement item in high-cycle machining operations where collet nuts experience accelerated thread wear.

Key Features

• Designed for ER40 collet series toolholding systems
• Threads onto ER40-compatible toolholder noses to secure collets under load
• No coolant-through passages, suitable for dry or flood coolant setups where through-coolant is not required
• Sold as a single unit, allowing targeted replacement without purchasing a full kit
• Weighs 1 pound for reference in toolholder balance and logistics planning

Compatibility

Designed as an OEM-style replacement collet nut for ER40 collet series toolholding systems on CNC and manual machine tools that accept a standard ER40 retention nut.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Power down and lock out the machine spindle before replacing any toolholding components. Use a proper ER40 collet nut spanner wrench to tighten the nut to the toolholder manufacturer's recommended procedure. Do not use pipe wrenches or improvised tools, as this can damage the nut flats and affect runout.