Techniks 41940 ER40 Slotted Collet Nut Through Coolant

Product Description

The TECHNIKS 41940 is a slotted collet nut designed for use with ER40 collet chucks in CNC machining applications. The slotted profile provides clearance for through-coolant delivery, directing cutting fluid directly to the tool tip for improved chip evacuation and tool life during high-speed milling, drilling, and tapping operations. Weighing 0.18 pounds, this nut is a direct-fit component for ER40 toolholding systems. It is installed and serviced by CNC machinists, tool crib technicians, and machine tool setup personnel.

This collet nut is suited for ER40 collet chuck assemblies used in machining centers, mills, and drill-tap machines where through-spindle or through-tool coolant is required. The through-coolant feature makes it appropriate for deep-hole drilling, high-feed milling, and other operations where flood coolant alone is insufficient. It is a commonly replaced wear item in production and job-shop environments.

Key Features

• Compatible with ER40 collet series toolholders
• Slotted design enables through-coolant delivery to the cutting tool
• Lightweight construction at 0.18 pounds
• Direct replacement for standard ER40 collet nuts in coolant-through setups

Compatibility

Designed as an OEM-style replacement collet nut for ER40 series collet chuck toolholding systems requiring through-coolant capability.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Ensure the spindle is fully stopped and the machine is in an e-stop or powered-down state before changing tooling. Use the appropriate ER40 spanner wrench to tighten the collet nut to the toolholder - do not use makeshift tools that can damage the nut slots. Verify coolant passages are clear and unobstructed before returning the assembly to service.