Seco 75069986 ER25 Collet Nut

Product Description

The SECO 75069986 is an ER25 collet nut designed for use with ER25 collet chucks in CNC machining and manual milling applications. The collet nut threads onto the collet chuck body and applies clamping force to seat the collet securely, maintaining tool concentricity during cutting operations. At 1 pound, it is a direct replacement component suited for shops and tool crib managers sourcing individual nuts rather than full chuck assemblies. Installation requires a standard ER25 spanner wrench and proper torque technique to avoid thread damage or collet distortion.

This collet nut is used wherever an ER25 toolholding system is in service, including CNC machining centers, manual mills, lathes with live tooling, and bench-top drilling setups. It is a common replacement item when threads show wear, when a nut is lost, or when a spare is needed to reduce downtime during tool changes. No coolant-through capability is present on this nut, making it appropriate for standard dry or flood-coolant setups where internal coolant delivery through the nut is not required.

Key Features

• ER25 collet series compatibility for broad toolholder fitment
• No coolant-through design suits standard flood and dry machining environments
• Sold individually, allowing single-unit replacement without purchasing a full assembly
• Lightweight at 1 pound for easy handling and tool crib stocking

Compatibility

Designed as an OEM-style replacement collet nut for ER25 series collet chuck systems.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Always power down and lock out the machine spindle before removing or installing a collet nut. Use a proper ER25 spanner wrench rather than improvised tools to avoid rounding the nut flats or cross-threading. Inspect collet and chuck threads for wear or contamination before installing the replacement nut.