Accupro 776912 ER20 Collet Nut

Product Description

The ACCUPRO 776912 is an ER20 collet nut designed to secure ER20 series collets within compatible toolholders on CNC machining centers, milling machines, and drill presses. The nut threads onto the toolholder nose and applies uniform clamping force to seat the collet accurately and hold cutting tools at consistent runout. Machinists and CNC setup technicians install this component as a standard part of toolholder assembly. It is a direct replacement or spare for any ER20 toolholder system that uses a standard ER20 retention nut.

This collet nut is suited for production machining environments where ER20 toolholders are in regular rotation. It is appropriate for both light-duty and general-purpose milling, drilling, and reaming operations using ER20 collets. The ER20 collet series accommodates a range of shank diameters, making this nut a commonly stocked consumable in shops running multiple tool diameters through a single toolholder platform.

Key Features

• Designed specifically for the ER20 collet series for accurate collet retention
• Threads onto standard ER20 toolholder nose for secure tool clamping
• Compact, single-piece design with no additional hardware required
• Weighs 1 pound, keeping toolholder assembly mass low
• Sold individually, allowing single-unit replacement without overstocking

Compatibility

Designed as an OEM-style replacement nut for ER20 series collet toolholders used in CNC machining and manual milling applications.

Installation Notes

Installation is performed by machinists or CNC toolroom technicians during toolholder setup or collet replacement. Ensure the spindle is fully stopped and the machine is in an e-stop or powered-down state before changing tooling. Use an ER20 collet nut spanner wrench to tighten to the toolholder manufacturer's specified torque range — do not use improvised tools, as overtightening can distort the collet and undermine runout accuracy. Inspect the nut threads for wear or damage before each use.