Accupro 784895 ER20 Collet Set 12 Pc 1/2 in

Product Description

The ACCUPRO 784895 is a 12-piece ER20 collet set designed for use in CNC machining centers, milling machines, and drill presses equipped with ER20 toolholders. The set covers a range of shank sizes from 0.1563 inches up to 0.5000 inches, giving machinists a complete set of collets in a single purchase. Each collet in the set holds to a total indicator runout (TIR) of 0.02 mm, supporting accurate, repeatable tool holding across a wide range of cutting and drilling operations. The ER20 series is a common industry-standard collet system compatible with coolant-through applications.

This set is suited for machine shops, toolrooms, and production environments running ER20 toolholder systems. It is appropriate for both light production and prototype work where consistent tool concentricity is required. The 12-piece configuration covers fractional inch shank sizes including 5/32, 3/16, 7/32, 1/4, 9/32, 5/16, 11/32, 3/8, 13/32, 7/16, 15/32, and 1/2 inch, making it a practical all-in-one solution for shops that run varied tooling diameters.

Key Features

• 12-piece set covers shank sizes from 0.1563 inches to 0.5000 inches
• ER20 series collet system, compatible with coolant-through toolholders
• 0.02 mm TIR for accurate, repeatable tool holding
• Fractional inch sizing across all 12 collets for broad tooling coverage
• Set weight of 1.5 pounds for easy bench or toolroom storage

Compatibility

Designed for use with ER20-series collet chucks and toolholders. Fits any standard ER20 toolholder accepting collets with a maximum shank capacity of 1/2 inch.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians familiar with ER collet systems. Before changing collets, ensure the spindle is fully stopped and the machine is powered down or the e-stop is engaged per shop safety procedures. Use the appropriate ER20 collet nut and spanner wrench to seat and torque the collet nut — refer to the toolholder manufacturer specifications for clamping torque. Inspect each collet for nicks or deformation before use, as damaged collets can affect TIR and tool retention.