Accupro ER25HP 12.7 Er Collet 1/2 Inch ER25

Product Description

The ACCUPRO ER25HP 12.7 is an ER-style collet sized at 1/2 inch, designed for use with ER25 collet chucks on CNC machining centers, lathes, and manual milling machines. This collet grips round-shank cutting tools and workpieces with a Total Indicator Runout (TIR) of 0.0002 inches (0.005 mm), making it suitable for precision-critical operations where concentricity directly affects surface finish and tool life. Machinists and tool-room technicians install and replace these collets as part of routine tooling maintenance or when expanding a shop's bore capacity range.

The ER25HP 12.7 fits standard ER25 collet chucks and is appropriate for both production and maintenance machining environments. The ER25 collet series is one of the most widely used standards in CNC and manual toolholding, covering a broad range of shank diameters. This 1/2-inch collet is a common size used for end mills, drills, and reamers with 1/2-inch shanks. It suits light-duty to medium-duty cutting applications in ferrous and non-ferrous materials across job shops, maintenance facilities, and production lines.

Key Features

• 1/2-inch collet bore fits standard 1/2-inch round-shank tooling
• ER25 collet series for use in ER25-compliant chucks
• TIR of 0.0002 inches (0.005 mm) for precision concentricity
• Compact form factor: approximately 1.23 inches in height and 1 inch in width
• Lightweight at 0.35 pounds for easy handling and quick tool changes

Compatibility

Designed for use with ER25-standard collet chucks. No specific compatible chuck models or machines were named in the product data; confirm chuck series compatibility before installation.

Installation Notes

ER collets are installed and removed by a qualified machinist or toolroom technician using the appropriate ER25 collet nut and spanner wrench. Always de-energize and lock out the spindle before changing collets. Inspect the collet bore and chuck taper for chips or debris prior to seating the collet, as contamination directly impacts TIR. Do not exceed the collet's rated clamping range or use a collet with a shank diameter outside its specified grip range.