Accupro ER11HP 06.35 Er Collet 0.25 in ER11

Product Description

The ACCUPRO ER11HP 06.35 is a precision ER11-series collet designed for use in CNC machining centers, milling machines, and high-speed spindle toolholding systems. With a collet bore size of 0.25 inches and a total indicator runout (TIR) of 0.0002 inches (0.0050 mm), this collet delivers the tight tolerances required for precision cutting, drilling, and finishing operations. Manufactured to ER11 standards, it fits ER11 collet chucks and holders across a wide range of machine tool platforms. Machinists and CNC operators rely on consistent TIR performance to maintain part accuracy and extend tool life.

This collet is suited for light-duty to medium-duty machining applications including drilling, reaming, tapping, and end milling in both production and job-shop environments. The ER11 series is among the most widely used collet standards in precision machining, making this collet a common replacement or spare in shops running smaller-diameter tooling. It is appropriate for both manual and CNC-controlled spindles where ER11 toolholding is specified.

Key Features

• Collet bore size of 0.25 inches for standard quarter-inch shank tooling
• TIR of 0.0002 inches (0.0050 mm) for high-precision runout control
• ER11 collet series — one of the most common precision toolholding standards
• Compact form factor: approximately 1.23 inches tall and 1 inch in diameter
• Lightweight at 0.35 pounds for easy handling and storage

Compatibility

Designed as an OEM-style replacement or spare collet for machine tool spindles and toolholders built to the ER11 collet standard.

Installation Notes

ER collets are installed by qualified machinists or CNC setup technicians. Always power down and lock out the spindle before changing collets. Use the correct ER11 collet nut and spanner wrench rated for the holder — do not substitute collet nuts from other ER series. Inspect the collet bore and chuck taper for chips or debris before seating, and verify TIR with a dial indicator after installation.