Micro 100 ER11-125 ER11 Collet 1/8 Inch

Product Description

The MICRO 100 ER11-125 is an ER11 series collet designed to hold cutting tools and workholding shanks with a 0.125 inch (1/8 inch) bore diameter. Built for precision CNC machining and manual milling applications, this collet delivers a Total Indicator Runout (TIR) of 0.0004 inches, supporting tight-tolerance work in production and tool room environments. The ER11 form factor is one of the most widely used collet standards in small-spindle machining. Machinists and CNC operators rely on this collet for accurate, repeatable tool holding in high-speed spindles, collet chucks, and tapping heads. It does not include through-coolant capability.

The ER11-125 is suited for small-format CNC machining centers, benchtop mills, engraving machines, and tool grinders that accept ER11 collet chucks. The 1/8 inch bore size is commonly used to hold miniature end mills, drill blanks, carbide burrs, engraving cutters, and similar small-diameter rotary tooling. This collet is appropriate for production shops, tool and die operations, and precision machining setups where runout control and consistent clamping force are critical.

Key Features

• ER11 collet series - compatible with standard ER11 collet chucks and holders
• 0.125 inch (1/8 inch) bore diameter for small-diameter tooling
• TIR of 0.0004 inches for precision runout control
• No through-coolant configuration - suited for dry and flood coolant setups without axial coolant delivery
• Lightweight at 0.08 pounds - minimal spindle load contribution

Compatibility

Designed as a standard ER11 collet for use in any ER11-compatible collet chuck, spindle nose, or toolholder accepting the ER11 collet series.

Installation Notes

ER collets are installed and removed by a licensed machinist or qualified CNC technician using the appropriate ER11 collet nut and spanner wrench. Always confirm the spindle or chuck is fully stopped and de-energized before changing collets. Inspect the collet bore and taper surfaces for chips or damage before seating - contamination on the taper will directly degrade runout performance. Do not overtighten the collet nut beyond the chuck manufacturer's specified procedure, as this can distort the collet and reduce clamping accuracy.