Parlec ER16-0250 ER16 Collet 1/4 Inch

Product Description

The PARLEC ER16-0250 is an ER16 series collet sized for a 0.25 inch (1/4 inch) nominal clamping diameter. It measures 1.082 inches in overall length with an overall diameter of 0.669 inches. ER16 collets are precision workholding components used in CNC machining centers, milling machines, and toolholding chucks that accept the ER16 taper. The collet grips cutting tools, drill bits, and round-shank tooling by compressing radially when tightened into a compatible nut and chuck body. Machinists and CNC setup technicians install and replace these collets as part of routine toolholding maintenance or when changing tool shank sizes.

This collet is suited for light to medium-duty machining applications where the ER16 collet system is the specified toolholding standard. Common installation environments include manual knee mills, benchtop CNC routers, small-footprint vertical machining centers, and collet chuck setups on CNC lathes equipped with ER16-compatible tooling blocks. The 1/4 inch size is one of the most frequently used in the ER16 range, making it a standard stocking item for shops running small-diameter end mills, reamers, and drill bits.

Key Features

• ER16 collet series with 0.25 inch nominal collet size
• Minimum collet capacity of 0.211 inches allows a clamping range within the ER16 standard
• Overall length of 1.082 inches fits standard ER16 chuck bodies
• Overall diameter of 0.669 inches conforms to ER16 taper geometry
• Lightweight at 0.06 pounds - minimal added mass to spindle assembly

Compatibility

Designed as an OEM-style replacement or standard toolholding collet for use with ER16-series collet chucks and nuts.

Installation Notes

ER16 collets are installed by a machinist or CNC technician. Always power down and lock out the machine spindle before changing collets. Insert the collet into the collet nut before threading the nut onto the chuck body - never tighten a collet nut onto the chuck without the collet seated first, as this can damage the nut and chuck threads. Inspect the collet bore and taper surfaces for chips or debris before each use to maintain runout accuracy.