Parlec 5UMER16-0250 ER16 Collet 0.25 Inch

Product Description

The PARLEC 5UMER16-0250 is an ER16 series precision collet sized for a 0.25 inch (1/4 inch) tool shank. It delivers a Total Indicator Runout (TIR) of 0.0002 inches, making it suitable for tight-tolerance milling, drilling, and tapping operations on CNC machining centers and manual mills. The collet measures 1.082 inches in overall length and 0.669 inches in overall diameter. At 0.06 pounds, it is a compact, lightweight workholding component. Machinists and tool-room technicians install these collets as part of standard ER collet chuck assemblies to secure cutting tools during rotating operations.

This collet is used in light-to-medium duty machining applications where a 1/4 inch tool shank must be held with precision and repeatability. Typical install scenarios include CNC vertical machining centers, drilling stations, and tapping setups that use ER16-compatible collet chucks. The 0.0002 inch TIR supports close-tolerance operations where runout directly affects surface finish and tool life. Minimum collet capacity for this unit is 0.211 inches, allowing it to grip tools slightly undersized from its nominal 0.25 inch rating.

Key Features

• ER16 collet series for use with standard ER16 collet chuck bodies
• 0.25 inch nominal collet size with 0.211 inch minimum collet capacity
• 0.0002 inch TIR for high-precision, low-runout tool holding
• 1.082 inch overall length fits standard ER16 chuck depth
• 0.669 inch overall diameter - compact profile for tight workspaces
• Lightweight at 0.06 pounds for minimal spindle load

Compatibility

Designed for use with ER16-compatible collet chuck bodies and toolholders that accept the ER16 collet series.

Installation Notes

Installation is performed by a machinist or toolroom technician. Before installing or changing collets, ensure the spindle is fully stopped and locked out per your machine tool safety procedures. Seat the collet fully into the nut before threading onto the chuck body to prevent cross-threading or collet damage. Torque the collet nut using an appropriate ER collet nut spanner wrench - do not use pipe wrenches or improvised tools that may damage the nut or collet.