Parlec 5UMER20-0354 ER20 Collet 0.3543 in 9mm

Product Description

The PARLEC 5UMER20-0354 is an ER20 series collet designed for precision tool holding in CNC machining centers, milling machines, and similar rotating spindle equipment. It accepts shank diameters up to 0.3543 inches (9.00 mm) with a minimum collet capacity of 0.315 inches (8.0 mm), giving it a usable clamping range suited to a wide variety of end mills, drills, and reamers. The collet delivers a Total Indicator Runout (TIR) of 0.0002 inches, making it appropriate for finishing operations and applications where tool concentricity directly affects surface finish and dimensional accuracy. Overall length is 1.24 inches and overall diameter is 0.827 inches.

ER20 collets are a standard in light-to-medium-duty CNC toolholding setups found in both job shop and production environments. This collet seats into any ER20-compatible collet chuck or toolholder and is commonly installed by machinists and CNC setup technicians. The compact ER20 form factor is well suited to benchtop machining centers, high-speed spindles, and tight-clearance operations where a larger collet series would interfere with the workpiece or fixture.

Key Features

• ER20 series collet with 0.3543 inch (9.00 mm) nominal collet size
• Clamping range from 0.315 inches (8.0 mm) up to 0.3543 inches (9.00 mm)
• 0.0002 inch TIR for high-concentricity tool holding
• 1.24 inch overall length fits standard ER20 collet chucks
• 0.827 inch overall diameter for compact spindle clearance
• Lightweight at 0.19 pounds for minimal added spindle mass

Compatibility

Designed as an OEM-style replacement or direct-fit collet for any ER20-compatible collet chuck or toolholder accepting the standard ER20 collet form factor.

Installation Notes

Installation is performed by qualified machinists or CNC setup technicians. Before inserting or removing the collet, ensure the spindle is fully stopped and the machine is locked out per facility lockout-tagout procedures. Seat the collet fully into the collet nut before threading onto the chuck body to avoid cross-threading or collet damage. Inspect the collet bore and chuck taper for chips or debris before each use, as contamination directly degrades TIR performance.