Techniks 04208-3/16 ER8 Collet 3/16 Inch

Product Description

The TECHNIKS 04208-3/16 is an ER8 series collet sized at 3/16 inch (0.1875 inch decimal) designed for use in ER8-compatible collet chucks on CNC machining centers, milling machines, and high-speed spindles. It holds a 0.1875-inch diameter tool shank with a Total Indicator Runout (TIR) of 0.0002 inches, making it suitable for precision work where concentricity matters. The collet also features a through-coolant design, allowing coolant to pass directly through to the cutting tool for improved chip evacuation and tool life. Machinists and CNC operators install this collet as a direct component in toolholding setups.

This collet is used in machine shop environments, both job shops and production facilities, wherever ER8 toolholding systems are in service. The ER8 series is one of the smaller collet standards and is commonly found in high-speed spindle applications, engraving machines, and compact machining centers. The through-coolant feature makes this collet especially well-suited for deep-cavity milling or drilling operations where flood coolant alone does not reach the cutting zone effectively.

Key Features

• ER8 collet series for use with ER8-compatible collet chucks and toolholders
• 3/16 inch (0.1875 inch) collet bore size for matching tool shank diameter
• TIR of 0.0002 inches for precision concentricity in close-tolerance machining
• Through-coolant capable, directing coolant flow directly to the cutting edge
• Package quantity of 1 collet per unit

Compatibility

Designed for use with ER8-series collet chucks and spindle toolholders that accept the ER8 collet standard. Fits tool shanks of 0.1875 inches in diameter.

Installation Notes

Installation is performed by machinists or CNC setup technicians. The machine spindle must be fully stopped and locked out before installing or removing collets. Use the correct ER8 collet nut and a proper torque wrench or collet nut spanner rated for the ER8 nut size - do not use improvised tools that can damage the nut or collet seating surface. Inspect the collet bore and chuck taper for chips or debris before seating the collet to maintain TIR performance.