Parlec M50TRK Retention Knob CAT50 1-8 Thread

Product Description

The PARLEC M50TRK is a CAT50 retention knob designed to secure toolholders in CAT50 spindle tapers on CNC machining centers. It features a 1-8 inch thread, a 45-degree angle radius, and a through-coolant passage with a 0.468-inch coolant hole diameter for directed coolant delivery to the cutting zone. The knob measures 1.14 inches in diameter at the knob, 1.031 inches at the pilot, and 0.82 inches at the neck, with an overall length of 2.3 inches. Licensed machinists and CNC setup technicians install this component as part of routine toolholder changeouts and spindle maintenance in production machining environments.

The M50TRK is suited for CAT50 toolholder assemblies in high-production CNC milling and machining center applications where consistent drawbar pull force and coolant-through capability are required. The Style A configuration and 45-degree angle radius match standard CAT50 toolholder geometries used in horizontal and vertical machining centers. The 0.2-inch flange thickness and 1.0-inch knob-to-flange length conform to typical CAT50 spindle specifications for reliable clamping and repeatable tool seating.

Key Features

• CAT50 taper size for direct compatibility with CAT50 spindle toolholders
• 1-8 inch thread for secure drawbar engagement
• 45-degree angle radius matches standard CAT50 retention knob geometry
• Through-coolant design with 0.468-inch coolant hole diameter
• Style A configuration for broad CAT50 toolholder fitment
• 1.14-inch knob diameter and 1.031-inch pilot diameter for positive spindle location

Compatibility

Designed as an OEM-style replacement retention knob for CAT50 toolholder assemblies used with CAT50-taper CNC machining center spindles.

Installation Notes

Retention knobs are installed and removed by qualified CNC machinists or toolroom technicians using a retention knob wrench sized for the 1-8 thread. Drawbar tension must be verified after installation per the machine tool manufacturer specifications. Always confirm the spindle is fully de-energized and the drawbar is released before removing or installing any retention knob. Do not overtighten, as improper torque can damage the toolholder taper or affect spindle runout.