Parlec TOY050TRK Retention Knob CAT50 1-8 Thread

Product Description

The PARLEC TOY050TRK is a CAT50 retention knob designed to secure toolholders in CAT50 spindle tapers on CNC machining centers. It features a 1-8 UNC thread for positive engagement with the drawbar, a 45-degree angle radius, and through-coolant capability with a 0.236-inch coolant hole diameter. The Style I knob measures 3.355 inches overall length with a 0.905-inch knob diameter, making it a direct-fit component for high-speed machining applications where secure tool retention and coolant delivery are both required. Licensed machinists and CNC setup technicians are the primary installers of this component.

This retention knob is used in CAT50 toolholding systems on vertical and horizontal machining centers in production and job-shop environments. The through-coolant design supports applications where directed coolant flow through the toolholder to the cutting tool is needed, such as drilling, reaming, or tapping operations with coolant-through toolholders. It fits CAT50 spindle configurations requiring a 1-8 thread drawbar engagement and a 1.031-inch pilot diameter interface.

Key Features

• CAT50 taper size for use with CAT50 spindle toolholding systems
• 1-8 UNC thread for drawbar engagement
• Through-coolant capable with 0.236-inch coolant hole diameter
• 45-degree angle radius for consistent seating and retention force
• Style I configuration with 0.905-inch knob diameter and 1.031-inch pilot diameter
• Compact neck diameter of 0.670 inches reduces interference risk during toolchange

Compatibility

Designed for use with CAT50 toolholders requiring a 1-8 UNC threaded retention knob with a 1.031-inch pilot diameter and through-coolant passage, in machining centers equipped with CAT50 spindle tapers.

Installation Notes

Retention knobs should be installed and torqued by a qualified machinist or CNC toolroom technician using an appropriate retention knob wrench. Always remove the toolholder from the spindle and ensure the machine is in a safe, powered-down state before servicing retention knobs. Do not use pipe wrenches or improvised tools on the knob body, as this can damage the seating surfaces. Inspect threads on both the retention knob and drawbar for wear or damage before installation.