Parlec MAK050TRK Retention Knob CAT50 1-8 Thread

Product Description

The PARLEC MAK050TRK is a CAT50 retention knob designed to secure toolholders in CAT50 spindle tapers on CNC machining centers. It threads into the drawbar mechanism at a 1-8 thread pitch, pulling the toolholder firmly into the spindle taper for rigid, repeatable tool clamping. The knob features a 45-degree angle radius, a knob diameter of 0.904 inches, and a neck diameter of 0.667 inches. A through-coolant passage with a 0.236-inch coolant hole diameter allows coolant to flow directly through the toolholder when paired with a compatible through-coolant system. Installed and serviced by CNC machine operators and tooling setup technicians.

This retention knob is intended for use in CAT50 toolholder assemblies on vertical and horizontal machining centers equipped with CAT50 spindles. It is suited for production environments running heavy cutting operations where consistent drawbar clamping force and through-coolant capability are required. The overall assembly length of 3.14 inches and knob-to-flange length of 1.78 inches are sized to standard CAT50 toolholder specifications.

Key Features

• CAT50 taper size for compatibility with standard CAT50 spindle toolholders
• 1-8 thread pitch for drawbar engagement
• 45-degree angle radius for proper seating and clamping geometry
• Through-coolant capable with a 0.236-inch coolant hole diameter
• Knob diameter of 0.904 inches and neck diameter of 0.667 inches
• Overall length of 3.14 inches with a knob-to-flange length of 1.78 inches

Compatibility

Designed as an OEM-style replacement retention knob for CAT50 toolholders used in CNC machining center spindles requiring a 1-8 drawbar thread.

Installation Notes

Retention knobs are installed by tooling technicians or CNC setup personnel. Always ensure the spindle and drawbar are fully de-energized and the machine is in a safe, locked-out state before removing or installing a retention knob. Use the correct torque wrench and retention knob installation tool to avoid damaging the thread or toolholder taper - do not over-tighten by hand. Inspect the toolholder taper and spindle bore for wear or contamination before installation.