Parlec 5001TRK Retention Knob CAT50 1-8 Thread

Product Description

The PARLEC 5001TRK is a Style B retention knob designed for CAT50 toolholders used in CNC machining centers. It features a 1-8 inch thread and a 90-degree angle radius, providing secure tool clamping at the spindle interface. With a knob diameter of 0.904 inches, a pilot diameter of 1.026 inches, and an overall length of 3.31 inches, this retention knob is built to maintain precise axial positioning during high-speed milling, boring, and drilling operations. Machinists and toolroom technicians install these components when setting up or replacing worn drawbar hardware on CAT50 spindle systems.

This retention knob is intended for use in CAT50 spindle toolholder assemblies on vertical and horizontal CNC machining centers. The 1-8 thread size mates directly with the drawbar mechanism inside the spindle. The knob does not include through-coolant capability, making it suited for dry or flood-coolant setups where internal coolant delivery through the retention knob is not required. It is a direct-fit replacement or new-build component for shops running CAT50 tooling systems.

Key Features

• CAT50 taper size for compatibility with standard CAT50 spindle drawbar systems
• 1-8 inch thread size for direct drawbar engagement
• 90-degree angle radius for proper seating geometry
• Style B design with 0.904-inch knob diameter and 1.026-inch pilot diameter
• Knob-to-flange length of 1.77 inches and flange thickness of 0.39 inches for precise axial positioning
• No through-coolant passage, suitable for standard flood or dry machining environments

Compatibility

Designed as a direct-fit retention knob for CAT50 toolholder assemblies used in CNC machining center spindles requiring a 1-8 thread drawbar connection.

Installation Notes

Retention knobs are installed by qualified machinists or toolroom technicians. Always power down the machine and confirm the spindle is fully stopped before removing or installing a retention knob. Use the appropriate spanner or retention knob wrench to achieve proper torque without over-tightening the thread. Inspect the drawbar thread condition before installation to ensure a clean, undamaged mating interface.