Techniks 21005-45C Retention Knob CAT50 1-8 Thread

Product Description

The TECHNIKS 21005-45C 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 knob diameter of 0.906 inches with an overall length of 3.346 inches. Through-coolant capability allows coolant to pass directly through the knob for applications requiring internal coolant delivery. This component is installed by CNC machinists and toolroom technicians as part of routine toolholder assembly and spindle maintenance.

The 21005-45C suits CAT50 toolholder assemblies used in heavy-duty vertical and horizontal machining centers. It is appropriate for production shops, job shops, and toolroom environments where CAT50 spindle tooling is standard. The through-coolant feature makes it well suited for high-speed machining operations where directed coolant flow to the cutting zone is required. Weighing 0.7 pounds, the knob is a direct-fit replacement for worn or damaged CAT50 retention knobs requiring a 1-8 thread interface.

Key Features

• CAT50 taper size for compatibility with CAT50 spindle toolholders
• 1-8 inch thread size for secure engagement with the drawbar
• 45-degree angle radius for proper seating and clamping geometry
• Through-coolant design supports internal coolant delivery to the cutting tool
• 0.906 inch knob diameter and 3.346 inch overall length for standard fitment

Compatibility

Designed as an OEM-style replacement retention knob for CAT50 toolholders requiring a 1-8 inch thread and 45-degree angle radius.

Installation Notes

Installation should be performed by a qualified CNC machinist or toolroom technician. Power down and lock out the machining center spindle before removing or installing retention knobs. Use the appropriate spanner or retention knob wrench to achieve proper torque without damaging the knob or toolholder threads. Inspect the drawbar and toolholder threads for wear or contamination before installing a replacement knob.