Techniks 21005-60C Retention Knob CAT50 1-8 Thread

Product Description

The TECHNIKS 21005-60C is a CAT50 retention knob designed to secure toolholders in CAT50 spindle tapers on CNC machining centers. It features a 1-8 inch thread and a 60-degree angle radius that ensures consistent draw-bar engagement and reliable clamping force during high-speed machining operations. The knob diameter is 0.906 inches with an overall length of 3.346 inches. Through-coolant capability allows cutting fluid to pass directly through the knob, supporting applications that require internal coolant delivery to the tool. This component is installed by CNC machinists and toolroom technicians as part of standard toolholder assembly.

The 21005-60C is suited for use in CNC vertical and horizontal machining centers equipped with CAT50 spindles. It is a standard component in toolholder assemblies where a draw-bar must engage and retain the toolholder under high spindle loads and rapid tool-change cycles. The through-coolant design makes it appropriate for applications involving high-pressure coolant delivery systems where uninterrupted coolant flow to the cutting zone is required.

Key Features

• CAT50 taper size for direct fitment in CAT50 spindle applications
• 1-8 inch thread size for standard draw-bar engagement
• 60-degree angle radius for consistent clamping geometry
• Through-coolant compatible to support internal coolant delivery
• 0.906 inch knob diameter with 3.346 inch overall length

Compatibility

Designed as an OEM-style replacement retention knob for CNC machining centers with CAT50 spindle tapers and 1-8 draw-bar thread specifications.

Installation Notes

Retention knobs are installed by CNC machinists or toolroom technicians. Always power down and lock out the machine spindle before installing or removing retention knobs. Use the appropriate spanner or retention knob installation tool to achieve proper seating - do not impact-drive the knob directly into the toolholder. Follow the machine tool manufacturer's torque specifications and verify toolholder runout after assembly.