Techniks 21005-60 CAT50 Retention Knob 1-8 Thread

Product Description

The TECHNIKS 21005-60 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 60-degree angle radius, and a knob diameter of 0.906 inches with an overall length of 3.346 inches. This component transmits the drawbar clamping force that locks a toolholder firmly in the spindle, maintaining accurate tool positioning during cutting operations. It is a standard consumable item replaced by machinists and toolroom technicians during routine toolholder maintenance or when thread wear is detected.

The 21005-60 is suited for use in horizontal and vertical machining centers equipped with CAT50 spindles. CAT50 tooling is common in heavy-duty production environments where large-diameter tools, deep cuts, and high torque loads are the norm. This retention knob threads directly into the pull stud port of a compatible CAT50 toolholder and interfaces with the machine spindle drawbar system. It is appropriate for shops running high-volume metal removal on steel, cast iron, and similar materials where spindle retention integrity is critical.

Key Features

• CAT50 taper specification for compatibility with standard CAT50 spindle systems
• 1-8 inch thread size for direct installation into CAT50 toolholder pull stud ports
• 60-degree angle radius geometry matches standard drawbar engagement profiles
• 0.906 inch knob diameter sized for proper drawbar finger engagement
• 3.346 inch overall length provides correct protrusion and seating depth
• Lightweight at 0.6 pounds, minimizing added mass on the toolholder assembly

Compatibility

Designed as a replacement retention knob for CAT50 toolholders using a 1-8 inch thread and a 60-degree angle radius pull stud interface.

Installation Notes

Retention knobs are installed and serviced by machinists or toolroom technicians. Before replacing a retention knob, confirm the machine spindle drawbar is fully released and the toolholder is removed from the spindle. Thread the knob into the toolholder by hand first to confirm thread engagement before applying a torque wrench. Follow the toolholder manufacturer torque specifications and the machining center builder guidelines for pull stud installation.