Techniks 21003-60 CAT40 Retention Knob 5/8-11 Thread

Product Description

The TECHNIKS 21003-60 is a CAT40 retention knob designed to secure toolholders in CNC machining center spindles that use the CAT40 taper standard. It threads into the drawbar at 5/8-11 thread and pulls the toolholder firmly into the spindle taper, maintaining rigidity and concentricity during cutting operations. The knob features a 60-degree angle radius, a knob diameter of 0.59 inches, and an overall length of 2.25 inches. Installation and replacement are handled by machinists and CNC maintenance technicians as part of routine toolholder maintenance or spindle service.

This retention knob is suited for CAT40 toolholders used in vertical and horizontal machining centers operating on the CAT40 spindle interface. It is a direct-fit component for drawbar-actuated automatic toolchanger systems and is appropriate for production shops, job shops, and maintenance departments that service or rebuild CAT40 toolholder assemblies. The 5/8-11 thread is the standard thread specification for this taper size.

Key Features

• CAT40 taper size for compatibility with the CAT40 spindle standard
• 5/8-11 threaded shank for engagement with the machine drawbar
• 60-degree angle radius for proper drawbar pull engagement geometry
• 0.59-inch knob diameter for use with CAT40 toolholder retention groove
• 2.25-inch overall length
• Lightweight at 0.15 pounds for minimal impact on toolholder balance

Compatibility

Designed as an OEM-style replacement retention knob for CAT40 toolholders used in drawbar-actuated CNC machining center spindles requiring a 5/8-11 threaded retention knob.

Installation Notes

Retention knobs should be installed and torqued by a qualified machinist or CNC maintenance technician. Power down and lock out the machining center before servicing any toolholder or spindle component. Use the appropriate retention knob wrench and toolholder fixture to prevent damage to the taper or knob during installation. Inspect threads on both the knob and toolholder for wear or damage before reinstalling.