Techniks 21005-45 Retention Knob CAT50 1-8 Thread

Product Description

The TECHNIKS 21005-45 is a retention knob designed to secure CAT50 toolholders in CNC machining center spindles. It threads into the drawbar mechanism, holding the toolholder firmly during high-speed cutting operations. The knob features a 1-8 thread size, a 45-degree angle radius, and a knob diameter of 0.906 inches with an overall length of 3.346 inches. Machinists and CNC service technicians install this component as part of routine toolholder maintenance or when replacing worn retention hardware.

This retention knob is suited for use in CAT50 spindle applications common in heavy-duty vertical and horizontal machining centers. It is a standard replacement component used in production shops, tool cribs, and machine maintenance programs. The 45-degree angle radius seats correctly against the drawbar, ensuring consistent clamping force and reliable tool engagement during operation.

Key Features

• CAT50 taper size for compatibility with CAT50 toolholder shanks
• 1-8 thread size for direct engagement with standard CAT50 drawbar mechanisms
• 45-degree angle radius for proper seating and consistent clamping force
• 0.906 inch knob diameter for standard retention knob tooling
• 3.346 inch overall length meeting CAT50 dimensional standards
• Lightweight at 0.15 pounds for easy handling during toolholder changes

Compatibility

Designed as an OEM-style replacement retention knob for CAT50 toolholders used in compatible CNC machining center spindles with 1-8 drawbar threads.

Installation Notes

Installation should be performed by a qualified machinist or CNC maintenance technician. Always power down and lock out the machine before servicing the spindle or replacing retention knobs. Torque the retention knob according to the machine tool manufacturer specifications for the drawbar assembly. Inspect the drawbar and spindle bore for wear or damage before installing a new retention knob.