Techniks 21006-15C Retention Knob CAT40 5/8-11

Product Description

The TECHNIKS 21006-15C is a CAT40 retention knob designed for securing tool holders in CAT40 spindle tapers on CNC machining centers. It threads into the tool holder drawbar at 5/8-11 and features a 15-degree angle radius on the knob head, which supports consistent pull-stud seating and repeatable clamping force. The knob diameter measures 0.75 inches with an overall length of 1.88 inches. Through-coolant capability is built in, making this knob compatible with machines that deliver coolant through the spindle. Machinists and toolroom technicians install this component as a standard service item during tool holder maintenance or initial setup.

This retention knob is suited for use in vertical and horizontal CNC machining centers equipped with CAT40 spindle interfaces. It is a direct-fit component for CAT40 tool holders requiring a 5/8-11 pull stud thread. The through-coolant design supports high-pressure coolant delivery applications where coolant is routed through the spindle and tool holder assembly. Typical installations are found in production machining environments, job shops, and maintenance tool cribs where CAT40 tooling is the standard.

Key Features

• CAT40 taper size for standard CNC machining center spindles
• 5/8-11 thread size for secure drawbar engagement
• 15-degree angle radius for consistent pull-stud seating
• 0.75 inch knob diameter with 1.88 inch overall length
• Through-coolant design supports spindle coolant delivery systems

Compatibility

Designed as a direct replacement retention knob for CAT40 tool holders requiring a 5/8-11 thread pull stud.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Power down and de-energize the machining center and relieve any drawbar clamping pressure before removing or installing retention knobs. Use the appropriate torque wrench and thread the knob to the tool holder manufacturer's specified engagement depth. Inspect threads on both the knob and tool holder for wear or damage before reinstalling.