Seco 03119964 Retention Knob CAT40 5/8-11 Thread

Product Description

The SECO 03119964 is a CAT40 retention knob designed to secure tool holders in CNC machining center spindles that use the CAT40 taper standard. It threads into the drawbar mechanism at 5/8-11 UNC thread and pulls the tool holder firmly into the spindle taper during operation. This knob features a 15-degree angle radius at the drive notch, a knob diameter of 0.744 inches, and an overall length of 2.063 inches. Through-coolant capability is supported, making it compatible with coolant-through spindle and tooling setups. Machinists and CNC maintenance technicians install this part when replacing worn or damaged retention knobs on CAT40 tooling systems.

This retention knob is suited for CNC vertical and horizontal machining centers running CAT40 toolholders. It is a direct-fit replacement for worn retention hardware in production and job-shop environments. The 0.547-inch neck diameter and 1.024-inch knob-to-flange length are dimensioned to standard CAT40 drawbar engagement specs. Through-coolant support makes it appropriate for high-speed finishing and drilling operations where coolant delivery through the spindle centerline is required.

Key Features

• CAT40 taper size for use with standard CAT40 tool holders
• 5/8-11 UNC thread engages standard CAT40 drawbar mechanisms
• 15-degree angle radius at drive notch for positive drawbar engagement
• Through-coolant capable for coolant-through spindle applications
• 0.744-inch knob diameter and 2.063-inch overall length to CAT40 dimensional standards
• 0.547-inch neck diameter and 1.024-inch knob-to-flange length for proper seating

Compatibility

Designed as a standard replacement retention knob for CNC machining center spindles and tool holders conforming to the CAT40 taper specification with a 5/8-11 drawbar thread.

Installation Notes

Installation is performed by qualified CNC machinists or toolroom technicians. Always power down and lock out the machining center spindle before removing or installing retention knobs. Use the correct retention knob wrench for the CAT40 drive notch geometry and torque to the machine tool builder specification found in the spindle or drawbar service documentation. Inspect the drawbar thread and tool holder pull stud bore for wear or damage before installing the new knob.