Seco 03119965 CAT40 Retention Knob 45 Degree M16x2 Through Coolant

Product Description

The SECO 03119965 is a CAT40 retention knob designed to secure toolholders in CAT40 spindle taper machines during milling and machining operations. It features a 45-degree angle radius and an M16x2 thread for positive engagement with the drawbar. The knob diameter measures 0.74 inches, with a neck diameter of 0.492 inches and a knob-to-flange length of 0.642 inches. Overall length is 1.65 inches. Through-coolant capability is built in, allowing coolant delivery directly through the toolholder assembly. Installation and removal is handled by machinists or toolroom technicians during toolholder changes or spindle service.

This retention knob is suited for CNC machining centers and vertical or horizontal mills equipped with CAT40 spindle interfaces. It is a standard component used in production and job-shop environments where CAT40 toolholders are the shop standard. The through-coolant feature makes it appropriate for applications where internal coolant delivery to the cutting tool is required, such as deep-hole drilling or high-speed finishing operations.

Key Features

• CAT40 taper size for direct compatibility with CAT40 spindle toolholders
• M16x2 thread engages standard CAT40 drawbar systems
• 45-degree angle radius for reliable seating and pullout resistance
• Through-coolant design supports internal coolant delivery
• Knob diameter of 0.74 inches with 0.492-inch neck diameter
• Compact 1.65-inch overall length fits standard toolholder retention geometry

Compatibility

Designed as a direct-fit retention knob for CAT40 toolholders with M16x2 drawbar thread. Consult toolholder manufacturer documentation to confirm thread engagement and seating requirements before installation.

Installation Notes

Retention knobs are installed and removed by machinists or toolroom personnel using a retention knob wrench sized for the knob diameter. The spindle must be powered down and the machine placed in an e-stop or lockout-tagout state before servicing toolholders. Apply thread locking compound or torque to the toolholder manufacturer's specification — do not over-torque, as this can distort the toolholder taper. Inspect threads on both the knob and the toolholder bore for wear or damage before installation.