Haimer 88.604.30 Retention Knob BT30 M12x1.75

Product Description

The HAIMER 88.604.30 is a BT30 retention knob designed to secure tool holders in BT30 spindle tapers on CNC machining centers and milling machines. The knob threads into the drawbar mechanism at M12 x 1.75 and pulls the tool holder firmly into the spindle bore during operation. It features a 30-degree angle radius at the engagement surface, a knob diameter of 0.4331 inches, and a flange thickness of 0.7087 inches. Machinists and toolroom technicians install this component when replacing worn or damaged pull studs to restore proper clamping force and tool holder retention in the spindle.

This retention knob is suited for BT30 tooling systems used in vertical and horizontal machining centers found in production shops, job shops, and toolrooms. The BT30 taper is common in lighter-duty CNC milling applications where compact spindle sizes are used. The knob is installed into any BT30 tool holder that accepts an M12 x 1.75 pull stud thread, making it a direct-fit replacement in standard BT30 tooling assemblies.

Key Features

• BT30 taper fitment for standard BT30 tool holders
• M12 x 1.75 thread size for compatibility with BT30 drawbar systems
• 30-degree angle radius at the engagement surface for proper drawbar contact
• Knob diameter of 0.4331 inches for correct spindle clearance
• Flange thickness of 0.7087 inches for positive seating against the tool holder
• Lightweight at 0.05 pounds, minimizing added mass in the spindle

Compatibility

Designed as a direct-fit replacement pull stud for BT30 tool holders with an M12 x 1.75 internal thread and a 30-degree angle radius drawbar engagement.

Installation Notes

Retention knobs are installed and removed by qualified machinists or toolroom technicians. The spindle must be powered down and the machine placed in a safe, locked-out state before servicing any tooling components. Use the correct pull stud wrench or spanner to torque the knob into the tool holder - do not use substitutes that may damage the thread or flange. Verify that the installed knob is fully seated and that the flange contacts the tool holder face squarely before returning the assembly to service.