Hertel 89324073 Taper Shank Drill Bit 1-9/64 in 4MT Hss

Product Description

The HERTEL 89324073 is a taper shank drill bit designed for drilling large-diameter holes in metal, cast iron, and general-purpose industrial materials. It carries a 4 Morse Taper (4MT) shank that seats directly into compatible taper-socket spindles on drill presses, lathes, and milling machines, eliminating the need for a separate chuck. The cutting diameter is 1-9/64 inches (1.1406 inches decimal), with a 118-degree split or conventional point geometry suited for general-purpose work. The bit is manufactured from high-speed steel (HSS) with an oxide finish that provides a basic level of corrosion resistance and reduces galling during drilling. Machinists, tool-and-die technicians, and maintenance mechanics are the primary users.

This bit is appropriate for production and maintenance drilling operations where a large-diameter hole must be bored in a single pass or as a finishing step after a pilot hole. Typical applications include drilling clearance holes, stepped bores, and through-holes in structural steel, plate stock, and similar ferrous materials. The 4MT taper shank makes it compatible with mid-to-large capacity machine tools commonly found in job shops, fabrication facilities, and maintenance departments. The oxide finish suits standard cutting-fluid-assisted operations.

Key Features

• 1-9/64 inch (1.1406 inch) cutting diameter for large-bore applications
• 4 Morse Taper shank seats directly into 4MT spindle sockets without a separate chuck
• 118-degree drill point angle for general-purpose drilling in ferrous and non-ferrous materials
• High-speed steel construction provides good heat resistance at conventional cutting speeds
• Oxide finish reduces surface friction and offers basic corrosion protection
• 7-1/4 inch flute length and 12-7/8 inch overall length accommodate deep-hole drilling setups

Compatibility

Designed for use in machine tool spindles, drill presses, and lathes equipped with a 4 Morse Taper (4MT) socket. No specific model compatibility data was provided by the manufacturer for this part number.

Installation Notes

Installation requires a clean, undamaged 4MT taper socket; remove any chips, oil residue, or burrs from both the shank and the socket before seating to ensure full contact and prevent slippage under load. Always power down and lock out the machine spindle before inserting or removing a taper shank tool. Use an appropriate drift and drift slot to eject the bit — never strike the bit body directly. Apply cutting fluid appropriate for the workpiece material to extend tool life and maintain dimensional accuracy.