Hertel 89324370 Taper Shank Drill Bit 1-17/64 in 4MT Hss

Product Description

The HERTEL 89324370 is a taper shank drill bit designed for drilling large-diameter holes in metal, steel, and similar materials in heavy-duty machining applications. Built from high-speed steel with an oxide finish, it measures 1-17/64 inches (1.2656 inches decimal) in diameter and delivers a standard 118-degree point angle suited for general-purpose drilling. The 4MT (Morse Taper 4) shank seats directly into compatible taper-socket spindles on drill presses, lathes, and milling machines, eliminating the need for a separate chuck. With an 8.5-inch flute length and a 14.125-inch overall length, this bit handles deep-hole work where shorter tooling falls short.

This drill bit is intended for machine shop, manufacturing, and industrial maintenance environments where large through-holes or stepped bores are required in ferrous and non-ferrous metals. It is a general-purpose cutting tool installed by machinists and tool-and-die professionals on drill presses, radial arm drills, and lathes equipped with a No. 4 Morse Taper spindle socket. The oxide finish provides light surface protection and reduces friction during cutting operations.

Key Features

• 1-17/64 inch (1.2656 inch) diameter for large-bore drilling applications
• No. 4 Morse Taper (4MT) shank seats directly in compatible spindle sockets without a separate chuck
• 118-degree split-point angle provides aggressive, general-purpose cutting geometry
• High-speed steel construction withstands the heat generated during high-feed metal drilling
• Oxide finish reduces surface friction and provides light corrosion resistance
• 8.5-inch flute length and 14.125-inch overall length accommodate deep-hole work

Compatibility

Designed for use in drill presses, lathes, radial arm drills, and milling machines equipped with a No. 4 Morse Taper (4MT) spindle socket or taper sleeve adapter.

Installation Notes

Installation is performed by machinists or qualified maintenance technicians. Before mounting or removing the bit, power down the machine and bring the spindle to a complete stop. Seat the 4MT shank fully into the spindle socket by hand, then use a draw bar or drift key as appropriate for the machine design to secure the taper. Inspect the taper shank and socket for chips or burrs before seating, as debris will cause runout and accelerate wear.