Hertel 89324057 Taper Shank Drill Bit 1-11/64 in 4MT Hss

Product Description

The HERTEL 89324057 is a taper shank drill bit designed for heavy-duty drilling operations in metal, cast iron, and similar industrial materials. Built from high-speed steel with an oxide finish, it measures 1-11/64 inches (1.1719 inches decimal) in diameter and runs 13 inches overall length. The 4MT taper shank seats directly into compatible machine spindles, providing rigid, centered engagement suited for large-diameter boring on drill presses, lathes, and boring mills. The 118-degree split-point geometry initiates cuts without excessive feed pressure and resists walking on flat stock. This bit is a standard production tool for machinists and tool-room technicians.

This taper shank drill bit is intended for industrial and production machining environments where large-diameter holes are drilled through ferrous and non-ferrous metals. The 4MT taper shank makes it a direct fit for machine spindles and tailstocks that accept Morse Taper No. 4 tooling. Typical applications include drilling through-holes and clearance holes in structural steel, machine frames, fixtures, and heavy plate. It is suited for use on floor-standing drill presses, engine lathes, and radial arm drills equipped with a 4MT socket.

Key Features

• 1-11/64 inch (1.1719 inch) diameter for large-bore production drilling
• 4MT taper shank for direct spindle or tailstock mounting without a chuck
• 118-degree drill point angle for general-purpose metal drilling
• High-speed steel construction maintains hardness under elevated cutting temperatures
• Oxide finish provides mild lubricity and corrosion resistance during storage and use
• 13-inch overall length accommodates deep-hole and extended-reach drilling setups

Compatibility

Designed for use in machine spindles and lathe tailstocks that accept Morse Taper No. 4 tooling. Consult your machine documentation to confirm the taper designation of the spindle before installation.

Installation Notes

Installation and removal of taper shank tooling should be performed by a qualified machinist. Power down and lock out the machine before seating or drifting the shank. Clean both the taper shank and spindle socket thoroughly before insertion to ensure full contact and prevent fretting. Use a proper drift and soft mallet to eject the shank — do not strike the cutting flutes or the body of the bit.