Hertel 89323026 Taper Shank Drill Bit 1-7/32 in 4MT Hss

Product Description

The HERTEL 89323026 is a taper shank drill bit designed for drilling large-diameter holes in metal, cast iron, and similar materials. It accepts a 4 Morse Taper (4MT) shank, making it compatible with heavy-duty drill presses and milling machines equipped with the corresponding taper socket. The cutting end features a 118-degree point angle, a general-purpose geometry suited for a broad range of ferrous and non-ferrous materials. Manufactured from high-speed steel with an oxide finish, this bit delivers reliable wear resistance under standard cutting conditions. The overall length of 13.125 inches and a flute length of 7.5 inches support deep-hole drilling applications where reach is a primary requirement.

This drill bit is intended for shop and industrial use where a 4MT spindle taper is present. Typical installations include drill press operations, horizontal boring setups, and manual or CNC milling machines with taper adapters. The 1.2188-inch (1-7/32 inch) cutting diameter makes it a practical choice for bolt-hole enlargement, bearing seat preparation, and similar precision boring tasks performed by machinists and tool-and-die professionals in job shop or production environments.

Key Features

• 1-7/32 inch (1.2188 inch decimal) cutting diameter for large-bore drilling applications
• 4 Morse Taper (4MT) shank seats securely in compatible drill press and milling machine spindles
• 118-degree point angle provides a general-purpose cutting geometry for ferrous and non-ferrous materials
• High-speed steel construction offers toughness and heat resistance during sustained cutting operations
• Oxide finish reduces friction at the cutting surface and provides light corrosion resistance during storage
• 7.5-inch flute length and 13.125-inch overall length support deep-hole drilling requirements

Compatibility

Designed for use in drill press spindles, milling machine quills, and boring setups that accept a Number 4 Morse Taper (4MT) shank. Verify the spindle taper designation of the host machine before installation.

Installation Notes

Installation and removal of taper shank drill bits should be performed by a qualified machinist. Power down and lock out the machine before inserting or removing the bit from the spindle taper. Clean both the shank taper and the spindle socket thoroughly before seating to ensure proper contact and prevent chatter or runout. Use the appropriate drift key in the spindle drift slot to safely eject the bit — never strike the bit directly or use an undersized drift.