Hertel 89324172 Taper Shank Drill Bit 1-5/64 in 4MT Hss

Product Description

The HERTEL 89324172 is a taper shank drill bit engineered for heavy-duty drilling applications requiring a large-diameter, rigidly supported cutting tool. It features a 1-5/64 inch (1.0781 inch decimal) diameter and mounts via a 4MT (Morse Taper 4) shank, which seats directly into compatible drill press spindles, lathes, or milling machine quills without a separate chuck. The drill point is ground to a 118-degree angle, the standard geometry for general-purpose work in steel, cast iron, aluminum, and similar materials. The body is manufactured from high-speed steel with an oxide finish that provides a base level of lubricity and corrosion resistance during storage and use.

This bit is suited for metal fabrication shops, machine shops, and industrial maintenance operations where large-diameter through-holes or stepped bores are required. The 4MT shank makes it a practical choice for floor-standing drill presses and engine lathes commonly found in production and job-shop environments. Its general-purpose classification means it performs reliably across a range of workpiece materials without requiring specialized cutting fluids or exotic setups, though using cutting fluid is recommended when drilling ferrous metals at this diameter.

Key Features

• 1-5/64 inch (1.0781 inch) cutting diameter for large-bore applications
• 4MT Morse Taper shank for direct spindle mounting without a chuck
• 118-degree drill point angle — standard geometry for general-purpose metal drilling
• High-speed steel construction provides toughness and heat resistance at moderate cutting speeds
• Oxide finish reduces friction and offers basic corrosion protection
• 6-7/8 inch flute length accommodates significant depth of cut

Compatibility

Designed for use in machine spindles, drill presses, lathes, and milling machines equipped with a 4MT (Morse Taper 4) socket.

Installation Notes

Installation is performed by machinists or qualified toolroom personnel. Power down and lock out the machine before seating or removing the taper shank. Clean both the taper shank and the spindle socket thoroughly before insertion to ensure full contact and prevent fretting. Use a drift and knockout slot to remove the bit from the spindle — do not strike the bit body directly.