Hertel 89323869 Taper Shank Drill Bit 1-3/8 in 4MT Hss

Product Description

The HERTEL 89323869 is a taper shank drill bit designed for drilling large-diameter holes in metal, cast iron, and similar materials on drill presses and lathes equipped with a Morse taper spindle. Built from high-speed steel with an oxide finish, this bit measures 1.375 inches in diameter with an overall length of 14.5 inches and a flute length of 8.875 inches. The 118-degree split-free point geometry suits general-purpose drilling applications where consistent hole geometry and reliable chip evacuation are required. It is installed by machinists, tool-and-die workers, and industrial maintenance technicians.

This drill bit is suited for production and maintenance drilling operations in metalworking environments. The 4MT taper shank seats directly into a matching No. 4 Morse taper socket on a drill press, lathe tailstock, or milling machine spindle, eliminating the need for a separate chuck. General-purpose tool performance makes it appropriate for carbon steel, alloy steel, cast iron, and softer non-ferrous stock. Typical applications include through-hole drilling, step drilling, and enlarging existing holes in structural or fabricated components.

Key Features

• 1.375-inch (1-3/8 inch) drill diameter for large-bore applications
• No. 4 Morse taper (4MT) shank for direct spindle mount without a chuck
• 118-degree drill point angle for general-purpose metal drilling
• High-speed steel construction provides heat and wear resistance at standard cutting speeds
• Oxide finish helps reduce friction and provides light corrosion resistance
• 8.875-inch flute length supports deep-hole chip clearance

Compatibility

Designed for use in drill presses, lathe tailstocks, and milling machines fitted with a No. 4 Morse taper (4MT) spindle socket.

Installation Notes

Installation is performed by qualified machinists or maintenance technicians. Power down and lock out the machine before seating or removing the taper shank. Clean both the shank and the spindle socket thoroughly before insertion to ensure full taper contact and prevent slippage under load. Use a drift key and drift slot to remove the bit safely; never strike the spindle directly.