Hertel 89323091 Taper Shank Drill Bit 7/8 in 3MT Hss

Product Description

The HERTEL 89323091 is a taper shank drill bit designed for drilling precise, full-diameter holes in metal, wood, and general-purpose materials. Built from high-speed steel with an oxide finish, it delivers reliable cutting performance in production and maintenance machining environments. The bit measures 7/8 inch in diameter with a 10.75-inch overall length and a 6.125-inch flute length. The 3MT (Morse Taper 3) shank seats directly into compatible taper-socket spindles on drill presses, lathes, and milling machines, eliminating the need for a separate chuck in most setups. Machinists, toolroom technicians, and maintenance mechanics are the primary users.

This bit is suited for general-purpose drilling operations in job shops, manufacturing facilities, and maintenance departments. The 118-degree point angle is the standard geometry for drilling mild steel, cast iron, aluminum, and similar materials. The oxide finish provides moderate lubricity and corrosion resistance during cutting. It is sold individually and is appropriate wherever a 7/8-inch taper shank drill is required in manual or CNC machine tool setups that accept a No. 3 Morse Taper socket.

Key Features

• 7/8 inch (0.8750 inch) drill diameter for accurate hole sizing
• No. 3 Morse Taper (3MT) shank for direct spindle mounting without a chuck
• 118-degree drill point angle suitable for general-purpose materials
• High-speed steel construction for durability across a range of workpiece materials
• Oxide finish for moderate lubricity and surface protection
• 6.125-inch flute length supports deeper hole applications

Compatibility

Designed for use in drill presses, lathes, and milling machines equipped with a No. 3 Morse Taper (3MT) spindle or sleeve socket. A reducing or extending sleeve may be required if the machine spindle taper differs from 3MT.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. 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 runout. Use a drift key and the designated drift slot to remove the bit — never strike the bit directly to dislodge it.