Chicago-latrobe 53155 Taper Shank Drill Bit 55/64 in 3MT Hss

Product Description

The CHICAGO-LATROBE 53155 is a taper shank drill bit designed for heavy-duty drilling in metal, cast iron, and similar materials. It carries a 55/64-inch (0.8594 inches decimal) cutting diameter and mounts via a No. 3 Morse Taper (3MT) shank, making it compatible with drill presses, lathes, and machining centers equipped with a matching taper socket. The bit is manufactured from high speed steel (HSS) with an oxide finish that provides moderate lubricity and corrosion resistance during cutting operations. Overall length is 10.75 inches, and the 118-degree standard point geometry suits general-purpose hole-making across a wide range of workpiece materials.

This bit fits production and maintenance machining environments where a Morse taper interface is standard — typically manual drill presses and turret lathes in job shops, manufacturing facilities, and industrial maintenance settings. The regular spiral flute and right-hand cutting direction are suited for conventional feed drilling. Web thinning at the point reduces thrust requirements and improves chip clearance when starting holes in harder stock. Licensed machinists, tool-and-die makers, and millwrights are the primary users of this bit size and shank style.

Key Features

• 55/64-inch (0.8594 inches) cutting diameter with a diameter tolerance of +0.0000 to -0.0012 inches
• No. 3 Morse Taper (3MT) shank for secure, self-holding fit in compatible spindles
• High speed steel construction for general-purpose metal drilling
• Oxide finish for added surface lubricity and light corrosion resistance
• 118-degree standard point angle with web thinning to reduce entry thrust
• Regular spiral flute, 6.125 inches flute length, right-hand cutting direction

Compatibility

Designed as an OEM-style replacement or direct-use taper shank drill bit for drill presses, lathes, and machining centers equipped with a No. 3 Morse Taper spindle socket.

Installation Notes

Installation is performed by machinists or maintenance technicians using a drill press or lathe with a No. 3 Morse Taper spindle. Ensure the taper socket and shank are clean and free of chips or oil before seating the bit — contamination prevents proper self-holding engagement. Use a proper drift and drift slot to safely remove the bit from the spindle; never strike the bit directly. Secure the workpiece firmly before drilling to prevent rotation or movement under load.