Cleveland C12243 Taper Shank Drill Bit 15/16 in 3MT Hss

Product Description

The CLEVELAND C12243 is a taper shank drill bit engineered for general-purpose drilling in metal, steel, and similar materials. Built from high-speed steel with an oxide finish, it accepts a 3MT (Morse taper) shank for secure seating in compatible drill presses, lathes, and machining centers. The bit measures 15/16 inch (0.9375 inch) in diameter with a 118-degree standard point angle and web-thinned geometry that reduces thrust and improves chip clearance at entry. With a flute length of 6.125 inches and an overall length of 10.75 inches, it handles moderate-depth through-hole and blind-hole applications. Cutting direction is right-hand with a regular spiral flute pattern. This bit is intended for installation and use by machinists and tool-and-die professionals.

The C12243 is suited for general-purpose production drilling where a Morse taper interface is required. Typical applications include drilling on floor-standing drill presses, manual lathes with tailstock chucks, and milling machines fitted with a 3MT adapter. It performs well in ferrous metals, aluminum, and plastics at moderate speeds and feeds. The oxide finish provides a baseline level of lubricity and corrosion resistance for shop environments. This bit conforms to ASME B94.11M standards, making it appropriate for toolrooms, maintenance shops, and production floor use.

Key Features

• 15/16 inch diameter (0.9375 inch decimal) with a diameter tolerance of +0.0000 to -0.0012 inches
• 3MT Morse taper shank for direct mounting in compatible drill presses, lathes, and machining centers
• 118-degree standard point angle with web-thinned geometry for reduced entry thrust
• High-speed steel construction with oxide finish for general-purpose durability
• Regular right-hand spiral flute, 6.125 inches long, for efficient chip evacuation
• Conforms to ASME B94.11M dimensional standards

Compatibility

Designed as an OEM-style general-purpose taper shank drill bit compatible with any machine spindle or tailstock chuck accepting a 3MT (No. 3 Morse Taper) interface.

Installation Notes

Installation is performed by machinists or qualified tool operators. Before mounting, ensure the machine spindle is fully stopped and de-energized. Clean both the shank taper and the spindle socket to remove chips and oil before seating to ensure proper taper contact. Use a drift and mallet against the drift slot to remove the bit; never use impact force against the cutting end or flutes.