Cleveland C12279 Taper Shank Drill Bit 1-1/4 in 4MT Hss

Product Description

The CLEVELAND C12279 is a taper shank drill bit engineered for heavy-duty drilling in metal, cast iron, and similar materials. Built from high-speed steel with an oxide finish, it carries a 1.25 inch diameter and a 118-degree standard point angle with web thinning for reduced thrust at entry. The 4MT (Morse Taper 4) shank seats directly into compatible taper-socket spindles on drill presses, lathes, and radial arm machines, eliminating the need for a chuck. This bit is a general-purpose tool sized for production and maintenance machinists who drill large-diameter holes in ferrous and non-ferrous workpieces.

The C12279 is suited for stationary machine tool applications in industrial, manufacturing, and maintenance settings. Its 7.875 inch flute length provides adequate chip clearance during deep-hole passes, and the 13.5 inch overall length accommodates standard 4MT spindle setups. Right-hand spiral flutes eject chips efficiently in standard forward-rotation drilling operations. This bit is typically used in job shops, fabrication facilities, and plant maintenance operations where large-diameter through-holes and blind holes are required in structural or plate stock.

Key Features

• 1.25 inch diameter with a diameter tolerance of +0.0000 to -0.0015 inches for consistent hole sizing
• 4MT (Morse Taper 4) shank for direct mounting in taper-socket spindles without a chuck
• 118-degree standard point angle with web thinning to reduce entry thrust
• High-speed steel construction with oxide finish for corrosion resistance and reduced friction
• Regular right-hand spiral flutes for efficient chip evacuation in forward-rotation drilling
• Meets ASME B94.11M standards for drill bit geometry and dimensional accuracy

Compatibility

Designed for use in drill presses, lathes, and other stationary machine tools equipped with a Morse Taper 4 spindle socket. Suitable for general-purpose drilling in ferrous and non-ferrous materials.

Installation Notes

Installation should be performed by a qualified machinist. 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. Do not use a standard drill chuck to hold a taper shank bit.