Cleveland C14261 Cobalt Screw Machine Drill Bit No. 21

Product Description

The CLEVELAND C14261 is a screw machine length drill bit designed for high-production drilling in tough materials. Built from M42 cobalt high-speed steel, it delivers heat and wear resistance needed when cutting alloy steels, stainless, and aluminum at elevated speeds. The 135-degree split point reduces thrust and self-centers without a center punch. At 2.125 inches overall length, the stubby screw machine profile minimizes deflection and increases rigidity compared to jobber-length bits. A parabolic flute geometry promotes efficient chip evacuation. This bit is a standard choice for machine shops, maintenance technicians, and production drilling applications.

The C14261 is suited for CNC drilling centers, drill presses, and screw machines where a short, rigid bit is required. It carries a No. 21 wire gauge designation, corresponding to 0.1590 inches in diameter. Primary workpiece materials include alloy steel and aluminum. The straight cylindrical shank fits standard drill chucks and collets sized for 0.1590-inch shank diameter. This is a heavy-duty grade bit conforming to ASME B94.11M and ANSI specification designation standards.

Key Features

• M42 cobalt steel construction for extended tool life in hard and abrasive materials
• 135-degree split point for reduced thrust and self-centering entry
• Parabolic flute design for fast, clean chip evacuation
• Web-thinned, parallel web configuration reduces cutting resistance
• Screw machine (stub) length increases rigidity and reduces deflection
• Diameter tolerance held to +0.0000 to -0.0007 inches for precise hole sizing

Compatibility

Designed as an OEM-style replacement or direct substitute for standard No. 21 wire size screw machine length drill bits used in production drilling applications with alloy steel and aluminum workpieces.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with drill press or CNC machine operation. Secure the shank fully in the chuck or collet before engaging the spindle. Power down and lock out the machine before changing bits. Do not exceed the speed and feed recommendations for the workpiece material and bit diameter.