Cleveland C14286 Drill Bit Letter F 135 Point Cobalt

Product Description

The CLEVELAND C14286 is a cobalt screw machine length drill bit sized to Letter F (0.2570 inches diameter) with a 135-degree split point and parabolic flute geometry. Built to ASME B94.11M standards and designated as heavy-duty grade, this bit is designed for drilling into tough materials including alloy steels and aluminum. The M42 cobalt material grade provides elevated heat and wear resistance compared to standard high-speed steel, making it a dependable choice in production drilling environments. Diameter tolerance is held to +0.0000 to -0.0010 inches for precision fitment in tight-tolerance applications.

This screw machine length drill bit is suited for metalworking operations in both shop and field settings where a shorter, stiffer drill profile is preferred over jobber-length bits. The reduced overall length improves rigidity and minimizes deflection in CNC machining centers, drill presses, and manual drilling setups. It is commonly installed by machinists and tool-and-die professionals working with alloy steels and aluminum stock. The parabolic flute design promotes efficient chip evacuation, reducing heat buildup and improving hole quality in deeper cuts.

Key Features

• Letter F diameter (0.2570 inches) with a diameter tolerance of +0.0000 to -0.0010 inches
• 135-degree split point with web thinning for reduced thrust and self-centering starts
• M42 cobalt construction provides superior heat resistance for hard and abrasive materials
• Parabolic 2-flute geometry promotes fast chip evacuation and reduces heat buildup
• Screw machine length (2-5/8 inches OAL) delivers added rigidity versus jobber-length drills
• Parallel web configuration with straight-cylindrical shank for consistent, secure chuck grip
• Meets ASME B94.11M standard; ANSI specification designation

Compatibility

Designed as an OEM-style replacement or direct-use screw machine drill bit for heavy-duty metalworking applications in 3-jaw chucks and collet systems accepting a 0.2570-inch straight-cylindrical shank. Compatible with primary workpiece materials listed as alloy steel and aluminum per manufacturer specifications.

Installation Notes

Installation and use should be performed by qualified machinists or metalworking professionals familiar with safe drill press, CNC, or manual drilling practices. Secure the shank fully in the chuck or collet before operation and verify no runout before engaging the workpiece. Coolant-through is not supported on this bit; external coolant or cutting fluid is recommended when drilling alloy steels to manage heat. Inspect the cutting edges for wear or chipping before each use and replace the bit if the point geometry is compromised.