Cleveland C70051 Cobalt Jobber Drill Bit 9.35mm 135

Product Description

The CLEVELAND C70051 is a cobalt jobber length drill bit designed for heavy-duty metal drilling applications. Built from M42 cobalt high-speed steel, it delivers the hardness and heat resistance needed when cutting through tough materials including aluminum and other metals. The bit features a 135-degree split point that reduces walking and lowers the thrust required to start a hole. A gold oxide finish provides added lubricity and corrosion resistance. The two-flute spiral design with a web-thinned, tapered web promotes efficient chip evacuation. Machinists, fabricators, and maintenance technicians working with drill presses or hand drills rely on this bit for consistent, accurate hole production.

The C70051 is suited for industrial and production environments where standard high-speed steel bits wear prematurely. Its 9.35 mm diameter (0.3680 inch) and 5 inch overall length make it a standard jobber-length tool compatible with most drill chucks and CNC spindles. Primary workpiece material guidance from the manufacturer identifies aluminum as a target material, though the M42 cobalt grade also handles other metals encountered in general metalworking and maintenance work. The straight cylindrical shank fits conventional three-jaw drill chucks without modification.

Key Features

• M42 cobalt high-speed steel construction for elevated heat and wear resistance
• 135-degree split point reduces skating and lowers required feed force
• Gold oxide coating adds lubricity and surface protection
• Web-thinned, tapered web improves chip clearance and reduces torque demand
• Straight cylindrical shank at 0.3680 inch diameter fits standard drill chucks
• Meets NAS 907 Type J specification for dimensional and performance consistency

Compatibility

Designed as a standard jobber-length drill bit for use in drill presses, hand drills, and CNC machining spindles that accept a straight cylindrical shank in the 0.3500 to 0.4000 inch range.

Installation Notes

Installation is performed by machinists and maintenance technicians following standard machine shop or field drilling procedures. Secure the shank fully in the chuck and verify runout before beginning a cut. Ensure the workpiece is clamped or fixtured to prevent movement during drilling. Appropriate cutting fluid or lubricant is recommended to extend tool life when drilling ferrous materials.