Cleveland C70052 Cobalt Jobber Drill Bit 9.58mm

Product Description

The CLEVELAND C70052 is a cobalt jobber-length drill bit built for heavy-duty drilling in aluminum and other demanding workpiece materials. Ground from M42 cobalt high-speed steel and finished with a gold oxide coating, it delivers extended tool life compared to standard HSS bits when cutting through abrasive or work-hardening materials. The split-point tip at 135 degrees reduces walking and allows drilling without a center punch on most surfaces. At 5 inches overall length with a 3.625-inch flute length and a 0.3770-inch straight-cylindrical shank, it fits standard drill chucks and CNC machine spindles. This bit meets NAS 907 Type J standards and is classified as a heavy-duty grade tool suitable for production and maintenance environments.

The C70052 is sized at 9.58 mm (0.3770 inches) and falls within the 9.00 to 10.00 mm range covered by Series 2213. It is used across metalworking, fabrication, and maintenance applications where a reliable cobalt bit is required for aluminum, softer steels, and similar materials. The regular spiral flute promotes chip evacuation, and the two-flute design keeps cutting forces manageable across a range of feed rates and spindle speeds. Typical users include machinists, maintenance mechanics, and fabricators working in shop or field environments.

Key Features

• M42 cobalt high-speed steel construction for extended tool life in abrasive materials
• Gold oxide coating reduces friction and provides visual wear indication
• 135-degree split-point tip reduces thrust and eliminates walking on entry
• Web-thinned tapered web for easier chip clearance and reduced cutting resistance
• Meets NAS 907 Type J specification for dimensional and performance consistency
• No coolant-through design — suitable for standard drill press, hand drill, and CNC applications without internal coolant supply

Compatibility

Designed as a jobber-length replacement or production drill bit for use in standard straight-shank drill chucks and machine tool spindles accepting a 0.3770-inch shank. Series 2213 bits in this size range are commonly used in NAS-specification metalworking applications involving aluminum and similar workpiece materials.

Installation Notes

This bit is installed by a machinist or maintenance mechanic into a keyed or keyless drill chuck or collet system. Always secure the shank fully within the chuck jaws before operation, and ensure the machine spindle is completely stopped before changing bits. Apply cutting fluid appropriate to the workpiece material to manage heat and extend bit life. Follow shop safety protocols and applicable OSHA machine guarding requirements when operating drilling equipment.