Cleveland C70186 Cobalt Jobber Drill Bit Wire Size 53

Product Description

The CLEVELAND C70186 is a cobalt M42 jobber-length drill bit sized to wire gauge number 53, with a decimal diameter of 0.0595 inches. It features a 135-degree split point and a spiral flute with web-thinning for reduced thrust on entry. The gold oxide coating improves surface hardness and heat resistance during high-speed drilling. At 1-7/8 inches overall length with a 7/8-inch flute length, this bit is built for precision work in tight-clearance drilling applications. A licensed machinist, maintenance technician, or production drill press operator would typically select this size for small-diameter through-hole work.

This bit is suited for drilling aluminum and other non-ferrous metals where dimensional accuracy and clean hole entry are critical. The straight cylindrical shank seats securely in standard drill chucks and collet systems used across CNC drill presses, hand drills, and benchtop drilling equipment. The two-flute spiral design evacuates chips efficiently in short-depth hole applications common in light manufacturing, HVAC component fabrication, and sheet-metal work. It meets NAS 907 Type J specification, making it appropriate for aerospace and defense maintenance environments where material certifications are required.

Key Features

• Cobalt M42 material grade for heat resistance and extended tool life in abrasive materials
• 135-degree split point with web-thinning reduces walking and lowers feed force at drill entry
• Gold oxide coating provides surface lubricity and mild thermal protection
• Tapered web configuration with regular spiral maintains rigidity at small diameters
• Meets NAS 907 Type J standard for controlled dimensional tolerances
• Diameter tolerance of -0.0005 to 0.0000 inches ensures consistent hole sizing

Compatibility

Designed as an OEM-compatible replacement or standard stock bit for applications requiring a wire gauge number 53 drill in cobalt construction, compatible with any standard straight-shank drill chuck or collet accepting a 0.0595-inch shank diameter.

Installation Notes

This bit is installed by machinists and maintenance technicians using standard drill chucks or collet holders on benchtop, floor, or CNC drilling equipment. Ensure the machine is powered down and the chuck is fully tightened before operation. Use appropriate cutting fluid or mist coolant when drilling metals to extend bit life. Do not exceed recommended spindle speeds for the workpiece material and bit diameter.