Cleveland C70089 Cobalt Jobber Drill Bit 4.2mm 135

Product Description

The CLEVELAND C70089 is a cobalt jobber-length drill bit designed for heavy-duty metal drilling applications. Built from M42 cobalt high-speed steel and finished with a gold oxide coating, this bit delivers extended tool life and heat resistance under demanding cutting conditions. It features a 135-degree split point for fast self-centering starts with reduced walking and thrust. The straight-cylindrical shank measures 0.1654 inches in diameter, and the overall length is 2.95 inches. With a regular spiral, two-flute design and web-thinned, tapered web configuration, the C70089 is suited for use in drill presses, CNC machines, and hand-held power drills. It is installed and operated by machinists, maintenance techs, and skilled trade professionals.

This bit is engineered for drilling aluminum as its primary workpiece material, though the M42 cobalt construction also handles other non-ferrous metals and alloys. It fits standard jobber-length applications where a compact, general-purpose drill bit is required. The 1.693-inch flute length accommodates typical hole depths in sheet stock and light structural material. It conforms to NAS 907 Type J standards, making it suitable for aerospace and precision maintenance environments where specification compliance is required.

Key Features

• M42 cobalt high-speed steel construction for elevated heat and wear resistance
• 135-degree split point reduces thrust and self-centers on contact
• Gold oxide coating helps reduce friction and improve chip evacuation
• Web-thinned, tapered web lowers cutting resistance in tough materials
• Straight-cylindrical shank compatible with standard drill chucks
• Meets NAS 907 Type J specification for precision and aerospace use

Compatibility

Designed as a jobber-length replacement drill bit compatible with standard drill chucks accepting a 0.1654-inch straight-cylindrical shank, suitable for drill presses, CNC spindles, and hand-held power drills used in metalworking and maintenance applications.

Installation Notes

This drill bit is installed by machinists and maintenance trade professionals. Secure the shank fully in the chuck and verify runout before drilling. Use appropriate cutting fluid or lubricant when drilling metals to extend tool life and maintain hole tolerance. Follow shop safety protocols including eye protection and proper workpiece clamping.