Cleveland C70131 Cobalt Jobber Drill Bit 12 Mm

Product Description

The CLEVELAND C70131 is a cobalt jobber-length drill bit built for heavy-duty metal cutting in professional shop and field environments. It measures 12 mm (0.4724 inches) in diameter with an overall length of 5.94 inches and a flute length of 3.976 inches. The 135-degree split point reduces walking on entry and lowers the thrust required to start a hole, making it well suited for interrupted cuts and hard materials. The gold oxide coating adds surface hardness and lubricity. Machinists, tool-and-die technicians, and maintenance tradespeople install this bit in standard drill presses, CNC machines, and hand-held power drills.

This bit is designed for drilling aluminum and similar non-ferrous and ferrous materials where a durable cobalt substrate and consistent dimensional tolerance are required. The straight-cylindrical shank (0.4724 inches diameter) fits standard three-jaw chucks without an adapter. The two-flute regular spiral geometry clears chips efficiently in through-hole and blind-hole applications. It conforms to NAS 907 Type J standards, making it appropriate for aerospace-adjacent MRO and production work where specification compliance is required.

Key Features

• M42 cobalt high-speed steel construction for extended tool life in abrasive and work-hardening materials
• 135-degree split point reduces entry walking and lowers drilling thrust
• Gold oxide coating improves lubricity and surface hardness
• Web-thinned tapered web design reduces cutting resistance and heat buildup
• Straight-cylindrical shank at 0.4724 inches fits standard chuck sizes without adapters
• Meets NAS 907 Type J specification for controlled dimensional tolerances

Compatibility

Designed as an OEM-specification replacement or production drill bit for use in standard drill chucks accepting a 0.4724-inch straight shank, conforming to NAS 907 Type J dimensional requirements.

Installation Notes

Installation and use should be performed by qualified machinists or tradespeople familiar with drill press and rotary tool operation. Secure the shank fully in the chuck and verify runout before cutting. Use appropriate cutting fluid for the workpiece material to manage heat and extend bit life. Inspect the cutting edges for wear before each use and avoid running the bit at speeds outside the recommended range for the workpiece material and bit diameter.