Cleveland C70145 Cobalt Jobber Drill Bit No. 12 135 Deg

Product Description

The CLEVELAND C70145 is a cobalt jobber length drill bit in wire gauge size No. 12, with a decimal diameter of 0.1890 inches. Built from M42 cobalt high-speed steel and finished with a gold oxide coating, this bit is engineered for heavy-duty drilling applications where heat and wear resistance are critical. It features a 135-degree split point for fast penetration and reduced walking on entry. The overall length is 3.5 inches, with a 2-5/16-inch spiral flute and a straight cylindrical shank. Machinists, maintenance technicians, and metalworking professionals install this bit in drill presses and handheld power drills alike.

This bit is rated for use in aluminum as the primary workpiece material and is well suited to production and maintenance drilling in both shop and field environments. The regular spiral flute and web-thinned, tapered web design promote efficient chip evacuation and reduce thrust load during drilling. It conforms to NAS 907 Type J standards, making it appropriate for aerospace and precision manufacturing environments where dimensional accuracy and material compliance are required. Series 2213 identifies this as a standard Cleveland heavy-duty cobalt jobber line.

Key Features

• M42 cobalt HSS construction for extended tool life in abrasive and heat-generating applications
• Gold oxide coating reduces friction and provides corrosion resistance
• 135-degree split point reduces entry walking and lowers required thrust force
• Web-thinned tapered web improves chip flow and reduces heat buildup at the tip
• Right-hand cut, regular spiral flute with 2-5/16-inch flute length
• Meets NAS 907 Type J specification for use in controlled manufacturing environments

Compatibility

Designed as an OEM-style replacement or direct-application jobber drill bit for use in standard straight-shank drill chucks; primary workpiece material rated for aluminum per manufacturer specification.

Installation Notes

This bit is installed by machinists and maintenance technicians using standard drill presses, CNC drilling equipment, or handheld power drills with compatible straight-shank chucks. Secure the shank fully in the chuck before operation and verify drill speed is appropriate for the workpiece material and bit diameter. Do not exceed the rated capacity of the drilling equipment. Inspect the cutting edges and point geometry before each use and replace if chipping or wear is observed.