Cleveland C70142 Cobalt Jobber Drill Bit No. 9 135 Deg

Product Description

The CLEVELAND C70142 is a cobalt jobber-length drill bit designed for demanding metal drilling applications where standard high-speed steel falls short. Built from M42 cobalt steel, this bit delivers superior heat and wear resistance, making it a dependable choice for production drilling in tough materials. It features a 135-degree split point for fast penetration and reduced walking without a center punch, and a gold oxide coating that further improves surface hardness and lubricity. The wire gauge size is No. 9, with a decimal diameter of 0.196 inches, and the overall length is 3-5/8 inches. Installation and use are appropriate for machining shops, fabrication environments, and field trade professionals working with metal substrates.

This bit is rated for aluminum as a primary workpiece material and is well-suited for general-purpose metal drilling where a cobalt-grade, heavy-duty bit is required. The spiral flute design evacuates chips efficiently in through-hole and blind-hole drilling scenarios. The straight-cylindrical shank with a diameter of 0.196 inches seats directly into standard drill chucks found on drill presses, hand drills, and CNC equipment. The bit conforms to NAS 907 Type J specification, which is a common aerospace and industrial procurement standard for jobber-length drills.

Key Features

• M42 cobalt steel construction for extended tool life in abrasive and high-heat drilling conditions
• 135-degree split point reduces thrust force and eliminates the need for center punching
• Gold oxide coating improves lubricity and surface hardness
• Regular spiral flute with web-thinned, tapered web for efficient chip evacuation
• Straight-cylindrical shank fits standard drill chucks without adapters
• Meets NAS 907 Type J specification for consistent dimensional tolerances

Compatibility

Designed as a jobber-length drill bit for use with standard drill chucks accepting a 0.196-inch straight-cylindrical shank. Rated for aluminum as the primary workpiece material and appropriate for general heavy-duty metal drilling applications per NAS 907 Type J classification.

Installation Notes

This bit is installed by machinists and trade professionals using drill presses, portable electric drills, or CNC drilling equipment. Secure the straight shank fully in the chuck and verify concentricity before drilling under load. Use appropriate cutting fluid or coolant when drilling steel or other ferrous materials to extend tool life, noting that this bit does not support coolant-through delivery. Inspect the cutting edges for wear or chipping before each use, and replace when the split point shows signs of dulling to maintain hole-size accuracy within the stated tolerance of -0.0007 to 0.0000 inches.