Cleveland C70184 Cobalt Jobber Drill Bit No. 51 0.067 in

Product Description

The CLEVELAND C70184 is a cobalt jobber-length drill bit in wire gauge size No. 51, designed for heavy-duty metal drilling applications. Built from M42 cobalt high-speed steel with a gold oxide coating, it delivers extended tool life when cutting through tough or abrasive materials. The 135-degree split point reduces thrust and walking on entry, allowing cleaner, faster starts without center-punching. At 2 inches overall length with a 1-inch flute, this is a compact, precision bit suited for close-quarters drilling by machinists, maintenance technicians, and fabricators working in production or repair environments.

This bit is rated for primary use in aluminum but is suitable for a range of ferrous and non-ferrous metals where an M42 cobalt grade is appropriate. The regular spiral flute and web-thinned, tapered web geometry support efficient chip evacuation in through-hole and blind-hole applications. The straight-cylindrical shank fits standard drill chucks. It meets NAS 907 Type J specification, making it appropriate for aerospace and precision-manufacturing applications where dimensional tolerances are tightly controlled. Each unit is sold individually.

Key Features

• M42 cobalt HSS construction for heavy-duty heat and wear resistance
• 135-degree split point reduces thrust and eliminates walking on entry
• Gold oxide coating improves lubricity and extends tool life
• Web-thinned, tapered web design promotes faster chip clearing
• Straight-cylindrical shank at 0.0670 inch diameter fits standard chucks
• Meets NAS 907 Type J specification for precision and aerospace use

Compatibility

Designed as a jobber-length replacement drill bit for use in standard drill chucks and CNC drilling applications requiring a No. 51 wire gauge size at 0.0670 inch diameter.

Installation Notes

Install and remove drill bits only with the machine powered off and the spindle fully stopped. Verify the chuck is clean and the shank is fully seated before tightening. Use appropriate cutting fluid for the workpiece material to maximize bit life and hole quality. Inspect the cutting edges before each use and replace bits showing chipping, discoloration from overheating, or dimensional wear beyond tolerance.