Cleveland C70187 Cobalt Jobber Drill Bit Size 54

Product Description

The CLEVELAND C70187 is a cobalt jobber length drill bit in wire gauge size 54, with a decimal diameter of 0.0550 inches and a 135-degree split-point angle. Built to M42 cobalt steel grade, this bit carries a gold oxide coating that improves heat resistance and extends tool life during demanding drilling operations. The overall length is 1-7/8 inches, with a 7/8-inch flute length and a straight-cylindrical shank. It is classified as a heavy-duty bit and meets NAS 907 Type J standards. Machinists, tool-and-die technicians, and maintenance professionals install this bit for precision small-diameter work.

The C70187 is rated for aluminum as its primary workpiece material and is well suited to applications requiring tight-tolerance small-diameter holes. Its regular spiral flute geometry and right-hand cutting direction make it a standard choice for CNC machining centers, drill presses, and hand-held drilling in light metals and soft alloys. The web-thinned, tapered web configuration reduces thrust and improves chip evacuation, which is especially useful when drilling shallow holes in sheet stock or castings. This bit is sold individually and is available in a minimum order quantity of 12 units.

Key Features

• M42 cobalt steel construction for elevated heat and wear resistance
• Gold oxide coating reduces friction and extends bit life
• 135-degree split-point angle for fast, accurate starts without a center punch
• Web-thinned tapered web reduces drilling thrust and improves chip clearance
• Right-hand spiral flute with regular helix for consistent chip evacuation
• Meets NAS 907 Type J specification for precision dimensional control

Compatibility

Designed as a heavy-duty OEM-style jobber length drill bit suited for standard drill chucks accepting a 0.0550-inch straight-cylindrical shank, compatible with CNC machining centers, drill presses, and portable drills used in metalworking and maintenance applications.

Installation Notes

This bit is installed by machinists and maintenance technicians using standard drill chucks or collet systems rated for the 0.0550-inch shank diameter. Ensure the chuck is fully tightened and the workpiece is securely clamped before operation. Use appropriate cutting fluid or lubricant when drilling aluminum or other metals to maintain bit temperature and surface finish quality. Inspect the cutting edges before each use and replace the bit if chipping or wear is observed.