Cleveland C15994 Cobalt Drill Bit 1/2 Inch 135 Degree

Product Description

The CLEVELAND C15994 is a heavy-duty cobalt jobber length drill bit designed for cutting hard and difficult-to-machine materials. Built to Series 3780 specifications, it features a 1/2 inch diameter, a 135-degree split point for self-centering penetration with reduced walking, and a cobalt oxide coating that adds heat and wear resistance. The M42 cobalt steel construction maintains cutting hardness at elevated temperatures, making it well suited for demanding production and field drilling applications. Licensed tradespeople and machinists working with tough base materials rely on this bit for consistent, accurate hole geometry.

This drill bit is primarily intended for drilling superalloys and other hard metals where standard high-speed steel bits wear prematurely. The fast spiral flute design promotes efficient chip evacuation during deep-hole drilling. With a straight-cylindrical shank at 1/2 inch diameter, it seats directly in standard drill chucks without adapters. It is appropriate for both manual drill press setups and CNC drilling operations in industrial, maintenance, and fabrication environments.

Key Features

• M42 cobalt steel construction retains hardness under high-heat cutting conditions
• 135-degree split point reduces thrust force and eliminates center-punch requirement on most materials
• Cobalt oxide coating improves surface lubricity and extends service life
• Fast spiral flute geometry accelerates chip removal and reduces heat buildup in the cut zone
• Web-thinned, tapered web configuration reduces cutting resistance and improves penetration rate
• Conforms to ASME B94.11M and NAS specification designations for dimensional accuracy

Compatibility

Designed for use in standard 1/2 inch drill chucks on drill presses, hand drills, and CNC machining centers. Primary workpiece material designation is superalloy; also suitable for stainless steel, hardened steel, and other high-strength ferrous metals where cobalt-grade tooling is specified.

Installation Notes

Secure the straight-cylindrical shank firmly in a properly sized drill chuck before operation. Always wear appropriate eye protection and follow applicable shop safety procedures when operating drilling equipment. Use cutting fluid or coolant where possible to maximize tool life when drilling superalloys or hardened materials, as this bit is rated for non-coolant-through use only. Inspect the cutting edges and split point for wear before each use and replace the bit if chipping or dulling is observed.