Cleveland C16583 Cobalt Drill Bit 1/2 Inch 135 Deg

Product Description

The CLEVELAND C16583 is a heavy-duty cobalt jobber length drill bit designed for demanding metal drilling applications. Built from M42 cobalt high-speed steel and finished with a gold oxide coating, it delivers heat and wear resistance well beyond standard HSS bits. The 135-degree split point allows the bit to self-center on contact, eliminating the need for a center punch on most surfaces. At 6 inches overall length with a 4.5-inch parabolic flute, it provides efficient chip evacuation and reduced heat buildup during high-feed drilling in tough materials. Licensed machinists, tool-and-die professionals, and field tradespeople working with hard metals rely on this bit for consistent hole quality.

This bit is suited for drilling cast iron, stainless steel, carbon steel, and non-ferrous metals in both production and maintenance-repair settings. The parabolic flute geometry and web-thinned, tapered web configuration reduce thrust requirements, making it effective in handheld drill applications as well as drill press and CNC setups. It is a practical choice for HVAC, plumbing, and electrical tradespeople drilling through structural steel, equipment frames, and metal enclosures on the job site.

Key Features

• M42 cobalt steel construction for high heat resistance in hard-metal drilling
• 135-degree split point self-centers on contact, reducing walking and setup time
• Parabolic flute design promotes fast chip removal and cooler cutting
• Gold oxide finish reduces friction and extends tool life
• Web-thinned tapered web lowers drilling thrust for both machine and handheld use
• Straight-cylindrical shank fits standard 1/2-inch drill chucks
• Meets ASME B94.11M and DIN 338 standards

Compatibility

Designed for use with any drill press, handheld drill, or CNC spindle accepting a 1/2-inch straight-cylindrical shank. Rated for drilling cast iron, non-ferrous metals, stainless steel, and carbon steel.

Installation Notes

Install the shank fully into the drill chuck and tighten securely before use. Apply appropriate cutting fluid or coolant when drilling stainless steel or hardened alloys to extend bit life, even though this bit does not support through-coolant delivery. Always wear eye protection and secure the workpiece before drilling. Inspect the cutting edges before each use and replace the bit if chipping or excessive wear is observed.