Cleveland C16581 Jobber Drill Bit 15/32 in Cobalt

Product Description

The CLEVELAND C16581 is a heavy-duty jobber length drill bit designed for demanding metal drilling applications. Built from M42 cobalt high-speed steel, it delivers superior heat resistance and edge retention when cutting through tough materials. The 135-degree split point initiates cutting immediately with minimal walking, and the web-thinned, tapered web design reduces thrust requirements at the start of the cut. The gold oxide coating provides additional lubricity and corrosion resistance. At 5.75 inches overall length with a parabolic flute profile, this bit moves chips efficiently out of the hole. It is suited for use by machinists, maintenance mechanics, and industrial tradespeople working in fabrication, MRO, and production environments.

The C16581 is engineered for drilling cast iron, non-ferrous metals, stainless steel, and carbon steel. The parabolic flute geometry provides fast chip evacuation, making it effective in deeper hole applications where chip packing is a common issue. The straight cylindrical shank measures 15/32 inches in diameter, matching the drill diameter for compatibility with standard keyed and keyless chucks. This bit is built to ASME B94.11M and DIN 338 standards, confirming dimensional consistency for precision work across manual drill presses, CNC machines, and portable drilling equipment.

Key Features

• M42 cobalt steel construction provides heat resistance for high-speed drilling in hard metals including stainless steel
• 135-degree split point reduces walking on entry and lowers required thrust force
• Parabolic flute design promotes rapid chip evacuation in deeper holes
• Gold oxide dual coating adds surface lubricity and protects against corrosion during storage and use
• Web-thinned tapered web reduces cutting resistance at drill initiation
• Meets ASME B94.11M and DIN 338 dimensional standards for consistent fitment in production tooling setups

Compatibility

Designed for use with standard 15/32-inch-capacity keyed or keyless drill chucks on drill presses, milling machines, and portable drilling equipment. Rated for cast iron, non-ferrous metals, stainless steel, and carbon steel workpieces as specified by the manufacturer.

Installation Notes

Install in a clean, properly sized drill chuck and tighten securely before operation to prevent bit slippage and runout. Always clamp the workpiece firmly; never hold it by hand when using a drill press or milling machine. Use appropriate cutting fluid when drilling stainless steel or cast iron to extend tool life and improve hole quality. Inspect the cutting edges for chipping or wear before each use, as a damaged split point will produce oversized or out-of-round holes.