Cleveland C16611 Cobalt Jobber Drill Bit 12.5 Mm

Product Description

The CLEVELAND C16611 is a cobalt jobber-length drill bit designed for high-demand metal drilling applications. Built from M42 cobalt high-speed steel with a gold oxide coating, this bit handles tough workpiece materials that wear out standard HSS tooling. The 135-degree split point reduces walking and lowers feed pressure at the start of the cut. The parabolic flute geometry improves chip evacuation, which is critical when drilling deep holes in dense alloys. Overall length is 5.945 inches with a straight-cylindrical shank diameter of 0.4921 inches. This is a heavy-duty grade tool intended for production and maintenance drilling in trade and industrial environments.

The C16611 is sized at 12.5 mm (0.4921 inches decimal) and is suited for drilling cast iron, stainless steel, carbon steel, and non-ferrous metals. Typical applications include fabrication shops, pipefitters and plumbers sizing holes through structural steel and plate, HVAC sheet metal and structural work, and general MRO maintenance tasks. The web-thinned, tapered web design reduces torque requirements and extends cutting life in harder materials. Two flutes provide chip clearance across a 3.9764-inch flute length.

Key Features

• M42 cobalt steel construction for extended tool life in hard and abrasive materials
• 135-degree split point reduces drill walk and lowers required thrust force
• Parabolic flute design accelerates chip removal in deep-hole drilling
• Gold oxide coating provides lubricity and heat resistance
• Web-thinned tapered web reduces torque and breakage risk
• Straight-cylindrical shank fits standard three-jaw drill chucks without adapters

Compatibility

Designed as an OEM-style heavy-duty replacement or direct-use jobber drill bit for standard drill chucks accepting a 0.4921-inch straight-cylindrical shank, conforming to ASME B94.11M and DIN 338 specifications.

Installation Notes

Install in a drill press, magnetic drill, or hand drill with a chuck rated for the shank diameter before applying power. Secure the workpiece firmly to prevent movement during the cut. Use appropriate cutting fluid when drilling stainless steel or cast iron to manage heat and extend bit life. Inspect the cutting edges before each use and replace the bit if chipping or dulling is evident to avoid workpiece damage or bit breakage.