Cleveland C15118 Screw Machine Drill Bit No 28 Cobalt

Product Description

The CLEVELAND C15118 is a screw machine length drill bit designed for high-speed, high-heat drilling applications across a wide range of materials. Built from M42 cobalt high-speed steel and coated with TiAlN for enhanced heat and wear resistance, this bit handles demanding production environments where standard HSS tooling falls short. It carries a No. 28 wire gauge size, equating to 0.1405 inches in diameter, with a 135-degree split point for self-centering entry and reduced walking on hard surfaces. Overall length is 1-15/16 inches with a 15/16-inch flute length. Machinists, tool and die technicians, and maintenance professionals install this bit in drill presses, CNC machines, and hand-held power tools.

This bit is suited for drilling aluminum, brass, carbon steel, cast iron, nickel alloys, plastics, stainless steel, and tool steel. The screw machine length profile — shorter than jobber length — provides added rigidity in tight setups and is a common choice in production machining environments where chatter and deflection need to be minimized. It is appropriate for both manual and CNC drilling operations.

Key Features

• M42 cobalt construction handles elevated cutting temperatures without losing hardness
• TiAlN coating extends tool life in abrasive and high-temperature applications
• 135-degree split point self-centers on entry and reduces thrust force required
• Parabolic flute geometry with parallel web configuration promotes efficient chip evacuation
• Web-thinned for reduced feed pressure and improved drilling efficiency
• Straight-cylindrical shank fits standard drill chucks without adapters
• Right-hand cut with ANSI specification designation for consistent dimensional compliance

Compatibility

Designed as a replacement or production-stock drill bit for use in standard drill chucks and collets accepting a 0.1405-inch straight-cylindrical shank, compatible with drill presses, CNC machining centers, and power hand tools across industrial and maintenance applications.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with cutting tool selection and machine tool operation. Secure the shank fully in the chuck and verify runout before drilling. Power down and de-energize the machine before changing tooling. Always use appropriate cutting fluid or coolant for the workpiece material being drilled, even though this bit does not have through-coolant capability.