Chicago-latrobe 54020 Cobalt Drill Bit No. 10 Tin

Product Description

The CHICAGO-LATROBE 54020 is a cobalt jobber length drill bit in wire gauge size No. 10, equivalent to 0.1935 inches in diameter. Built to the M42 cobalt grade standard and finished with a titanium nitride (TiN) coating, this bit is engineered for demanding drilling applications where standard high-speed steel falls short. The 135-degree split point starts on contact without walking, reducing the need for a center punch. The two-flute spiral design with a tapered, web-thinned construction channels chips efficiently while maintaining cutting edge integrity. Licensed HVAC techs, plumbers, electricians, and pipefitters working with hard materials reach for cobalt bits like this when production drilling or working with resistant alloys.

This drill bit is rated for primary use in stainless steel and steel, making it well suited for trade professionals who drill structural steel, pipe, plate, or stainless fastener clearance holes in the field or in a shop environment. At 3.625 inches overall length with a 2.4375-inch flute length and a straight cylindrical shank, it fits standard drill chucks without adapters. The Series 2550 design conforms to DIN 338 and NAS 907 Type J standards, meaning it meets recognized dimensional and performance specifications used across aerospace, industrial, and mechanical trade work.

Key Features

• M42 cobalt material grade for high heat resistance and extended tool life in hard metals
• Titanium nitride (TiN) coating reduces friction and increases surface hardness
• 135-degree split point with web thinning for self-centering starts and reduced thrust
• Right-hand cut, regular spiral flute for efficient chip evacuation
• Straight cylindrical shank fits standard drill chucks without modification
• Conforms to DIN 338 and NAS 907 Type J dimensional standards

Compatibility

Designed as a heavy-duty replacement or working stock drill bit for applications requiring a No. 10 wire gauge (0.1935 inch) hole in stainless steel or steel, conforming to NAS 907 Type J and DIN 338 specifications.

Installation Notes

This bit is installed and operated by machinists, pipefitters, electricians, and general trade professionals using standard drill presses or portable drill motors. Always secure the workpiece before drilling and use appropriate cutting fluid when drilling stainless steel to extend tool life and prevent work hardening. Match spindle speed to the material and bit diameter per established speeds-and-feeds tables. Inspect the cutting edge before each use and replace the bit if the point shows signs of chipping or heat discoloration.