Chicago-latrobe 54104 Cobalt Drill Bit Letter D 0.2460 in

Product Description

The CHICAGO-LATROBE 54104 is a cobalt jobber length drill bit sized to Letter D (0.2460 inches), designed for high-performance drilling in tough materials including stainless steel and alloy steels. Built to M42 cobalt high-speed steel construction and coated with titanium nitride (TiN), this bit delivers extended wear life and reduced heat buildup during cutting. The 135-degree split point geometry reduces walking at startup and lowers thrust requirements compared to a standard 118-degree point. With a 4.0-inch overall length and a 2-3/4-inch spiral flute, this is a heavy-duty tool engineered for production and maintenance drilling environments where tooling consistency matters.

This drill bit is suited for metalworking applications in both shop and field environments. Its primary target materials are stainless steel and carbon and alloy steels, making it a practical choice for HVAC fabrication, pipefitting, electrical rough-in, and general mechanical trade work where hole quality and bit longevity are critical. The straight-cylindrical shank is compatible with standard drill chucks and quick-change holders. The Series 2550 designation indicates compliance with DIN 338 and NAS 907 Type J standards, confirming dimensional and performance consistency across the production run.

Key Features

• M42 cobalt high-speed steel construction for heat and wear resistance in hard metals
• TiN coating extends tool life and reduces friction at the cutting edge
• 135-degree split point reduces drill walking and lowers axial thrust force
• Regular spiral flute with web-thinned, tapered web for improved chip evacuation
• Right-hand cut with 2-flute spiral configuration for standard drilling operations
• Meets DIN 338 and NAS 907 Type J standards for dimensional accuracy

Compatibility

Designed as a direct-fit jobber length drill bit for use in standard 3-jaw chucks and quick-change drill chuck systems accepting a 0.2460-inch straight-cylindrical shank. Compliant with NAS 907 Type J and DIN 338 specifications.

Installation Notes

This bit is installed and operated by machinists, pipefitters, and trade mechanics using standard drill presses, magnetic drills, or hand-held power drills. Secure the shank fully in the chuck before operation and verify chuck runout is within acceptable limits to protect the close-tolerance shank diameter. When drilling stainless steel, use appropriate cutting fluid and avoid dwelling at reduced feed rates, which can work-harden the material. Follow applicable shop safety standards and use proper eye and hand protection during all drilling operations.