Chicago-latrobe 54119 Cobalt Drill Bit Letter T 135 Deg

Product Description

The CHICAGO-LATROBE 54119 is a cobalt steel jobber-length drill bit in letter size T, designed for high-performance drilling in ferrous and hard materials. It carries a titanium nitride (TiN) coating over an M42 cobalt substrate, a combination that extends tool life when cutting stainless steel and alloy steels. The 135-degree split point reduces thrust force and self-centers on entry, minimizing the need for a center punch. Overall length is 4-7/8 inches with a 3-1/2-inch flute length and a straight cylindrical shank diameter of 0.3580 inches. This is a heavy-duty bit built for shop and field use by machinists, pipefitters, ironworkers, and industrial maintenance technicians.

The 54119 is suited for drilling stainless steel, carbon steel, and other ferrous alloys where standard HSS bits lose edge quickly. Its regular spiral flute pattern provides efficient chip evacuation in through-hole and blind-hole applications. The straight cylindrical shank accepts standard drill chucks used in drill presses, hand drills, and magnetic-base drills. It is a single-piece, individually packaged bit appropriate for production drilling or precision repair work where dimensional accuracy and cutting consistency are required.

Key Features

• M42 cobalt steel construction for heat resistance in hard-material drilling
• TiN coating extends cutting edge life and reduces friction
• 135-degree split point for reduced thrust and self-centering entry
• Web-thinned, tapered web design improves chip flow and reduces walking
• Right-hand spiral flute with regular helix for reliable chip evacuation
• Meets DIN 338 and NAS 907 Type J standards for dimensional conformance

Compatibility

Designed as an OEM-style jobber-length drill bit for use in standard straight-shank drill chucks; primary workpiece materials per manufacturer specification are stainless steel and steel.

Installation Notes

Secure the shank fully in the drill chuck before operation and verify chuck key is removed prior to powering the tool. Use cutting fluid or coolant when drilling stainless steel to prevent work hardening and premature edge wear. Ensure the workpiece is clamped securely to a stable surface before drilling. Follow applicable shop safety standards and wear appropriate eye protection.