Chicago-latrobe 54039 Cobalt Jobber Drill Bit Wire 29

Product Description

The CHICAGO-LATROBE 54039 is a cobalt jobber length drill bit designed for heavy-duty metal drilling applications. It carries a wire gauge size of 29, equivalent to 0.1360 inches in decimal diameter, and features a 135-degree split point for fast, self-centering starts with minimal walking. The M42 cobalt high-speed steel construction is finished with a Titanium Nitride (TiN) coating to extend tool life and reduce friction in tough materials. The two-flute spiral design with a web-thinned, tapered web improves chip evacuation and reduces thrust. Overall length is 2.875 inches with a flute length of 1.75 inches.

This drill bit is built for cutting stainless steel and other hard ferrous metals where standard HSS bits fail prematurely. It is suited for production and maintenance environments in industrial, mechanical, and trade settings. The straight-cylindrical shank seats securely in standard three-jaw chucks and quick-change systems. Licensed HVAC, plumbing, and electrical installers working with stainless enclosures, unistrut, or structural steel will find the TiN coating and cobalt substrate handle repeated high-heat drilling cycles that burn out conventional bits.

Key Features

• M42 cobalt high-speed steel construction rated for heavy-duty, high-heat drilling
• 135-degree split point with web thinning for self-centering starts and reduced thrust load
• Titanium Nitride (TiN) coating reduces friction and extends cutting edge life
• Right-hand cut, regular spiral flute promotes efficient chip removal
• Straight-cylindrical shank at 0.1360 inches diameter fits standard drill chucks
• Meets DIN 338 and NAS 907 Type J standards for consistent dimensional accuracy

Compatibility

Designed as a jobber-length replacement or production-use bit for applications requiring a wire size 29 (0.1360 inch) diameter drill in stainless steel and steel workpieces. Compatible with any standard drill press, hand drill, or CNC spindle accepting a straight-cylindrical shank of 0.1360 inches.

Installation Notes

Secure the straight shank firmly in the chuck before operation and verify runout before drilling into hardened or stainless materials. Use appropriate cutting fluid or lubricant when drilling stainless steel to reduce heat buildup and prevent work hardening at the bore entrance. Wear appropriate eye and hand protection per shop safety standards. Inspect the cutting edges for wear after extended use in abrasive or high-alloy materials, as TiN coating wear is a reliable indicator of end-of-life for the substrate.