Chicago-latrobe 54078 Jobber Drill Bit Wire 43 Cobalt Tin

Product Description

The CHICAGO-LATROBE 54078 is a cobalt jobber length drill bit in wire gauge size 43 (0.0890 inches decimal), designed for high-performance drilling in tough materials. Built from M42 cobalt high-speed steel and coated with titanium nitride (TiN), this bit delivers extended tool life and reduced heat buildup during continuous use. The 135-degree split point geometry allows for self-centering starts without a center punch, minimizing walking on hard surfaces. With a 2-flute right-hand spiral flute design and an overall length of 2.25 inches, this bit is suited for precision work in tight spaces. HVAC techs, pipefitters, machinists, and general maintenance trades rely on this type of bit for drilling into stainless steel, alloy steel, and other ferrous metals.

The 54078 is a heavy-duty jobber bit intended for use on stainless steel and steel workpieces where standard HSS bits fall short. The 1.25-inch flute length and straight cylindrical shank (0.0890 inches diameter) make it compatible with standard drill chucks across corded and cordless platforms. The tapered web configuration with web thinning reduces thrust requirements and improves chip evacuation. It conforms to DIN 338 and NAS 907 Type J standards, making it appropriate for aerospace-adjacent and precision fabrication work where specification compliance matters.

Key Features

• M42 cobalt steel construction for heat resistance and edge retention in hard materials
• TiN coating reduces friction and extends cutting life in repetitive drilling applications
• 135-degree split point for self-centering starts without center punch prep
• Web-thinned tapered web reduces feed pressure and improves chip clearance
• Right-hand spiral flute with regular spiral type for consistent chip evacuation
• Meets DIN 338 and NAS 907 Type J specifications for precision and aerospace use

Compatibility

Designed for drilling stainless steel and steel workpieces. Straight cylindrical shank fits standard 3-jaw drill chucks. Suitable for applications requiring NAS 907 Type J or DIN 338 compliant tooling.

Installation Notes

This bit is installed by qualified machinists, maintenance technicians, pipefitters, and HVAC or plumbing tradespeople using standard drill equipment. Secure the straight shank fully in the chuck before operation and confirm the chuck is tightened to avoid slippage. When drilling stainless steel, use a cutting fluid or coolant to control heat buildup and prolong cutting edge life. Operate at reduced RPM with consistent feed pressure to prevent work hardening of the material.