Chicago-latrobe 70149 Jobber Length Drill Bit Wire 49

Product Description

The CHICAGO-LATROBE 70149 is a jobber length drill bit designed for general-purpose drilling in metal fabrication and maintenance applications. Built from high speed steel with a titanium nitride (TiN) coating, it delivers improved wear resistance and longer tool life compared to uncoated HSS bits. The bit is wire gauge size 49, equivalent to 0.0730 inches in diameter, with a 118-degree standard point angle and a web-thinned, tapered web configuration for easier penetration and reduced thrust. Overall length is 2 inches with a 1-inch flute length. This bit is installed and used by machinists, maintenance technicians, and sheet metal workers who require consistent, accurate small-diameter drilling.

The 70149 is suited for drilling cast iron and steel in both production and maintenance settings. Its straight-cylindrical shank accepts standard drill chucks across benchtop drill presses, hand drills, and CNC drilling setups. The regular spiral flute promotes chip evacuation in ferrous materials. Conforming to DIN 338, this bit fits into workflows where dimensional standardization is required. It is a single-piece packaged unit within the CHICAGO-LATROBE Series 150T line, which covers the 0.0500 to 0.1000 inch diameter range.

Key Features

• Wire gauge size 49 (0.0730 inches) with diameter tolerance of -0.0005 to 0.0000 inches for precise hole sizing
• Titanium nitride (TiN) coating for increased surface hardness and reduced friction
• 118-degree standard point angle with web-thinned, tapered web for reduced entry force
• Right-hand cut, regular spiral flute promotes consistent chip clearance in ferrous materials
• Straight-cylindrical shank fits standard drill chucks without adapters
• Conforms to DIN 338 dimensional standard

Compatibility

Designed as a general-purpose jobber length drill bit for use in standard drill chucks compatible with straight-cylindrical shanks; rated for drilling cast iron and steel per Series 150T specifications.

Installation Notes

Installation and use should be performed by qualified machinists or technicians familiar with small-diameter drilling operations. Secure the workpiece firmly before drilling to prevent deflection or bit breakage at this diameter. Ensure the drill chuck is properly tightened and the bit is running true before engaging the material. Do not exceed recommended feed rates for the workpiece material, as small-diameter bits are susceptible to breakage under excessive lateral load.