Chicago-latrobe 70314 Letter N Hss Tin Drill Bit

Product Description

The CHICAGO-LATROBE 70314 is a jobber length drill bit sized to Letter N (0.3020 inches) with a 118-degree standard point angle. It is manufactured from high speed steel with a titanium nitride (TiN) coating that increases surface hardness and extends tool life in repetitive drilling applications. The bit features a right-hand spiral flute with web thinning and a tapered web configuration to reduce thrust and improve chip evacuation. Overall length is 4.375 inches with a 3.0625-inch flute length and a straight-cylindrical shank. This bit is suited for machinists, maintenance technicians, and trade professionals who require a general-purpose jobber drill for production or field use.

The 70314 is rated for use in cast iron and steel as primary workpiece materials, making it a practical choice for HVAC, plumbing, and electrical trades when drilling into ferrous fastener points, structural steel members, or cast iron fittings. The 2-flute spiral design and TiN coating support repeated use across common trade drilling tasks. The straight-cylindrical shank fits standard three-jaw drill chucks found on corded drills, drill presses, and right-angle drill attachments. This bit carries the Series 150T designation and meets DIN 338 standards for jobber length geometry.

Key Features

• Letter N size, 0.3020 inches diameter, with a diameter tolerance of -0.0010 to 0.0000 inches
• 118-degree standard point angle with web-thinned, tapered web for reduced drilling thrust
• Titanium nitride (TiN) coating over high speed steel for increased wear resistance
• Right-hand cut, 2-flute regular spiral design promotes efficient chip removal
• Straight-cylindrical shank compatible with standard drill chucks
• Meets DIN 338 jobber length standard; Series 150T general-purpose classification

Compatibility

Designed as a general-purpose jobber length drill bit compatible with any standard three-jaw drill chuck that accepts a 0.3020-inch straight-cylindrical shank. Rated for cast iron and steel workpiece materials per Series 150T specifications.

Installation Notes

Install into a properly sized drill chuck and tighten securely before use. Machinists and trade technicians should verify chuck capacity matches the 0.3020-inch shank diameter before seating the bit. Use appropriate cutting fluid or coolant when drilling steel to manage heat buildup, particularly in production or deep-hole applications. Inspect the cutting edges and TiN coating for wear before each use and replace if chipping or diameter undersize is observed.