Chicago-latrobe 70301 Letter a Jobber Drill Bit Hss Tin

Product Description

The CHICAGO-LATROBE 70301 is a jobber length drill bit sized to Letter A (0.2340 inches) and built from high speed steel with a titanium nitride (TiN) coating. It is designed for general-purpose drilling in metalworking applications, delivering consistent hole quality across a range of ferrous materials. The 118-degree standard point angle and web-thinned tip reduce entry force and improve centering without requiring a pilot hole. At 3.875 inches overall length with a 2.625-inch flute, this bit fits standard drill chucks and is sized for production and maintenance drilling in shop or field settings. Machinists, tool-and-die techs, and maintenance mechanics are the primary users.

This bit is suited for drilling cast iron and steel in both shop and field environments. The straight cylindrical shank seats in standard three-jaw chucks on drill presses, hand drills, and CNC drilling setups. The regular spiral flute geometry promotes chip evacuation in through-hole and blind-hole applications. It carries a DIN 338 standard designation, making it a recognized fit for general metalworking drilling tasks in industrial, commercial, and maintenance-repair operations where a Letter A bore diameter is specified.

Key Features

• Letter A size — 0.2340 inches diameter with a tolerance of -0.0007 to 0.0000 inches
• Titanium nitride (TiN) coating increases surface hardness and extends tool life versus uncoated HSS
• 118-degree standard point angle for general-purpose entry across cast iron and steel
• Web-thinned tapered web reduces thrust and improves chip flow at the cutting tip
• 2-flute regular spiral geometry clears chips efficiently in both through and blind holes
• DIN 338 compliant — meets recognized international standards for jobber length drill bits

Compatibility

Designed as a general-purpose jobber length drill bit for use in cast iron and steel. Compatible with standard straight-shank drill chucks. Part of the CHICAGO-LATROBE Series 150T line for general metalworking applications.

Installation Notes

Installation and use of this bit is performed by machinists, maintenance mechanics, or qualified trade professionals operating drill presses, hand drills, or CNC equipment. Secure the straight cylindrical shank firmly in a properly sized chuck before operation to prevent runout. Confirm spindle speed is appropriate for the workpiece material and bit diameter — excessive speed accelerates coating wear and can damage the cutting edge. Inspect the bit for chipping or wear before each use and replace when the cutting edge shows visible degradation.