Chicago-latrobe 70307 Drill Bit Letter G Hss Tin

Product Description

The CHICAGO-LATROBE 70307 is a jobber length drill bit in letter size G (0.2610 inches decimal equivalent), designed for general-purpose drilling in steel and cast iron. Built from high speed steel with a titanium nitride (TiN) coating, this bit delivers improved surface hardness and wear resistance compared to uncoated HSS tooling. The 118-degree standard point angle suits a wide range of ferrous metals and common workpiece materials. With a regular spiral flute, web-thinned tip, and straight-cylindrical shank, the 70307 fits standard drill chucks and is a practical stock item for machine shops, maintenance trades, and fabrication environments.

This bit is rated for use in cast iron and steel, making it appropriate for HVAC fabrication work, mechanical contractors, pipefitters, and general metalworking applications. The overall length of 4.125 inches with a flute length of 2.875 inches accommodates typical jobber drilling depth requirements. The Series 150T designation places this bit within a well-established general-purpose product line conforming to DIN 338 standards. It is sold individually and well suited to both production drilling and field repair situations where consistent hole sizing to letter G specification is required.

Key Features

• Letter G size — 0.2610 inch decimal equivalent diameter
• Titanium nitride (TiN) coating for extended tool life and reduced friction
• 118-degree standard point angle with web-thinned, tapered web configuration
• High speed steel construction rated for cast iron and steel workpieces
• Regular spiral, 2-flute design with right-hand cutting direction
• Conforms to DIN 338 standard; Series 150T general-purpose classification

Compatibility

Designed for use with standard drill chucks accepting a 0.2610-inch straight-cylindrical shank. Primary workpiece materials are cast iron and steel. General-purpose fitment for jobber-length drilling applications per DIN 338.

Installation Notes

Installation and use should be performed by machinists, maintenance technicians, or qualified trade professionals familiar with drill press or hand-drill operation. Secure the workpiece before drilling and verify chuck tightness before spindle engagement. Always wear appropriate eye protection and follow applicable shop safety protocols. Do not exceed the recommended feed and speed parameters for the workpiece material and bit diameter.