Chicago-latrobe 70128 No. 28 Hss Tin Drill Bit

Product Description

The CHICAGO-LATROBE 70128 is a jobber-length twist drill bit in wire gauge size No. 28, with a decimal diameter of 0.1405 inches. Built from high speed steel (HSS) with a titanium nitride (TiN) coating, it delivers improved surface hardness and extended tool life compared to uncoated HSS bits. The 118-degree standard point angle suits a broad range of metalworking applications. Overall length is 2.875 inches, with a 1.75-inch flute length and a straight-cylindrical shank of 0.1405 inches in diameter. The bit features a web-thinned, tapered web configuration and a regular spiral flute with right-hand cutting direction. It is part of the Series 150T general-purpose line and conforms to DIN 338 standards.

This bit is suited for production and maintenance drilling in cast iron and steel, covering a wide range of residential, commercial, and light industrial applications. The general-purpose tool performance rating makes it a practical choice for HVAC technicians, pipefitters, electricians, and machinists who need a reliable small-diameter drill for sheet metal, structural steel, and ferrous cast components. It is sold individually but requires a minimum order quantity of 12 units per purchase.

Key Features

• Wire gauge size No. 28, 0.1405 inches decimal diameter for precise small-hole drilling
• Titanium nitride (TiN) coating increases surface hardness and reduces friction for longer tool life
• 118-degree standard point angle for general-purpose use on cast iron and steel
• Web-thinned, tapered web reduces thrust force and improves chip evacuation
• Right-hand spiral flute with regular helix promotes efficient chip removal
• Conforms to DIN 338 standard for jobber-length drill geometry

Compatibility

Designed as a general-purpose jobber-length drill bit compatible with standard 3-jaw drill chucks and keyless chucks accepting straight-cylindrical shanks up to 0.1405 inches. Rated for use on primary workpiece materials including cast iron and steel.

Installation Notes

Installation is performed by machinists, maintenance technicians, or trade professionals using a standard drill press, hand drill, or CNC machine with an appropriate chuck. Secure the straight-cylindrical shank firmly in the chuck before operation and verify the workpiece is clamped or fixtured to prevent movement. Cutting fluid or light oil is recommended when drilling ferrous materials to extend bit life and manage heat buildup. Do not exceed the drill press or tool manufacturer rated speed for this bit diameter.