Chicago-latrobe 41698 No. 28 Wire Drill Bit Tin Hss

Product Description

The CHICAGO-LATROBE 41698 is a jobber-length drill bit in wire gauge size No. 28, equivalent to 0.1405 inches in decimal diameter. It is manufactured from high-speed steel (HSS) with a titanium nitride (TiN) coating that increases surface hardness and reduces friction during cutting. The 135-degree split point reduces walking on entry and lowers required thrust force, making it well suited to hard or work-hardening materials. Overall length is 2-7/8 inches with a flute length of 1-3/4 inches. This bit is part of the Series 150ASP-TN, a heavy-duty line built to NAS 907 Type B standards. It is typically installed and used by machinists, maintenance technicians, and metal fabricators.

This drill bit is designed for use in cast iron, stainless steel, and carbon steel workpieces. The 135-degree split point and TiN coating make it a practical choice for production drilling and maintenance applications where tool life and hole quality in ferrous metals are priorities. The regular spiral, two-flute geometry handles chip evacuation efficiently in these materials. The straight cylindrical shank with a 1-1/8 inch shank diameter fits standard drill chucks used in drill presses and handheld electric drills.

Key Features

• Wire size No. 28 (0.1405 inches decimal) for precise, small-diameter hole applications
• 135-degree split point reduces thrust and minimizes bit walking on entry
• TiN coating extends cutting life and reduces heat buildup on ferrous materials
• Heavy-duty HSS construction meets NAS 907 Type B specification
• Web-thinned, tapered web design improves cutting efficiency and chip flow
• Right-hand cut, regular spiral with two flutes for clean chip evacuation

Compatibility

Designed as an OEM-style replacement or direct-use jobber drill bit compatible with standard drill chucks accepting a straight cylindrical shank. Primary workpiece materials listed by the manufacturer are cast iron, stainless steel, and steel.

Installation Notes

This bit is installed by machinists and maintenance technicians in drill presses or handheld electric drills equipped with a compatible chuck. Secure the straight cylindrical shank firmly in the chuck before operation and verify the chuck is fully tightened. Use appropriate cutting fluid or coolant when drilling stainless steel or cast iron to manage heat and extend bit life. Inspect the cutting edges for wear before each use and replace when point geometry is degraded to avoid oversized or out-of-round holes.