Chicago-latrobe 43627 27/64 Inch Drill Bit Ticn Hss

Product Description

The CHICAGO-LATROBE 43627 is a jobber-length twist drill bit designed for heavy-duty metal drilling in professional trade and industrial machining applications. Built from M7 high speed steel and finished with a TiCN (titanium carbonitride) coating, this bit delivers extended tool life and heat resistance compared to uncoated HSS tooling. The 135-degree split point reduces walking on hard surfaces and requires less feed pressure at entry. With a 27/64-inch diameter (0.4200 inches decimal) and a 5-3/8-inch overall length, this bit fits standard jobber-length drill chucks and is sized for production or service-bay use where precision hole sizing matters.

This drill bit is suited for cutting cast iron, stainless steel, and carbon steel in both shop and field settings. The right-hand spiral flute design evacuates chips efficiently during through-hole and blind-hole drilling. The straight cylindrical shank accepts standard three-jaw chucks on drill presses, hand drills, and CNC drilling equipment. Machinists, pipefitters, ironworkers, and HVAC and plumbing fabricators working with heavy-gauge ferrous material will find this bit appropriate for day-to-day production drilling tasks where a consistent, tight-tolerance hole is required.

Key Features

• M7 high speed steel construction rated for heavy-duty ferrous and stainless drilling
• TiCN coating increases surface hardness and reduces friction for longer tool life
• 135-degree split point reduces bit walk and lowers required feed pressure at startup
• Web-thinned, tapered web design improves chip clearance and cutting efficiency
• Right-hand cut with regular spiral flute for reliable chip evacuation
• Meets NAS 907 Type B specification for dimensional and performance consistency

Compatibility

Designed for use with standard straight-shank drill chucks. Primary workpiece materials include cast iron, stainless steel, and steel. Part of the CHICAGO-LATROBE Series 150ASP-TC, sized within the 0.4000 to 0.5000 inch diameter range.

Installation Notes

This bit is installed by machinists, fabricators, and trade professionals using drill presses, hand drills, or CNC drilling equipment with a compatible three-jaw chuck. Before mounting or changing the bit, ensure the machine is powered off and the chuck is fully secured before operation. Apply appropriate cutting fluid when drilling stainless steel or hardened steel to reduce heat buildup and extend bit life. Do not exceed the recommended feed rate for the workpiece material, as overfeeding can cause premature tip failure or bit breakage.