Chicago-latrobe 41611 Jobber Drill Bit 11/64 in Tin Hss

Product Description

The CHICAGO-LATROBE 41611 is a jobber-length twist drill bit engineered for heavy-duty metal-cutting applications. Built from high speed steel with a titanium nitride (TiN) coating, this bit delivers extended tool life and improved wear resistance compared to uncoated HSS. It measures 11/64 inch (0.1719 inch decimal) in diameter with a 3-1/4 inch overall length and a 135-degree split-point tip that reduces walking and lowers thrust requirements on hard materials. The two-flute, right-hand spiral design evacuates chips efficiently, making this bit suitable for production drilling environments. Machinists, maintenance techs, and metal fabricators are the primary users of this tool.

The 41611 is rated for drilling cast iron, stainless steel, and carbon steel. Its web-thinned, tapered-web construction reduces cutting resistance in tough alloys. The straight cylindrical shank seats in standard three-jaw drill chucks on drill presses, hand drills, and CNC machines. The Series 150ASP-TN designation identifies this as a high-performance production bit within the CHICAGO-LATROBE lineup, conforming to NAS 907 Type B standards. It is well suited for repetitive-cycle drilling in fabrication shops, maintenance facilities, and mechanical contractor operations.

Key Features

• TiN coating increases surface hardness and reduces friction for longer tool life in steel and cast iron
• 135-degree split point reduces thrust and eliminates the need for a center punch on flat stock
• Web-thinned tapered web lowers cutting resistance in hard and abrasive materials
• Right-hand spiral flutes provide efficient chip evacuation during through-hole drilling
• NAS 907 Type B compliant for consistent dimensional accuracy and interchangeability
• Diameter tolerance of -0.0007 to 0.0000 inch ensures close-tolerance hole sizing

Compatibility

Designed for use in standard drill chucks accepting straight cylindrical shanks. Suitable for drilling cast iron, stainless steel, and carbon steel per the NAS 907 Type B specification.

Installation Notes

This bit is installed by machinists and metal fabricators in drill press, hand drill, or CNC spindle chucks. Secure the shank fully in the chuck and verify concentricity before drilling to avoid premature coating wear or bit breakage. Use appropriate cutting fluid or coolant when drilling stainless steel or hard alloys to preserve the TiN coating and extend tool life. Inspect the cutting edges for chipping or wear before each use and replace when the split point no longer self-centers.