Chicago-latrobe 44729 Wire Size 59 Hss Jobber Drill Bit

Product Description

The CHICAGO-LATROBE 44729 is a jobber-length twist drill bit in wire gauge size 59, with a decimal diameter of 0.0410 inches. Made from high-speed steel with an oxide coating, it features a 135-degree split point and a web-thinned, tapered web construction that reduces walking and lowers thrust on entry. The straight-cylindrical shank measures 0.0410 inches in diameter with a shank length of 0.9375 inches. Overall length is 1.625 inches. This bit is designed for high-performance, heavy-duty drilling applications and meets NAS 907 Type B standards. It is typically installed by machinists, maintenance technicians, and trade professionals requiring tight-tolerance small-diameter drilling.

The 44729 is suited for drilling cast iron, stainless steel, and carbon steel in production and maintenance environments. The regular spiral flute and two-flute geometry provide efficient chip evacuation in these demanding workpiece materials. At 0.0410 inches, this wire-gauge bit fits precision drilling tasks where close diameter tolerance is critical. The diameter tolerance is held to -0.0005 to 0.0000 inches, making it appropriate for applications requiring consistent hole sizing without reaming in softer ferrous materials.

Key Features

• Wire gauge size 59, 0.0410-inch decimal diameter with tolerance of -0.0005 to 0.0000 inches
• 135-degree split point with web thinning reduces thrust and improves self-centering
• High-speed steel construction with oxide coating for wear resistance and chip resistance
• Two-flute regular spiral design promotes efficient chip evacuation
• Straight-cylindrical shank for use in standard drill chucks and CNC tool holders
• Meets NAS 907 Type B specification, heavy-duty grade, Series 150ASP

Compatibility

Designed as a direct-fit replacement or standard jobber-length drill bit for use in any drill press, hand drill, or CNC machining center equipped with a chuck or collet that accepts a 0.0410-inch straight-cylindrical shank. Primary workpiece materials include cast iron, stainless steel, and steel as stated by the manufacturer.

Installation Notes

Install in a properly sized chuck or collet and confirm secure seating before operation. Secure the workpiece before drilling to prevent movement, especially when working with stainless steel or cast iron. Use appropriate cutting fluid for stainless steel applications to extend tool life and maintain hole quality. Follow applicable shop safety procedures and machine guarding requirements during operation.