Chicago-latrobe 45713 Jobber Drill Bit No. 43 Hss

Product Description

The CHICAGO-LATROBE 45713 is a jobber-length drill bit from the Series 150ASP, designed for high-performance drilling in demanding trade and industrial applications. It carries a wire gauge size of No. 43, equivalent to 0.0890 inches in decimal. The bit is manufactured from heavy-duty high speed steel with an oxide coating for added surface protection. A 135-degree split point reduces walking on entry and lowers thrust requirements. The overall length is 2.25 inches, with a 1.25-inch spiral flute and a straight-cylindrical shank measuring 1.0 inch in length. Right-hand cut with a regular spiral and a tapered, web-thinned configuration completes the geometry. Licensed machinists, maintenance technicians, and metal fabricators are the primary users.

This bit is suited for drilling cast iron, stainless steel, and carbon steel in production and maintenance environments. The No. 43 size is commonly used for tapping clearance holes and precision fit applications in light industrial and mechanical assembly work. The NAS 907 Type B specification positions it for aerospace-adjacent and precision metalworking tasks where dimensional tolerance is critical. The oxide finish provides mild lubricity and corrosion resistance during operation. It fits standard drill chucks accepting a 0.0890-inch straight-cylindrical shank.

Key Features

• No. 43 wire gauge size, 0.0890 inches decimal diameter, within the 0.0500 to 0.1000 inch size range
• 135-degree split point reduces walking and entry thrust on hard metals
• Heavy-duty high speed steel construction with oxide coating
• Web-thinned, tapered web configuration for improved chip evacuation
• Right-hand cut, regular spiral, 2-flute design for consistent chip removal
• Meets NAS 907 Type B specification for precision metalworking applications

Compatibility

Designed for use in primary workpiece materials including cast iron, stainless steel, and carbon steel. Fits standard drill chucks accepting a straight-cylindrical shank of 0.0890 inches. Coolant-through drilling is not supported with this bit.

Installation Notes

This bit is intended for use by machinists and mechanical technicians using standard bench-top or portable drilling equipment. Secure the workpiece firmly before drilling to prevent movement on entry. Use appropriate cutting fluid or lubricant when drilling stainless steel to reduce heat buildup and extend bit life. Inspect the split point for wear regularly, as high speed steel bits used in stainless steel or cast iron can dull faster under high feed rates or dry conditions.