Chicago-latrobe 46719 Cobalt Jobber Drill Bit No 49

Product Description

The CHICAGO-LATROBE 46719 is a cobalt jobber length drill bit designed for high-performance drilling in hard and abrasive materials. Built to Series 550 specifications, it carries a No. 49 wire gauge size corresponding to 0.0730 inches in diameter, with a 135-degree split point for accurate starting and reduced thrust. The gold oxide coating improves lubricity and heat resistance during extended cutting cycles. At 2 inches overall length with a 1-inch spiral flute, this bit suits precision drilling in tight workspaces. The M42 cobalt steel construction meets DIN 338 and NAS 907 Type J standards, making it a recognized choice for aerospace and industrial drilling applications.

This drill bit is intended for use on titanium, stainless steel, high-nickel alloys, and other tough workpiece materials that generate high cutting temperatures. The right-hand spiral flute with regular helix and web-thinned, tapered web geometry promotes efficient chip evacuation and reduces walking on entry. It is commonly used in production and MRO environments by machinists, aerospace maintenance technicians, and trade professionals requiring repeatable accuracy in small-diameter drilling operations. The straight-cylindrical shank fits standard drill chucks and collet holders without modification.

Key Features

• No. 49 wire size, 0.0730 inches diameter with diameter tolerance of -0.0005 to 0.0000 inches
• M42 cobalt steel construction rated for heavy-duty drilling in titanium and hard alloys
• 135-degree split point reduces walking and lowers required feed pressure
• Gold oxide coating improves surface lubricity and extends tool life in high-heat cuts
• Web-thinned tapered web with 2-flute regular spiral for clean chip evacuation
• Meets DIN 338 and NAS 907 Type J standards for aerospace and industrial use

Compatibility

Designed as an OEM-style replacement and standard production drill bit suitable for use in any drill press, hand drill, or CNC machine tool equipped with a chuck or collet accepting a 0.0730-inch straight-cylindrical shank.

Installation Notes

This bit should be installed and operated by machinists or qualified trade technicians familiar with small-diameter drilling procedures. Secure the shank fully in the chuck or collet before operation and verify runout before beginning a production run. Use appropriate cutting fluid or coolant compatible with the workpiece material to manage heat buildup, as cobalt bits in this diameter range are susceptible to breakage under side load or excessive feed pressure. Always wear appropriate eye protection and follow applicable shop safety standards.