Chicago-latrobe 46771 Cobalt Jobber Drill Bit 0.234 in

Product Description

The CHICAGO-LATROBE 46771 is a cobalt jobber length drill bit designed for high-performance drilling in hard and abrasive materials. Built from M42 cobalt high-speed steel with a gold oxide coating, it delivers superior heat resistance and edge retention compared to standard HSS tooling. The 135-degree split point reduces walking and allows drilling to begin without a center punch on most materials. With an overall length of 3-7/8 inches and a flute length of 2-5/8 inches, this bit suits standard jobber-length applications across machine shop, maintenance, and trade fabrication environments. Licensed machinists, pipefitters, and industrial maintenance technicians are the primary users.

The 46771 is engineered for drilling titanium and other tough alloys as its primary workpiece material, making it a go-to choice in aerospace, industrial, and heavy mechanical fabrication settings. The 0.234-inch diameter straight-cylindrical shank seats directly into standard drill chucks and collet holders without adaptation. The regular spiral flute geometry and tapered web with web thinning promote efficient chip evacuation in deep-hole applications. This bit meets DIN 338 and NAS 907 Type J standards, confirming its suitability for precision and specification-controlled work environments.

Key Features

• M42 cobalt steel construction provides extended tool life in titanium, stainless, and high-alloy steels
• Gold oxide coating reduces friction and enhances heat resistance during aggressive cuts
• 135-degree split point minimizes drill walk and reduces required feed pressure
• Web-thinned tapered web improves chip flow and lowers cutting torque
• Right-hand cut, 2-flute spiral design supports standard CW rotation drilling setups
• Meets DIN 338 and NAS 907 Type J standards for precision-controlled applications

Compatibility

The 46771 is a Series 550 jobber length drill bit with a 0.234-inch straight-cylindrical shank compatible with standard drill chucks and collet systems accepting that shank diameter. It falls within the 0.2000 to 0.2500 inch drill bit size range and is intended for use with drill presses, CNC drilling machines, and hand-held power drills in industrial and trade applications.

Installation Notes

Installation is performed by machinists, tool and die technicians, or qualified maintenance personnel familiar with rotary cutting tools. Ensure the drill chuck or collet is clean and fully seated before tightening to prevent runout. Power down the drill press or disconnect the tool from its power source before changing bits. Do not exceed the recommended feed and speed parameters for the workpiece material, as cobalt bits are resistant to heat but not immune to fracture under excessive side load.