Chicago-latrobe 46716 Cobalt Jobber Drill Bit No. 46

Product Description

The CHICAGO-LATROBE 46716 is a Series 550 cobalt jobber-length drill bit sized at wire gauge No. 46 (0.0810 inches decimal equivalent). Manufactured from M42 cobalt high-speed steel and finished with a gold oxide coating, this bit is engineered for heavy-duty drilling in hard and abrasive materials. The 135-degree split point reduces walking on entry and lowers thrust force required to start the hole. Overall length is 2.125 inches with a 1.125-inch flute length. It is suited for professional machinists, maintenance mechanics, and metalworking tradespeople who require consistent performance in demanding production or field environments.

This bit is rated for primary use in titanium and other hard metals where standard high-speed steel tooling falls short. The M42 cobalt alloy composition provides elevated red hardness, making it appropriate for stainless steel, high-nickel alloys, and other work-hardening materials. The tapered web with web-thinning reduces cutting resistance and chip packing in deep holes. Conforming to DIN 338 and NAS 907 Type J standards, the 46716 is a recognized specification-grade tool for aerospace, industrial maintenance, and precision fabrication applications.

Key Features

• M42 cobalt HSS construction for superior hardness and heat resistance in tough materials
• 135-degree split point reduces thrust and eliminates center-punch requirement on most metals
• Gold oxide finish improves lubricity and provides visual wear indicator
• Web-thinned tapered web reduces cutting torque and minimizes chip packing
• Regular spiral flute with right-hand cut in straight-cylindrical shank for standard chuck compatibility
• Meets DIN 338 and NAS 907 Type J specifications for aerospace and industrial use

Compatibility

Designed as an OEM-specification replacement or direct-use jobber-length drill bit for applications requiring a No. 46 wire gauge size in cobalt grade tooling, conforming to NAS 907 Type J and DIN 338 standards.

Installation Notes

Install in a standard keyless or keyed drill chuck capable of holding a 0.0810-inch straight-cylindrical shank. Use appropriate cutting fluid or coolant to maximize tool life when drilling titanium or stainless steel, as dry drilling significantly reduces bit longevity. Ensure the workpiece is securely clamped before drilling to prevent deflection at this small diameter. Inspection and replacement of worn bits should follow shop safety protocols per applicable OSHA or facility guidelines.