Chicago-latrobe 47783 Cobalt Jobber Drill Bit No. 49

Product Description

The CHICAGO-LATROBE 47783 is a cobalt jobber-length drill bit sized to wire gauge No. 49, with a decimal diameter of 0.0730 inches and an overall length of 2.0000 inches. Built to NAS 907 Type B standards, it features a 135-degree split point that reduces walking on entry and lowers thrust requirements compared to a conventional 118-degree point. The two-flute spiral design with a gold finish and tapered web construction suits high-performance drilling applications in hard and abrasive materials. This bit is installed by machinists, maintenance technicians, and trade professionals working with tight-tolerance bore requirements.

The 47783 is engineered for drilling titanium and similarly hard workpiece materials where standard HSS bits lose cutting edge integrity prematurely. Its straight-cylindrical shank measures 0.0730 inches in diameter, compatible with standard drill chucks. With a flute length of 1.0000 inch and a shank length of 1.0000 inch, it fits compact drilling setups where a short-length bit is not practical but a full jobber reach is still manageable. Series 550ASP designates Chicago-Latrobe's heavy-duty cobalt line built for demanding production and maintenance environments.

Key Features

• Cobalt steel construction for heat resistance and extended tool life in hard-material drilling
• 135-degree split point reduces center walking and cutting thrust on entry
• Gold finish serves as a wear indicator and provides light lubricity
• Tapered web configuration maintains bit rigidity across the flute length
• NAS 907 Type B compliant for applications requiring specification traceability
• Right-hand cut, regular spiral, two-flute design for efficient chip evacuation

Compatibility

Designed for use in standard drill chucks accepting a 0.0730-inch straight-cylindrical shank. Rated for drilling titanium and other hard workpiece materials as an OEM-style high-performance jobber bit in the Chicago-Latrobe Series 550ASP line.

Installation Notes

This bit is installed by machinists and maintenance technicians using a drill press, CNC machine, or hand drill with an appropriate chuck capacity. Secure the shank fully in the chuck before operation and confirm runout is within tolerance to prevent premature bit breakage at this small diameter. Use appropriate cutting fluid or lubricant when drilling titanium or hardened materials to manage heat buildup. Replace the bit when the gold finish is worn through at the cutting edges, as this indicates the cobalt substrate is approaching its wear limit.