Chicago-latrobe 47840 Cobalt Jobber Drill 3mm 135 Deg

Product Description

The CHICAGO-LATROBE 47840 is a cobalt jobber-length drill bit designed for high-performance drilling in tough materials. Built to NAS 907 Type B standards, it features a 135-degree split point that reduces walking and allows drilling to start without a center punch in most setups. The straw-colored coating results from the heat treatment process used during manufacturing. At 3.00 mm in diameter with a 61.00 mm overall length and a 33.00 mm flute length, this is a compact, precision drill suited for metalworking professionals who drill into stainless steel and hardened materials on a regular basis.

This drill bit is intended for use on stainless steel and other hardened materials where standard high-speed steel bits lose their edge quickly. Its cobalt construction provides the heat resistance needed for harder alloys. It is well suited for maintenance shops, fabrication environments, and production drilling operations. The right-hand cutting direction, two-flute spiral design, and straight cylindrical shank make it compatible with standard drill chucks and CNC setups alike.

Key Features

• Cobalt construction for superior heat and wear resistance in hard metals
• 135-degree split point reduces thrust and eliminates center-punch requirements
• Web-thinned, tapered web design improves chip evacuation
• NAS 907 Type B specification for heavy-duty, high-performance drilling
• Straight cylindrical shank fits standard 3-jaw drill chucks and collet holders
• Straw finish indicates cobalt heat treatment process

Compatibility

Designed as a heavy-duty jobber drill for use in stainless steel and hardened materials; fits any drill chuck or collet system accepting a 3.00 mm straight shank, consistent with Series 550ASP tooling applications.

Installation Notes

This bit should be installed by a qualified machinist or metalworking professional using appropriate chuck or collet tooling. Secure the shank fully in the chuck before operation and confirm runout is within acceptable tolerance for the application. Use appropriate cutting fluid or coolant when drilling stainless steel to manage heat buildup. Inspect the cutting edges for wear before each use, as cobalt bits used in hardened materials are subject to thermal fatigue if run dry.