Chicago-latrobe 44977 Cobalt Jobber Drill Bit Wire 7

Product Description

The CHICAGO-LATROBE 44977 is a cobalt steel jobber-length drill bit designed for demanding metal drilling applications, including titanium and other hard or abrasive materials. Built to Series 550TA standards, it carries a TiAlN coating that reduces heat buildup and extends tool life under high-load cutting conditions. The bit uses a 135-degree split point for fast, self-centering starts without a center punch. It measures 3.625 inches overall with a 2.4375-inch flute length and a straight-cylindrical shank diameter of 0.2010 inches. Material grade M42 cobalt provides superior hot hardness compared to standard HSS tooling. Licensed HVAC techs, machinists, and sheet metal workers reach for this bit when drilling stainless, titanium, or heat-treated alloys.

The 44977 is sized to wire gauge 7, which equals 0.2010 inches in decimal. This makes it a common choice for tap-drill and clearance-hole work in tight-tolerance assemblies. The right-hand, regular-spiral flute geometry evacuates chips efficiently in deep-hole drilling. The web-thinned, tapered web construction reduces thrust requirements and improves penetration in hard materials. Typical applications include fabrication shops, HVAC equipment manufacturing, and field service drilling into structural steel, titanium brackets, and hardened fastener stock. This bit ships as a single unit with no minimum multi-piece commitment required.

Key Features

• M42 cobalt steel construction for superior hot hardness and wear resistance in hard metals
• TiAlN coating reduces friction and extends service life in titanium and stainless drilling
• 135-degree split point self-centers on contact, eliminating the need for a center punch in most setups
• Web-thinned, tapered web reduces axial thrust and improves chip clearance
• Right-hand, regular spiral flute with 2.4375-inch flute length handles deep-hole applications
• Complies with DIN 338 and NAS 907 Type J standards for consistent dimensional tolerances

Compatibility

Designed as a direct-fit replacement or standard-use cobalt jobber bit for any drill press, hand drill, or CNC machining center accepting a 0.2010-inch straight-cylindrical shank. Primary workpiece material is titanium per NAS 907 specification; also suited for stainless steel, hardened alloys, and other hard metals that exceed standard HSS capability.

Installation Notes

A licensed machinist or qualified tradesperson should confirm chuck compatibility and proper shank seating before operation. Secure the workpiece firmly before drilling to prevent walking or chatter. Use appropriate cutting fluid or coolant when drilling hard alloys, even though this bit does not have a coolant-through design, to manage heat at the cutting edge. Follow shop safety protocols and applicable OSHA machine-guarding requirements when operating drill presses or handheld drilling equipment.