Kennametal 4149191 Solid Carbide Jobber Drill 3.90 Mm

Product Description

The KENNAMETAL 4149191 is a solid carbide jobber-length drill bit designed for high-performance drilling in metalworking applications. It measures 3.90 mm in diameter with an overall length of 74.00 mm and a flute length of 36.00 mm. The 140-degree split point reduces thrust and improves self-centering on entry. A TiAlN coating extends tool life in abrasive and heat-intensive cuts. Coolant-through capability delivers fluid directly to the cutting zone, supporting higher feed rates and longer runs without excessive heat buildup. This bit is sized at a 5xD flute-to-diameter ratio and features a tapered web configuration for added rigidity at the core.

This drill is suited for precision metalworking in production and maintenance environments. It is intended for use in CNC machining centers, drill presses, and other rigid setups where consistent hole quality is required. Primary workpiece materials include steel, stainless steel, cast iron, aluminum, and other non-ferrous metals. The straight cylindrical shank accepts standard collet chucks and drill chucks without adapters. It is typically installed and operated by machinists, tool-and-die professionals, and industrial maintenance technicians working in fabrication or production settings.

Key Features

• Solid carbide construction for rigidity and wear resistance in hard materials
• TiAlN coating reduces heat absorption and extends cutting tool life
• 140-degree point angle improves self-centering and reduces entry thrust
• Coolant-through design delivers fluid directly to the cutting edge
• Right-hand, regular spiral flute with tapered web for core strength
• 5xD flute-by-diameter ratio supports deeper drilling with chip clearance

Compatibility

Designed as a high-performance OEM-style jobber drill for use in rigid CNC and manual drilling setups where straight-shank tooling in the 3.90 mm diameter range is required. Compatible workpiece materials include steel, stainless steel, cast iron, aluminum, and non-ferrous alloys as specified by the manufacturer.

Installation Notes

Installation and operation should be performed by qualified machinists familiar with carbide tooling. Secure the straight cylindrical shank firmly in a properly sized collet or drill chuck before operation, and verify runout is within acceptable limits for the application. Carbide is brittle compared to high-speed steel - avoid lateral loading, interrupted cuts without proper setup, or hand-held drilling operations. Ensure coolant supply lines are functioning and delivering adequate flow to the through-coolant ports before beginning any extended drilling cycle.