Kennametal 4149257 Solid Carbide Jobber Drill 21/64 Inch

Product Description

The KENNAMETAL 4149257 is a solid carbide jobber-length drill bit engineered for high-performance drilling in demanding metal-cutting applications. It measures 21/64 inch (0.3281 inch) in diameter with a 140-degree split-point geometry and a multilayer TiAlN coating for heat resistance and extended tool life. The overall length is 4.0551 inches (103.00 mm) with a flute length of 2.4016 inches (61.00 mm). The straight cylindrical shank measures 0.3438 inch in diameter and 1.5748 inches in length. A right-hand, regular spiral flute design provides efficient chip evacuation. Coolant-through capability makes this drill suitable for deep-hole work and high-speed production environments. Licensed machinists, toolroom operators, and CNC operators typically specify this drill.

This jobber drill is suited for drilling steel, stainless steel, cast iron, aluminum, and other non-ferrous materials in both production and job-shop settings. The 5xD flute-to-diameter ratio and tapered web configuration support stability in through-hole and blind-hole operations. It conforms to DIN 6537K specification, making it compatible with standard tool holders and drill chucks that accept straight-cylindrical shanks in the 0.3438-inch shank diameter range. It is appropriate for CNC machining centers, drill presses, and manual milling machines where a precision carbide drill is required.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous and non-ferrous materials
• Multilayer TiAlN coating provides thermal protection and reduces built-up edge at elevated cutting speeds
• 140-degree point angle reduces thrust force and improves self-centering on entry
• Coolant-through design supports deep-hole drilling and chip flushing in production applications
• Right-hand, regular spiral flute with tapered web for consistent chip evacuation
• Conforms to DIN 6537K for dimensional interchangeability with standard tooling systems

Compatibility

Designed for use in standard straight-shank drill chucks and collet-style tool holders accepting a 0.3438-inch shank diameter. Compatible workpiece materials listed in the specification include steel, stainless steel, cast iron, aluminum, and non-ferrous alloys.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or CNC operators familiar with carbide tooling. Ensure the machine spindle and tool holder are clean and properly torqued before securing the shank. Carbide tooling is brittle and should never be used in worn or loose chucks that allow runout. Verify coolant-through pressure and flow rate are within the machine and tooling specifications before starting a cut.