Kennametal 2391902 Drill Bit Letter E Solid Carbide Tialn

Product Description

The KENNAMETAL 2391902 is a screw machine length drill bit designed for high-performance drilling in metalworking and machining applications. Built from solid carbide and coated with TiAlN, it delivers extended tool life and heat resistance at elevated cutting speeds. The 140-degree split point reduces walking and thrust force, making it well suited for precision hole-making in ferrous and non-ferrous materials. At 79.00 millimeters overall length with a 34.00-millimeter flute length, this is a compact, stub-style bit intended for use in CNC machining centers, drill presses, and screw machine setups where rigidity and accuracy are critical.

This bit is sized at Letter E, equivalent to 0.2500 inch decimal, and is a direct fit for applications requiring tight-tolerance holes in production or job-shop environments. The straight cylindrical shank at 8.00 millimeters (0.3150 inch decimal) seats securely in standard drill chucks and collet holders. It is typically selected for drilling steel, stainless steel, cast iron, and similar materials where a TiAlN coating provides the thermal barrier needed to maintain cutting edge integrity. The 3xD flute-to-diameter ratio is appropriate for moderate-depth holes without chip evacuation issues.

Key Features

• Solid carbide construction with TiAlN coating for heat resistance and extended tool life
• 140-degree point angle reduces thrust and minimizes drill walk on entry
• Letter E size at 0.2500 inch decimal for consistent, repeatable hole diameter
• Straight cylindrical shank at 8.00 millimeters fits standard chucks and collet holders
• Two-flute regular spiral design promotes chip clearance in through and blind holes
• Screw machine length provides added rigidity compared to jobber-length equivalents

Compatibility

Designed as a screw machine length replacement drill bit in the Kennametal B966 series, material grade KC7315, suitable for use in CNC machining centers, turret lathes, and drill presses accepting a straight cylindrical shank.

Installation Notes

This bit is installed by machinists and CNC operators in standard drill chucks or collet holders sized for the 8.00-millimeter shank. Ensure the machine spindle is fully stopped and locked before changing tooling. Do not exceed the recommended maximum drilling depth of 24.00 millimeters for this bit to avoid chip packing and tool breakage. Verify runout and chuck concentricity before production use to maintain hole tolerance and tool life.