Kennametal 4150233 Letter F Solid Carbide Stub Drill Bit

Product Description

The KENNAMETAL 4150233 is a screw machine length (stub) solid carbide drill bit in Letter F size (0.2570 inches), designed for high-precision drilling in metalworking and machining applications. Built to DIN 6537K standards, it features a 140-degree split point and a multilayer TiAlN coating with a TiN tip for extended tool life and resistance to heat buildup at the cutting edge. The 3.1102-inch overall length and straight cylindrical shank make it suitable for use in CNC machining centers, drill presses, and screw machine setups where rigidity and hole accuracy are critical. Installation is typically performed by machinists and tool-and-die professionals.

This stub-length drill bit is engineered for close-tolerance drilling in ferrous and non-ferrous metals, including steel, cast iron, and aluminum alloys. The shortened flute length improves rigidity and reduces deflection, making it well suited for production drilling where repeatability and hole quality matter. The Series B041A-CPG designation identifies it within the KENNAMETAL solid carbide drill program. It is used in precision manufacturing, job shop machining, and high-volume drilling operations where carbide tooling is preferred over high-speed steel.

Key Features

• Letter F size (0.2570 inches) with a diameter tolerance of -0.0006 to 0.0000 inches for close-fit hole making
• 140-degree standard point angle for self-centering and reduced thrust in metal drilling
• Solid carbide construction for superior hardness and wear resistance compared to HSS
• TiAlN multilayer coating with TiN tip extends cutting life and reduces friction
• Stub (screw machine) length at 3.1102 inches overall provides increased rigidity and reduced deflection
• Right-hand cutting, regular spiral flute with tapered web — DIN 6537K specification

Compatibility

Designed as an OEM-style solid carbide stub drill compatible with standard straight-shank drill chucks and collet systems accepting an 8.00 mm (0.3150 inch) shank diameter. Fits within the KENNAMETAL Series B041A-CPG drill program for Letter F diameter applications.

Installation Notes

This bit is installed by machinists using a standard drill chuck or ER collet sized to the 0.3150-inch shank diameter. Ensure the machine spindle is fully powered down and locked out before tool changes. Solid carbide tooling is brittle — avoid side loading, interrupted cuts without proper feed rate adjustments, or dropping the bit on hard surfaces. Verify runout with a dial indicator before production drilling to protect both the tool and the workpiece.