Kennametal 4150246 Screw Machine Drill Bit 7.50mm Carbide

Product Description

The KENNAMETAL 4150246 is a solid carbide screw machine length (stub) drill bit designed for precise, high-performance drilling in metal and hard-material applications. Built to DIN 6537K standards, it features a 140-degree split point for reduced thrust and accurate positioning without center punching. The multilayer TiAlN coating on the tip extends tool life in demanding production environments. At 79 millimeters overall length with a 7.50 mm cutting diameter, this right-hand spiral flute bit is sized for CNC machining centers, drill presses, and automated screw machine operations where stub-length rigidity and hole accuracy are critical.

This drill bit is suited for high-volume production drilling in ferrous and non-ferrous metals, cast iron, and similar hard materials. The stub length and straight cylindrical shank make it a practical choice for close-tolerance work in machining cells where minimizing deflection and maintaining positional accuracy are priorities. It is installed and operated by machinists, tool and die technicians, and CNC setup professionals working in job shops and production manufacturing environments.

Key Features

• 7.50 mm cutting diameter with a tolerance of -0.015 to 0.000 mm for close-tolerance hole sizing
• 140-degree standard point angle reduces entry thrust and improves self-centering
• Solid carbide construction provides rigidity and wear resistance over high cycle counts
• TiAlN tip coating extends cutting life in abrasive and heat-intensive applications
• Stub (screw machine) length with 3xD flute-to-diameter ratio maximizes rigidity and minimizes deflection
• Straight cylindrical 8.00 mm shank fits standard drill chucks and toolholders without special adapters
• Complies with DIN 6537K specification for dimensional and geometric consistency

Compatibility

Designed as an OEM-style replacement or direct tooling selection within the KENNAMETAL B041A-CPG series, suitable for drill presses, CNC machining centers, and screw machines accepting a straight cylindrical shank of 8.00 mm diameter.

Installation Notes

Installation is performed by a qualified machinist or CNC technician. Always power down and lock out the machine spindle before inserting or removing the bit from the toolholder or chuck. Ensure the shank is fully seated and the chuck or collet is properly torqued to the machine manufacturer's specification before operation. Solid carbide tooling is brittle — avoid side loading, interrupted cuts without appropriate feed rate adjustment, and contact with hard fixtures during setup.