Kennametal 4150278 Screw Machine Drill Bit 9.90mm Carbide

Product Description

The KENNAMETAL 4150278 is a screw machine length (stub) drill bit engineered for precision drilling in metal and hard material applications. Built from solid carbide with a multilayer TiAlN coating at the tip, this bit delivers high wear resistance and thermal stability under demanding cutting conditions. The 140-degree split point reduces walking and thrust load at entry. With an overall length of 3.504 inches and a cutting diameter of 9.90 mm (0.3898 inches), it is sized for short-reach, high-accuracy work on CNC machining centers, drill presses, and screw machines. Licensed machinists, tool-and-die technicians, and CNC operators are the typical end users.

This drill bit is designed for stub-length drilling applications where rigidity and hole accuracy are critical. The straight cylindrical shank, 10.00 mm in diameter, seats directly in standard collets or drill chucks without adapters. The regular spiral flute geometry with a 3xD flute-to-diameter ratio produces efficient chip evacuation at depths up to 1.378 inches (35.00 mm). It is suited for production environments requiring consistent, repeatable hole geometry in ferrous and non-ferrous metals. The B041A-CPG series conforms to DIN 6537K specification, making it a recognized standard for stub drill geometry in industrial machining.

Key Features

• Solid carbide construction provides rigidity and resistance to deflection in short-reach drilling
• Multilayer TiAlN tip coating extends tool life in high-temperature cutting applications
• 140-degree standard point angle reduces entry thrust and minimizes workpiece distortion
• Right-hand, regular spiral flute design promotes consistent chip evacuation
• Straight cylindrical shank at 10.00 mm diameter fits standard collets and drill chucks
• Conforms to DIN 6537K specification for stub drill geometry

Compatibility

Designed for use in CNC machining centers, manual drill presses, and screw machines accepting a 10.00 mm straight shank. Fits within the 9.50 mm to 11.00 mm drill bit size range category per DIN 6537K stub drill standards.

Installation Notes

This bit should be installed by a qualified machinist or CNC operator following standard tooling setup procedures. Ensure the machine spindle is fully powered down and locked out before changing tooling. Seat the shank fully and evenly in the collet or chuck to the recommended grip depth to prevent runout. Do not exceed the maximum drilling depth of 1.378 inches without retracting to clear chips.