Kennametal 4150274 Screw Machine Drill Bit 3/8 in Carbide

Product Description

The KENNAMETAL 4150274 is a solid carbide screw machine length drill bit designed for high-speed, high-precision drilling in metalworking applications. Built to DIN 6537K standards, it features a 3/8 inch (0.3750 inch decimal) cutting diameter with a 140-degree point angle for aggressive, self-centering entry into ferrous and non-ferrous materials. The TiAlN multilayer coating at the tip extends tool life in demanding cutting conditions. With an overall length of 3.504 inches (89.00 mm) and a flute length of 1.850 inches (47.00 mm), this stub-length geometry provides rigidity and reduced deflection in short-reach setups. Machinists and toolroom technicians install this bit in CNC machining centers, drill presses, and manual machines requiring a compact, high-performance carbide drill.

The 4150274 suits production drilling environments where tool stability and hole quality are critical. Its stub-length profile makes it well suited for fixture work, close-tolerance bores, and applications where overhang must be minimized. The right-hand, regular spiral flute geometry promotes efficient chip evacuation in through-hole and blind-hole operations. This bit is appropriate for machining steel, cast iron, aluminum, and similar materials encountered in industrial manufacturing, fabrication shops, and precision machine shops. The straight cylindrical shank with a diameter of 0.3937 inch (10.00 mm) fits standard ER collets and drill chucks without adaptation.

Key Features

• Solid carbide construction for rigidity and heat resistance in high-feed drilling
• TiAlN multilayer coating at the tip for extended wear life in abrasive and ferrous materials
• 140-degree point angle for fast engagement and reduced thrust force on entry
• DIN 6537K specification for consistent dimensional conformance
• Stub-length geometry minimizes deflection in tight-clearance and fixtureed setups
• Tapered web configuration for improved core strength and chip flow balance

Compatibility

Designed as an OEM-style precision drill for use in standard ER collet chucks, keyless drill chucks, and hydraulic toolholders accepting a 0.3937 inch straight cylindrical shank. Part of the KENNAMETAL Series B041A-CPG solid carbide stub drill family.

Installation Notes

Installation should be performed by a qualified machinist following the machine tool manufacturer guidelines for toolholder runout and clamping torque. Ensure the machine spindle is fully stopped and locked out before changing tooling. Verify collet or chuck bore matches the 0.3937 inch shank diameter to prevent slippage during cutting. Coolant-through operation is not supported on this drill; external coolant or mist lubrication should be directed at the cutting zone where process conditions require it.