Kennametal 4148939 Carbide Drill Bit 6mm 140 Deg

Product Description

The KENNAMETAL 4148939 is a screw machine length (stub-length) drill bit engineered for high-performance drilling in demanding production environments. Built from solid carbide and finished with a multilayer TiAlN coating at the tip, this bit delivers the hardness and heat resistance required for cutting ferrous metals, stainless steel, cast iron, and similar materials. The 140-degree split point reduces thrust and improves centering without a pilot hole. At 66.00 mm overall length and a 6.00 mm diameter, it fits standard 6.00 mm whistle notch shank toolholders. Installation and use are performed by machinists and tool-and-die professionals operating CNC machining centers, drill presses, and screw machines.

This drill bit is suited for stub-length drilling applications where rigidity and minimal deflection are priorities. The compact flute length of 28.00 mm and a maximum drilling depth of 20.00 mm make it well-matched for through-hole and shallow blind-hole work in precision machining cells. Coolant-through capability allows internal coolant delivery directly to the cutting edge, extending tool life and evacuating chips efficiently at higher feed rates. The regular spiral flute geometry supports consistent chip evacuation in a wide range of workpiece materials.

Key Features

• Solid carbide construction provides rigidity and wear resistance in hard and abrasive materials
• Multilayer TiAlN tip coating increases surface hardness and thermal stability at the cutting edge
• 140-degree standard point angle reduces entry thrust and self-centers on flat and curved surfaces
• Coolant-through design delivers cutting fluid directly to the drill tip for improved chip removal and heat management
• Whistle notch shank ensures positive drive and secure seating in compatible toolholders
• Tapered web configuration adds core strength and resists drill body deflection during deep cuts

Compatibility

Designed for use with toolholders and chucks accepting a 6.00 mm whistle notch shank. Part of KENNAMETAL Series B051F-CPG, conforming to DIN 6537K specification. Fits drill bit size range of 5.00 to 6.50 mm compatible tooling systems.

Installation Notes

This drill bit is installed and serviced by machinists working on CNC machining centers, manual drill presses, or screw machines. Power down and lock out the spindle before changing tooling. Verify that the toolholder bore and whistle notch orientation are clean and free of chips before seating the shank. When coolant-through capability is used, confirm that the machine spindle coolant circuit is compatible and that coolant pressure is set per machine manufacturer guidelines, not the drill bit specifications.