Kennametal 4149253 Carbide Jobber Drill Bit 8 Mm

Product Description

The KENNAMETAL 4149253 is a solid carbide jobber-length drill bit designed for precision hole-making in demanding production environments. The 8 mm diameter bit features a multilayer TiAlN (titanium aluminum nitride) coating that extends tool life in high-temperature cutting applications. A 140-degree point angle reduces thrust and improves centering on entry. With an overall length of 91 mm and a flute length of 53 mm, the bit fits standard drill chucks and machining center toolholders. Internal coolant-through capability supports high-speed, deep-hole operations in ferrous and non-ferrous materials. This bit is built to DIN 6537K specification and is sold individually.

This drill bit is suited for CNC machining centers, drill presses, and manual machine tools in metalworking shops, tool rooms, and production environments. The 5xD flute-to-diameter ratio and 43 mm maximum drilling depth make it appropriate for through-holes and blind holes in steel, cast iron, aluminum, and similar alloys. It is typically installed by machinists, toolroom technicians, and CNC operators working to close-tolerance print requirements.

Key Features

• Solid carbide construction for rigidity and wear resistance in hard and abrasive materials
• Multilayer TiAlN coating increases surface hardness and thermal resistance at the cutting edge
• 140-degree standard point angle improves self-centering and reduces walking on entry
• Coolant-through design supports high-speed cutting and chip evacuation in deep-hole applications
• Two-flute spiral configuration with tapered web for efficient chip removal
• Straight-cylindrical 8 mm shank compatible with standard collet chucks and drill chucks
• Manufactured to DIN 6537K specification for consistent dimensional accuracy

Compatibility

Designed as an OEM-style replacement or production-grade option for standard 8 mm straight-shank drill bit applications conforming to DIN 6537K.

Installation Notes

Installation and use should be performed by qualified machinists or CNC operators. Secure the shank in a properly sized collet or drill chuck and verify runout before cutting. Ensure the machine spindle is stopped and power is isolated before inserting or removing the bit. When using coolant-through capability, confirm that the toolholder and spindle support through-coolant flow before pressurizing the system.