Kennametal 7070704 Micro Drill Bit 1.90 Mm Solid Carbide 139 Deg

Product Description

The KENNAMETAL 7070704 is a solid carbide micro drill bit designed for high-precision small-diameter drilling applications. It carries a 1.90 mm (0.0748 inches) cutting diameter and features a 139-degree drill point angle optimized for fast penetration with reduced thrust. The multi-layer coating stack — TiAlCrN, TiAlCrSiN, and TiSiN — provides thermal resistance and extended tool life in demanding materials. Coolant-through capability delivers cutting fluid directly to the cutting edge, controlling heat and evacuating chips efficiently. This drill is part of the Kennametal Kendrill series, built for production environments where precision and tool longevity are critical requirements.

This micro drill bit is suited for precision machining operations in aerospace, medical device, automotive, and general metalworking applications where tight-tolerance small-diameter holes are required. The 7xD flute-to-diameter ratio and spiral flute geometry support deep-hole drilling up to 64.30 mm in a single operation. The straight-cylindrical shank with a 4.00 mm diameter is compatible with standard collet chucks and precision toolholders used in CNC machining centers and drill presses. It is typically installed and operated by machinists and CNC tooling technicians.

Key Features

• 1.90 mm (0.0748 inches) cutting diameter for micro and small-diameter precision hole-making
• Triple-layer TiAlCrN, TiAlCrSiN, and TiSiN coating for heat resistance and extended wear life
• 139-degree drill point angle reduces thrust force and improves entry accuracy
• Coolant-through design delivers fluid directly to the cutting zone for chip evacuation and thermal control
• 7xD flute-to-diameter ratio supports deep drilling up to 64.30 mm without pecking
• Solid carbide construction provides rigidity and dimensional stability in hard and abrasive materials

Compatibility

Designed as an OEM-style precision tooling component for use in CNC machining centers, drill presses, and multi-axis machines equipped with standard collet chucks or toolholders accepting a 4.00 mm straight-cylindrical shank.

Installation Notes

Installation should be performed by qualified machinists or CNC tooling technicians. Before tool change, de-energize the spindle and confirm the machine is in a safe stopped state per the equipment manufacturer lockout procedure. Secure the straight-cylindrical shank firmly in a precision collet or toolholder to minimize runout, which is critical at this diameter. Do not exceed the maximum drilling depth of 64.30 mm, and verify coolant-through supply is active before initiating a cut.