Kennametal 4151739 Taper Length Drill Bit 1.8 Mm Carbide

Product Description

The KENNAMETAL 4151739 is a solid carbide taper length drill bit in the B053A-CPG series, designed for precision drilling in demanding metalworking and machining applications. Built from KC7325-grade solid carbide with a multilayer TiAlN coating, the bit delivers high thermal resistance and extended tool life in abrasive and high-temperature cutting conditions. It measures 1.8 mm (0.0709 inches) in diameter with a 140-degree point angle and a spiral flute configuration that promotes efficient chip evacuation. Coolant-through capability supports deep-hole drilling while managing heat at the cutting zone. This bit is installed and operated by machinists, tool-and-die makers, and precision drilling technicians.

The 4151739 is suited for taper length drilling operations in materials requiring tight hole tolerances, including hardened steels, cast iron, stainless alloys, and similar workpiece materials. The 8xD flute-length-to-diameter ratio and straight cylindrical shank make it compatible with standard collet chucks and precision tool holders. With a maximum drilling depth of 15 mm (0.5906 inches) and a flute length of 18 mm (0.7087 inches), it fits compact CNC machining centers and drill presses requiring small-diameter through-hole capability. The tapered web configuration per DIN 6537K provides additional rigidity for consistent entry and exit geometry.

Key Features

• Solid carbide KC7325 grade construction for wear resistance in hard and abrasive materials
• Multilayer TiAlN coating for elevated thermal resistance and extended cutting life
• 140-degree standard point angle for reduced thrust and accurate hole entry
• Coolant-through design supports deep-hole drilling and chip flushing
• Straight cylindrical shank at 4 mm (0.1575 inches) for secure collet or chuck retention
• Tapered web per DIN 6537K standard for consistent rigidity and geometry

Compatibility

Designed as an OEM-style replacement and standard tooling option within the KENNAMETAL B053A-CPG series for precision small-diameter drilling applications requiring straight cylindrical shank interface.

Installation Notes

Installation and operation should be performed by qualified machinists or tooling technicians familiar with CNC or manual drilling equipment. Confirm the spindle and tool holder are fully powered down and locked out before changing tooling. Verify collet size matches the 4 mm shank diameter before seating the bit. Do not exceed the rated maximum drilling depth of 15 mm without re-evaluating chip evacuation and coolant delivery.