Kennametal 4151786 Micro Drill Bit 1.40mm Carbide Tialn

Product Description

The KENNAMETAL 4151786 is a solid carbide micro drill bit designed for precision small-diameter drilling in demanding industrial and machining applications. Measuring 1.40 mm (0.0550 inches) in diameter with a 140-degree drill point angle, this bit delivers accurate entry geometry suited for hard and abrasive workpiece materials. The TiAlN coating extends tool life by improving heat and wear resistance at elevated cutting speeds. With an overall length of 58.00 mm (2.2835 inches) and a straight-cylindrical shank, this drill bit is compatible with standard CNC machining centers and precision drill presses. It is manufactured to DIN 6537K specification, ensuring consistent dimensional accuracy for production environments.

This micro drill bit is intended for use in precision machining operations where tight hole tolerances and fine diameters are required. Typical applications include component drilling in aerospace, medical device manufacturing, electronics, and general metalworking. The right-hand cutting direction and spiral flute design facilitate reliable chip evacuation in ferrous and non-ferrous materials. The tapered web configuration adds core strength, reducing the risk of bit deflection or breakage at small diameters. Licensed machinists and CNC programmers working in production or job-shop environments will find this bit appropriate for controlled, repeatable drilling cycles.

Key Features

• 1.40 mm (0.0550 inch) diameter precision ground to DIN 6537K specification with a tolerance of -0.014 to 0.000 mm
• TiAlN coating improves heat resistance and extends tool life in high-speed cutting applications
• 140-degree standard point angle for controlled entry and reduced thrust force
• Solid carbide construction provides rigidity and wear resistance in hard materials
• Tapered web and spiral flute design support chip evacuation and bit stability at micro diameters
• Straight-cylindrical shank (4.00 mm diameter) fits standard collet and drill chuck toolholders

Compatibility

Designed as an OEM-style precision drill bit in the KENNAMETAL B042A-CPG series, conforming to DIN 6537K standards for solid carbide drill bits with straight-cylindrical shanks.

Installation Notes

Installation and use should be performed by qualified machinists or CNC technicians. Ensure the machine spindle and toolholder are fully powered down and locked out before loading or removing the bit. Use a properly sized collet or precision drill chuck matched to the 4.00 mm shank diameter to prevent runout. Do not exceed the maximum drilling depth of 6.00 mm per the tool specification, and apply appropriate cutting speeds and feeds for the workpiece material to avoid premature tool failure.