Kennametal 4151740 Taper Length Drill Bit 1.9mm Carbide

Product Description

The KENNAMETAL 4151740 is a taper length twist drill bit from the B053A-CPG series, designed for precision drilling in demanding metal cutting applications. Built from solid carbide grade KC7325 and coated with a multilayer TiAlN finish, this bit delivers high heat resistance and extended tool life in ferrous and non-ferrous materials. The 140-degree split point reduces thrust forces and improves centering accuracy without a pilot hole. At 1.9 mm in diameter with an 8xD flute-to-diameter ratio, it is sized for fine-bore work where dimensional accuracy is critical. Licensed machinists, tool and die professionals, and CNC operators are the primary users of this bit.

This drill bit fits production machining environments where small-diameter, deep-relative-to-diameter holes are required. The straight cylindrical shank measures 4.0 mm in diameter and 28.0 mm in length, making it compatible with standard collet chuck systems and precision drill chucks. With a maximum drilling depth of 15.0 mm and a flute length of 18.0 mm, it is suited for through-hole and blind-hole operations in workpieces requiring tight tolerances. Coolant-through capability supports high-speed drilling cycles in automated machining centers and CNC drilling applications where chip evacuation and thermal management are essential.

Key Features

• Solid carbide KC7325 grade construction for high rigidity and wear resistance
• Multilayer TiAlN coating for elevated heat resistance and extended tool life
• 140-degree standard point angle for reduced entry thrust and accurate self-centering
• Coolant-through design supports high-speed drilling and chip evacuation
• 8xD flute-to-diameter ratio enables controlled chip flow in deep-relative-to-diameter holes
• Tapered web configuration for improved core strength at small diameters
• Conforms to DIN 6537K specification for consistent dimensional standards

Compatibility

Designed as an OEM-style replacement or direct-application drill for CNC machining centers and precision drill presses equipped with collet chuck systems accepting a 4.0 mm straight cylindrical shank.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or CNC operators familiar with small-diameter carbide tooling. Carbide is brittle - avoid side loading, interrupted cuts, or sudden feed changes that can cause chipping or fracture. Ensure the workpiece and spindle are rigidly secured before initiating a drilling cycle. Verify coolant flow is active before engaging the cut when using coolant-through capability.