Kennametal 4151741 Taper Length Drill Bit 1.98 Mm

Product Description

The KENNAMETAL 4151741 is a solid carbide taper length drill bit in the B053A-CPG series, designed for precision small-diameter drilling in demanding machining environments. At 1.98 mm in diameter with a 140-degree point angle, it is engineered for accurate entry and minimal walking on hard or abrasive workpiece materials. The multilayer TiAlN coating improves wear resistance and thermal stability at elevated cutting speeds. Coolant-through capability allows internal delivery of cutting fluid directly to the cutting edge, extending tool life and improving chip evacuation in deep-hole applications. This bit is installed and operated by machinists and tooling professionals on CNC drilling and machining centers.

The 4151741 is suited for precision drilling in aerospace, automotive, die-and-mold, and general metalworking applications where tight tolerances and small hole diameters are required. The straight cylindrical shank seats in standard collet or drill chuck toolholding. With a flute-length-to-diameter ratio of 8xD and a maximum drilling depth of 22 mm, it handles moderate-depth holes while maintaining rigidity. The spiral flute geometry and tapered web promote efficient chip flow and reduce thrust force.

Key Features

• Solid carbide construction for rigidity and wear resistance in hard materials
• Multilayer TiAlN coating for elevated thermal resistance and extended tool life
• 140-degree point angle for accurate entry and reduced thrust
• Coolant-through design delivers cutting fluid directly to the cutting zone
• 8xD flute-length-to-diameter ratio supports moderate-depth drilling with minimal deflection
• DIN 6537K specification ensures dimensional consistency and toolholder compatibility

Compatibility

Designed as an OEM-style replacement and production drill for use in CNC machining centers and drill presses equipped with collet or drill chuck toolholding accepting a 4 mm straight cylindrical shank. Conforms to DIN 6537K. Material grade KC7325.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Ensure the machine spindle is fully stopped and the tool changer or spindle is in a safe state before loading the drill into the toolholder. Seat the straight shank fully and concentrically in the collet or chuck to minimize runout, which is critical at this diameter. When using coolant-through capability, verify that the machine spindle coolant circuit is compatible and that coolant pressure is set per the machining process requirements before initiating a cut.