Kennametal 3858210 Taper Length Drill Bit 4.2mm Carbide

Product Description

The KENNAMETAL 3858210 is a solid carbide taper length drill bit in the B978A series, designed for precision hole-making in demanding production environments. It carries a multilayer TiAlN coating and a 132-degree point angle for clean entry and reduced thrust in hard and abrasive workpiece materials. The bit runs a right-hand, spiral flute configuration with a straight cylindrical shank measuring 6 mm (0.2362 inches) in diameter. Coolant-through capability supports chip evacuation and thermal control during deep drilling cycles. Licensed machinists, tool-and-die workers, and CNC setup technicians are the primary installers.

This drill bit is suited for CNC machining centers and drill presses handling tight-tolerance bores in steel, stainless, cast iron, and similar ferrous materials. The 8xD flute-to-diameter ratio makes it well matched to moderately deep holes where chip packing is a concern. The DIN 6537K specification provides a recognized international benchmark for dimensional conformance, supporting interchangeability in European and globally sourced tooling programs. Material grade KC7315 targets wear resistance in interrupted and continuous cuts at elevated surface speeds.

Key Features

• Solid carbide construction in material grade KC7315 for high wear resistance
• Multilayer TiAlN coating reduces heat buildup and extends tool life in hard materials
• 132-degree standard point angle for accurate self-centering and reduced thrust
• Coolant-through design aids chip evacuation in deep-hole drilling applications
• Tapered web configuration maintains core strength across the full flute length
• DIN 6537K compliant for dimensional interchangeability in precision tooling setups

Compatibility

Designed as an OEM-style replacement or production tooling option for machining operations requiring a straight-shank taper length drill in the 4.2 mm diameter class per DIN 6537K specification.

Installation Notes

Installation should be performed by a qualified machinist or CNC technician. Confirm spindle speed, feed rate, and coolant pressure are set per the machine tool manufacturer and tooling recommendations before starting a cut. Inspect the shank and collet or chuck bore for chips or damage before clamping to avoid runout. Never force the bit into a bore or use it beyond its rated maximum drilling depth of 41 mm (1.6142 inches).