{"product_id":"kennametal-3858210-taper-length-drill-bit-4-2mm-carbide","title":"Kennametal 3858210 Taper Length Drill Bit 4.2mm Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe 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.\u003c\/p\u003e\u003cp\u003eThis 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.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eSolid carbide construction in material grade KC7315 for high wear resistance\u003c\/li\u003e\n\u003cli\u003eMultilayer TiAlN coating reduces heat buildup and extends tool life in hard materials\u003c\/li\u003e\n\u003cli\u003e132-degree standard point angle for accurate self-centering and reduced thrust\u003c\/li\u003e\n\u003cli\u003eCoolant-through design aids chip evacuation in deep-hole drilling applications\u003c\/li\u003e\n\u003cli\u003eTapered web configuration maintains core strength across the full flute length\u003c\/li\u003e\n\u003cli\u003eDIN 6537K compliant for dimensional interchangeability in precision tooling setups\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned 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.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation 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).\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: B978A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Diameter\u003c\/strong\u003e: 4.2 mm (0.1654 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Point Angle\u003c\/strong\u003e: 132 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTool Material\u003c\/strong\u003e: Solid Carbide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: KC7315\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: Multilayer TiAlN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 49 mm (1.9291 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 87 mm (3.4 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight Cylindrical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 6 mm (0.2362 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 36 mm (1.4173 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Drilling Depth\u003c\/strong\u003e: 41 mm (1.6142 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Point Length\u003c\/strong\u003e: 0.86 mm (0.0339 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Spiral (Regular)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length to Diameter Ratio\u003c\/strong\u003e: 8xD\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Tapered\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Diameter Tolerance\u003c\/strong\u003e: +0.0002 to +0.0006 inches (+0.004 to +0.016 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecification\u003c\/strong\u003e: DIN 6537K\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.049 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: KENNAMETAL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 3858210\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KENNAMETAL","offers":[{"title":"Default Title","offer_id":51755233870130,"sku":"3858210","price":321.24,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/1f6d90035cd1fd88c81b92601bafc035_6d84aa35-f004-4a5c-a03b-befb2503aa9c.jpg?v=1788952462","url":"https:\/\/voomisupply.com\/products\/kennametal-3858210-taper-length-drill-bit-4-2mm-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}