{"product_id":"kennametal-4150191-screw-machine-drill-bit-3-90mm-carbide","title":"Kennametal 4150191 Screw Machine Drill Bit 3.90mm Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe KENNAMETAL 4150191 is a screw machine length (stub) drill bit designed for high-precision drilling in metal and hard materials. Built from solid carbide with a multilayer TiAlN coating at the tip, this bit delivers extended tool life and thermal resistance in demanding production environments. It features a 140-degree point angle for aggressive, self-centering entry with reduced thrust. The straight-cylindrical shank measures 6.00 mm in diameter, and the overall length is 66.00 mm (approximately 2.60 inches). With a right-hand, regular spiral flute design and tapered web configuration, it suits CNC machining centers, drill presses, and screw machine applications where rigidity and repeatability are critical.\u003c\/p\u003e\u003cp\u003eThis drill bit is intended for use in metalworking and precision machining environments, including production shops, job shops, and toolrooms. The stub-length body reduces deflection and improves rigidity compared to jobber-length equivalents, making it well suited for close-tolerance hole work in steel, stainless, cast iron, and similar ferrous materials. It is typically installed in machining centers, CNC lathes, or drill presses where accurate, repeatable hole diameter is required. The 3xD flute-to-diameter ratio supports chip evacuation in shallow to moderate-depth holes without coolant-through assist.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eSolid carbide construction for rigidity and wear resistance in hard materials\u003c\/li\u003e\n\u003cli\u003eMultilayer TiAlN coating at tip reduces heat buildup and extends cutting life\u003c\/li\u003e\n\u003cli\u003e140-degree point angle for fast, self-centering penetration with lower thrust\u003c\/li\u003e\n\u003cli\u003eStub (screw machine) length body minimizes deflection for tight-tolerance work\u003c\/li\u003e\n\u003cli\u003eRight-hand regular spiral flute with tapered web for efficient chip clearing\u003c\/li\u003e\n\u003cli\u003eStraight-cylindrical shank compatible with standard collets and drill chucks\u003c\/li\u003e\n\u003cli\u003eConforms to DIN 6537K specification for dimensional consistency\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement and standard production drill bit in the KENNAMETAL Series B041A-CPG. Fits any toolholder or collet accepting a 6.00 mm straight-cylindrical shank. Suitable for the decimal-inch diameter range 0.1500 to 0.2000 inch and metric range 3.50 to 5.00 mm.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a qualified machinist or toolroom technician. Ensure the machine spindle is fully powered down and locked out before changing tooling. Secure the shank fully in the collet or drill chuck to the minimum grip depth recommended for the holder being used; insufficient engagement increases deflection and risk of pullout. Do not exceed the maximum drilling depth of 17.00 mm (approximately 0.67 inches) for this stub-length geometry without retracting to clear chips.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Diameter\u003c\/strong\u003e: 3.90 mm (0.1535 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 66.00 mm (2.5984 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 24.00 mm (0.9449 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Drilling Depth\u003c\/strong\u003e: 17.00 mm (0.6693 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 6.00 mm (0.2362 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 36.00 mm (1.4173 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Point Angle\u003c\/strong\u003e: 140 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Point Length\u003c\/strong\u003e: 0.64 mm (0.0252 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTool Material\u003c\/strong\u003e: Solid Carbide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: TiAlN (Tip)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpiral Type\u003c\/strong\u003e: Regular\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight Cylindrical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePoint Type\u003c\/strong\u003e: Standard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Tapered\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute by Diameter Ratio\u003c\/strong\u003e: 3xD\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Length Type\u003c\/strong\u003e: Stub (Screw Machine)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiameter Tolerance\u003c\/strong\u003e: -0.0005 to 0.0000 inches (-0.012 to 0.000 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecification\u003c\/strong\u003e: DIN 6537K\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: B041A-CPG\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.46 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: 4150191\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KENNAMETAL","offers":[{"title":"Default Title","offer_id":51737788416306,"sku":"4150191","price":95.1,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/027550a92e9fb7c9c67a753ee7e2e1a8_909cdf9c-5e97-4ece-a454-15fd8c05a11c.jpg?v=1788793570","url":"https:\/\/voomisupply.com\/products\/kennametal-4150191-screw-machine-drill-bit-3-90mm-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}