{"product_id":"kennametal-4150253-screw-machine-drill-bit-8mm-carbide","title":"Kennametal 4150253 Screw Machine Drill Bit 8mm Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe KENNAMETAL 4150253 is a screw machine length (stub length) solid carbide drill bit designed for precision drilling in metal fabrication, machining, and tooling applications. Built to DIN 6537K standards, this 8.00 mm diameter bit features a 140-degree point angle and a multilayer TiAlN coating at the tip for extended wear resistance and heat dissipation at cutting speeds common in CNC and manual drill press operations. The overall length is 79.00 mm (3.1102 inches), making it compact and rigid for reduced deflection in short-hole drilling. It is part of Kennametal series B041A-CPG and is sized for use in standard straight-shank toolholders and chucks.\u003c\/p\u003e\u003cp\u003eThis drill bit is suited for production machining environments where hole depth requirements are modest and rigidity is a priority. The stub length format limits overhang, which reduces vibration and improves hole location accuracy compared to jobber-length alternatives. Typical applications include drilling steel, cast iron, and similar ferrous materials on CNC machining centers, turret lathes, and drill presses. The 3xD flute-to-diameter ratio and tapered web configuration support chip evacuation in short, blind, or through-hole drilling tasks. Licensed machinists and tool-and-die technicians are the primary installers and users of this bit.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eSolid carbide construction for rigidity and wear life in ferrous and hard materials\u003c\/li\u003e\n\u003cli\u003eTiAlN tip coating resists heat buildup and extends cutting edge life\u003c\/li\u003e\n\u003cli\u003e140-degree point angle reduces thrust force and centers the drill on entry\u003c\/li\u003e\n\u003cli\u003eDIN 6537K specification ensures dimensional consistency for toolholder compatibility\u003c\/li\u003e\n\u003cli\u003eStub length (3xD ratio) minimizes deflection in short-hole applications\u003c\/li\u003e\n\u003cli\u003eStraight cylindrical shank fits standard drill chucks and collet holders without modification\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-specification solid carbide stub drill for use in straight-shank toolholders and drill chucks accepting an 8.00 mm (0.3150 inch) shank diameter, conforming to DIN 6537K dimensional standards.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation and use of this drill bit should be performed by qualified machinists familiar with cutting tool safety and machine setup procedures. Ensure the spindle is fully stopped and the machine is powered down before inserting or removing the bit from the chuck or collet holder. Confirm shank seating depth and runout with a dial indicator before beginning a production run. Do not exceed the maximum drilling depth of 29.00 mm (1.1417 inches) per the tool geometry rating.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Diameter\u003c\/strong\u003e: 8.00 mm (0.3150 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 79.00 mm (3.1102 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 41.00 mm (1.6142 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\u003eShank Diameter\u003c\/strong\u003e: 8.00 mm (0.3150 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Drilling Depth\u003c\/strong\u003e: 29.00 mm (1.1417 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: 1.36 mm (0.0535 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\u003eFlute Type\u003c\/strong\u003e: Regular Spiral\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Tapered\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\u003eFlute-to-Diameter Ratio\u003c\/strong\u003e: 3xD\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\u003eDiameter Tolerance\u003c\/strong\u003e: -0.015 to 0.000 mm (-0.0006 to 0.0000 inches)\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: 0.1 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: 4150253\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KENNAMETAL","offers":[{"title":"Default Title","offer_id":51728470671666,"sku":"4150253","price":104.02,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/c588bc1a58b8c5172f2213195037e8e4.jpg?v=1788691728","url":"https:\/\/voomisupply.com\/products\/kennametal-4150253-screw-machine-drill-bit-8mm-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}