{"product_id":"osg-hp253-2598-screw-machine-drill-bit-0-2598-in-carbide","title":"Osg HP253-2598 Screw Machine Drill Bit 0.2598 in Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe OSG HP253-2598 is a screw machine length drill bit engineered for high-performance drilling in steel, alloy steel, and cast iron. It measures 0.2598 inches (6.60 mm) in diameter with a 140-degree split point and solid carbide construction throughout. The R-thinned web reduces thrust and improves chip evacuation at entry. Coolant-through capability makes this bit well-suited for deep-hole applications where heat buildup and chip clearing are primary concerns. Machinists, tool-and-die technicians, and production floor operators working with ferrous metals will find this bit appropriate for demanding, tight-tolerance work.\u003c\/p\u003e\u003cp\u003eThe HP253-2598 fits production drilling applications in machine shops, fabrication facilities, and industrial maintenance environments. Its screw machine (stub) length provides added rigidity compared to jobber-length bits, reducing deflection in high-feed or automated setups. The 3xD flute-to-diameter ratio supports chip flow in materials like mild steel, alloy steel, and cast iron. The straight-cylindrical shank with an 8.00 mm (0.315 inches) shank diameter seats securely in standard drill chucks and collet systems.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eSolid carbide construction for extended tool life in ferrous workpiece materials\u003c\/li\u003e\n\u003cli\u003e140-degree drill point angle reduces thrust and improves hole entry accuracy\u003c\/li\u003e\n\u003cli\u003eR-thinned, tapered web design lowers cutting resistance and aids chip removal\u003c\/li\u003e\n\u003cli\u003eCoolant-through design supports heat management in deep-hole and high-speed operations\u003c\/li\u003e\n\u003cli\u003eScrew machine length provides increased rigidity over jobber-length alternatives\u003c\/li\u003e\n\u003cli\u003eRight-hand spiral flute with regular helix for consistent chip evacuation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for drilling in steel, alloy steel, and cast iron workpieces. Part of the OSG HP253 series, covering the 0.2500 to 0.3000 inch (6.50 to 8.00 mm) diameter range.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstall in a compatible drill chuck or collet sized for an 8.00 mm straight-cylindrical shank before starting the machine. Verify spindle speed and feed rate are set per the material being drilled before engaging the cut. Connect coolant supply lines if using the through-coolant feature, and confirm adequate coolant pressure and flow before running. Inspect the cutting edge for chipping or wear before each use, as carbide tooling is brittle and should never be used in a visibly damaged condition.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Diameter\u003c\/strong\u003e: 0.2598 inches (6.60 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Point Angle\u003c\/strong\u003e: 140 degrees\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: Coated\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: Spiral, Regular Helix\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 34.00 mm (1.339 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 79.00 mm (3.110 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: 8.00 mm (0.315 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb Thinning\u003c\/strong\u003e: R-Thinned\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Tapered\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Length Type\u003c\/strong\u003e: Screw Machine\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute by Diameter Ratio\u003c\/strong\u003e: 3xD\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiameter Tolerance\u003c\/strong\u003e: +0.006 to +0.021 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Material\u003c\/strong\u003e: Steel, Alloy Steel, Cast Iron\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: HP253\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.089 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: OSG\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: HP253-2598\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51730710888754,"sku":"HP253-2598","price":132.24,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/4277ad0415248d5cef9bda7f66060dcf.jpg?v=1788721632","url":"https:\/\/voomisupply.com\/products\/osg-hp253-2598-screw-machine-drill-bit-0-2598-in-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}