{"product_id":"osg-1251402-spiral-flute-pipe-tap-1-4-18-nptf-hss","title":"Osg 1251402 Spiral Flute Pipe Tap 1\/4-18 Nptf Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe OSG 1251402 is a spiral flute pipe tap designed for cutting 1\/4-18 NPTF internal pipe threads in metal workpieces. It features four right-hand flutes with a 15-degree helix angle that evacuates chips upward out of the hole, making it well suited for blind-hole tapping applications. The bottoming chamfer allows threading closer to the bottom of a bore. Manufactured from high-speed steel and finished with OSG elektraLUBE coating, this tap provides a built-in lubricity layer that reduces friction and extends tool life in production and job-shop environments. Overall length is 2-7\/16 inches with a shank diameter of 0.5625 inches.\u003c\/p\u003e\u003cp\u003eThis tap is used wherever a leak-free NPTF tapered pipe thread connection is required. Typical applications include tapping ports in hydraulic manifolds, pneumatic fittings, fluid system components, and pipe couplings. It is installed by machinists and pipe fitters working with drill presses, CNC machining centers, or tapping heads. The NPTF thread standard produces a pressure-tight mechanical seal without relying solely on sealant compounds, making it a common specification in fluid power and plumbing assemblies.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e1\/4-18 NPTF thread size for tapered pipe thread applications requiring pressure-tight seals\u003c\/li\u003e\n\u003cli\u003eFour right-hand spiral flutes with 15-degree helix angle for efficient chip evacuation in blind holes\u003c\/li\u003e\n\u003cli\u003eBottoming chamfer allows threading to within close proximity of hole bottom\u003c\/li\u003e\n\u003cli\u003eHigh-speed steel construction provides toughness across a range of workpiece materials\u003c\/li\u003e\n\u003cli\u003eelektraLUBE finish reduces friction and cutting forces, extending tap service life\u003c\/li\u003e\n\u003cli\u003eSeries S125 design with 0.3750-inch projection and 0.4210-inch square size for standard tap holders\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use in standard tap holders and tapping heads that accept a 0.5625-inch shank diameter with a 0.4210-inch drive square. Intended for cutting 1\/4-18 NPTF tapered pipe threads per the NPTF thread standard.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a qualified machinist or pipe fitter using a properly sized tap holder, tapping head, or machine spindle. Ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap-drill diameter per NPTF specification before tapping. Apply cutting fluid appropriate for the workpiece material even when using the elektraLUBE-coated tap to further reduce heat and wear. Never force a tap that has stopped turning freely, as breakage may result and the tap may become lodged in the workpiece.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1\/4-18 NPTF\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: NPTF\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHelix Angle\u003c\/strong\u003e: 15 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChamfer\u003c\/strong\u003e: Bottoming\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: High-Speed Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: elektraLUBE\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2-7\/16 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 1-1\/16 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.5625 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSquare Size\u003c\/strong\u003e: 0.4210 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProjection\u003c\/strong\u003e: 0.3750 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: S125\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.11 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: 1251402\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51743476220210,"sku":"1251402","price":99.64,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/bbac0847d077abd28945ecfec10b5d14.jpg?v=1788847458","url":"https:\/\/voomisupply.com\/products\/osg-1251402-spiral-flute-pipe-tap-1-4-18-nptf-hss","provider":"Voomi Supply","version":"1.0","type":"link"}