{"product_id":"osg-31400801-spiral-point-sti-tap-1-4-20-unc-3-flute","title":"Osg 31400801 Spiral Point Sti Tap 1\/4-20 Unc 3 Flute","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe OSG 31400801 is a spiral point STI tap designed for tapping STI (Screw Thread Insert) holes in metal workpieces. It produces the oversized internal threads required to accept helical wire inserts, restoring or upgrading thread strength in aluminum, cast iron, steel, and similar materials. Built from powdered metal with an oxide finish, this tap is suited for production and maintenance applications where consistent thread form and tool longevity matter. It features a plug chamfer, 3 flutes, H3 thread limit, and a 2B class of fit on a 1\/4-20 UNC thread profile. Overall length is 2.72 inches with a thread length of 0.842 inches.\u003c\/p\u003e\n\u003cp\u003eThis tap is used in machining shops, maintenance facilities, and field repair environments where damaged or insufficient threads need to be rethreaded to accept insert sleeves. Typical applications include engine component repair, aerospace and automotive thread restoration, and industrial equipment maintenance. The 1\/4-20 UNC specification makes it a common fit for general-purpose fastener applications. It is installed by machinists, tool-and-die makers, and maintenance mechanics using a standard tap wrench or machine tapping setup.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e1\/4-20 UNC thread profile engineered for STI (Screw Thread Insert) thread preparation\u003c\/li\u003e\n  \u003cli\u003ePowdered metal construction provides wear resistance suitable for production use\u003c\/li\u003e\n  \u003cli\u003eOxide finish improves lubrication retention and reduces friction during cutting\u003c\/li\u003e\n  \u003cli\u003ePlug chamfer (3-5 thread lead) allows use in through-holes and moderately deep blind holes\u003c\/li\u003e\n  \u003cli\u003eH3 thread limit and 2B class of fit ensure proper tolerance for insert installation\u003c\/li\u003e\n  \u003cli\u003e3-flute design promotes efficient chip ejection ahead of the tap in through-hole applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style STI tap for use with 1\/4-20 UNC helical wire thread inserts in through-hole tapping applications across ferrous and non-ferrous workpiece materials.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThis tap is installed by qualified machinists or maintenance mechanics using a tap wrench, tapping head, or CNC machine configured for the correct thread pitch. Always apply appropriate cutting fluid for the workpiece material and ensure the tap is aligned perpendicular to the workpiece surface before engaging. Inspect the tap for wear or chipping before each use, and never force a tap that has stalled — back it out to clear chips. Follow the insert manufacturer specifications for hole preparation depth and diameter prior to tapping.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1\/4-20 UNC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 3\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChamfer Type\u003c\/strong\u003e: Plug\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Powdered Metal\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating \/ Finish\u003c\/strong\u003e: Oxide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClass of Fit\u003c\/strong\u003e: 2B\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Limit\u003c\/strong\u003e: H3\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThreads per Inch\u003c\/strong\u003e: 20\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2.72 inches (2-23\/32 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 0.842 inches (1-1\/8 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.318 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSquare Size\u003c\/strong\u003e: 0.238 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSquare Length\u003c\/strong\u003e: 0.375 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 314\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.05 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\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: 31400801\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51734613819698,"sku":"31400801","price":71.32,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/db4df97faa68e7982b1487039a495cea.jpg?v=1788763886","url":"https:\/\/voomisupply.com\/products\/osg-31400801-spiral-point-sti-tap-1-4-20-unc-3-flute","provider":"Voomi Supply","version":"1.0","type":"link"}