{"product_id":"osg-31401308-spiral-point-sti-tap-3-8-16-unc-plug","title":"Osg 31401308 Spiral Point Sti Tap 3\/8-16 Unc Plug","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe OSG 31401308 is a spiral point STI tap designed for cutting 3\/8-16 UNC threads in through-hole applications. Built from powdered metal with a V finish, this plug chamfer tap drives chips forward ahead of the cutting zone, making it well suited for production tapping in materials where chip evacuation is critical. It carries a 3-3\/8 inch overall length, a thread length of 1-21\/32 inches, and is ground to H4 thread limit with a 2B class of fit. Licensed HVAC, plumbing, and mechanical tradespeople rely on STI taps to restore damaged threads or create new insert-ready holes in metal components and fixtures.\u003c\/p\u003e\n\u003cp\u003eThis tap is appropriate for through-hole tapping operations in ferrous and non-ferrous metals where a Heli-Coil or similar threaded insert will be installed after tapping. The spiral point design is best suited for through holes rather than blind holes, as the flute geometry pushes chips forward. It is used in maintenance, repair, and fabrication shops as well as on job sites requiring thread repair in structural or mechanical components.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eSpiral point geometry evacuates chips forward, optimizing performance in through-hole applications\u003c\/li\u003e\n  \u003cli\u003ePowdered metal construction provides wear resistance in production tapping environments\u003c\/li\u003e\n  \u003cli\u003eV finish supports use across a range of common workpiece materials\u003c\/li\u003e\n  \u003cli\u003ePlug chamfer (3-5 thread lead) provides a balance of starting ease and thread engagement\u003c\/li\u003e\n  \u003cli\u003eH4 thread limit and 2B class of fit ensure accurate sizing for STI insert applications\u003c\/li\u003e\n  \u003cli\u003e3 flute configuration in OSG Series 314\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an STI (Screw Thread Insert) tap producing 3\/8-16 UNC threads sized to accept standard Heli-Coil style threaded inserts in through-hole configurations.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThis tap should be installed by a qualified machinist or maintenance technician using a calibrated tap handle or tapping machine set to appropriate feed and speed for the workpiece material. Secure the workpiece fully before tapping and apply cutting fluid appropriate to the material being tapped. Never force a tap — back off periodically to break chips even with a spiral point design. Follow shop safety practices and applicable workplace standards for rotating tooling.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 3\/8-16 UNC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThreads per Inch\u003c\/strong\u003e: 16\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 3\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChamfer\u003c\/strong\u003e: Plug\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: H4\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3.382 inches (3-3\/8 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 0.874 inches (1-21\/32 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.367 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSquare Length\u003c\/strong\u003e: 0.4375 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSquare Size\u003c\/strong\u003e: 0.2750 inches\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: V\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: 0.11 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: 31401308\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51729633476914,"sku":"31401308","price":118.48,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/abea129aabf490a130a041d4cdc8dc2e_48b2ceb9-d674-4770-9d7a-277fbc226a0d.jpg?v=1788706996","url":"https:\/\/voomisupply.com\/products\/osg-31401308-spiral-point-sti-tap-3-8-16-unc-plug","provider":"Voomi Supply","version":"1.0","type":"link"}