{"product_id":"osg-34500708-spiral-flute-sti-tap-m8x1-25-3-flute","title":"Osg 34500708 Spiral Flute Sti Tap M8x1.25 3 Flute","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe OSG 34500708 is a spiral flute STI (Screw Thread Insert) tap designed for cutting metric coarse internal threads in preparation for thread insert installation. Built from powdered metal with a V finish coating, this tap produces a 6H class of fit thread in M8x1.25 applications. The 15-degree helix angle promotes efficient chip evacuation in through and blind hole applications. With an overall length of 2-15\/16 inches and a shank diameter of 0.381 inches, it is sized for standard tap holders and CNC tooling. The modified bottoming chamfer allows threading close to the bottom of a blind bore, making it well suited for tight-tolerance insert prep work in manufacturing, aerospace, and general machining environments.\u003c\/p\u003e\n\u003cp\u003eThis tap is used in metalworking operations where a damaged or weak M8x1.25 thread needs to be restored or upsized using a helical coil or keensert-style thread insert. The 3-flute, right-hand spiral flute geometry is appropriate for a range of materials including steel, aluminum, and cast iron. A thread length of 1-1\/4 inches accommodates typical insert-depth requirements. Machinists, tool and die makers, and MRO maintenance technicians commonly use this tap in both manual and CNC tapping setups.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eM8x1.25 metric coarse thread size produces 6H class of fit for standard thread insert tolerances\u003c\/li\u003e\n  \u003cli\u003ePowdered metal construction provides improved wear resistance compared to standard HSS\u003c\/li\u003e\n  \u003cli\u003e15-degree helix angle supports chip flow in both through-hole and blind-hole applications\u003c\/li\u003e\n  \u003cli\u003eModified bottoming chamfer allows threading close to the bottom of a blind bore\u003c\/li\u003e\n  \u003cli\u003eRight-hand flute direction compatible with standard tapping attachments and CNC spindles\u003c\/li\u003e\n  \u003cli\u003eV finish coating reduces friction and helps extend tool life in production environments\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use in STI tapping applications requiring an M8x1.25 metric coarse thread, 6H class of fit, as part of the OSG Series 345STI product line. Fits standard tap holders sized for a 0.381-inch shank diameter.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThis tap should be installed by a qualified machinist or tooling technician familiar with STI tapping procedures. Always ensure the workpiece is securely fixtured and the spindle or tap handle is properly aligned before beginning the cut. Use appropriate tapping fluid for the workpiece material to reduce heat and extend tool life. Inspect the tap for wear or chipping before each use, and never force a tap that shows resistance beyond normal cutting load.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: M8x1.25\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: Metric Coarse\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClass of Fit\u003c\/strong\u003e: 6H\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Limit\u003c\/strong\u003e: D3\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 3\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: Modified Bottoming\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2-15\/16 inches (74.7 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 1-1\/4 inches (12 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.381 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: 345STI\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.08 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 27112806\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: 34500708\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51739540128050,"sku":"34500708","price":93.24,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/4508c82feff64c856ebfd48472288b49.jpg?v=1788815963","url":"https:\/\/voomisupply.com\/products\/osg-34500708-spiral-flute-sti-tap-m8x1-25-3-flute","provider":"Voomi Supply","version":"1.0","type":"link"}