{"product_id":"osg-1723501-spiral-flute-tap-1-2-20-unf-vanadium-hss","title":"Osg 1723501 Spiral Flute Tap 1\/2-20 Unf Vanadium Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe OSG 1723501 is a spiral flute tap designed for cutting internal threads in a 1\/2-20 UNF configuration. It is built from vanadium high-speed steel and finished with a steam oxide coating that reduces friction and helps resist corrosion during service. With a 45-degree helix angle and a modified bottoming chamfer, this tap is suited for threading holes where the thread must extend close to the bottom of a blind bore. The H5 thread limit and 2B class of fit deliver consistent tolerance control for precision threaded assemblies. Machinists, toolroom technicians, and maintenance professionals install this tap in drill presses, CNC machining centers, and manual tapping operations.\u003c\/p\u003e\n\u003cp\u003eThis tap is intended for use on stainless steel, high-carbon steel, low-carbon steel, and medium-carbon steel workpieces. The 45-degree spiral flute angle efficiently evacuates chips upward out of the hole, making it especially effective in blind-hole applications where chip packing is a concern. The modified bottoming chamfer allows threading to within a minimal distance of the hole bottom, which is common in automotive, aerospace, and general machining work where thread engagement length is critical.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e1\/2-20 UNF thread form with H5 thread limit and 2B class of fit for controlled tolerance\u003c\/li\u003e\n  \u003cli\u003e45-degree right-hand spiral flute geometry promotes upward chip evacuation in blind holes\u003c\/li\u003e\n  \u003cli\u003eModified bottoming chamfer enables threading close to the bottom of a blind bore\u003c\/li\u003e\n  \u003cli\u003eVanadium high-speed steel construction provides toughness and wear resistance in steel applications\u003c\/li\u003e\n  \u003cli\u003eSteam oxide coating reduces friction and provides light corrosion protection during storage and use\u003c\/li\u003e\n  \u003cli\u003e3-flute design balances chip clearance with thread-form support across the cut\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for threading stainless steel, high-carbon steel, low-carbon steel, and medium-carbon steel workpieces requiring a 1\/2-20 UNF internal thread to a 2B class of fit. Part of the OSG Series 303 spiral flute tap line.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by qualified machinists or maintenance technicians using a drill press, tapping head, or CNC machine with rigid or floating tap holders. Always ensure the pilot hole is drilled to the correct tap-drill diameter for a 1\/2-20 UNF thread before tapping. Apply a suitable cutting fluid for the workpiece material, and do not exceed the tap's rated capacity for the material being cut. For blind-hole applications, verify hole depth is sufficient to accommodate the tap's overall length of 3.375 inches before starting.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1\/2-20 UNF\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNF\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThreads per Inch\u003c\/strong\u003e: 20\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 3\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Style\u003c\/strong\u003e: Spiral\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: 45 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChamfer\u003c\/strong\u003e: Modified Bottoming\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: H5\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Vanadium High-Speed Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Steam Oxide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Application\u003c\/strong\u003e: Stainless Steel, High-Carbon Steel, Low-Carbon Steel, Medium-Carbon Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3.375 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 0.614 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNeck Length\u003c\/strong\u003e: 1.933 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: 0.275 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: 303\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.103 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: 1723501\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51739864727858,"sku":"1723501","price":86.43,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/a8d46501e34692caf1dba263b63e9879.jpg?v=1788819798","url":"https:\/\/voomisupply.com\/products\/osg-1723501-spiral-flute-tap-1-2-20-unf-vanadium-hss","provider":"Voomi Supply","version":"1.0","type":"link"}