{"product_id":"osg-1645056185-spiral-flute-tap-5-16-18-unc-tin-hss","title":"Osg 1645056185 Spiral Flute Tap 5\/16-18 Unc Tin Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe OSG 1645056185 is a spiral flute tap designed to cut 5\/16-18 UNC internal threads in a wide range of ferrous materials. Built from vanadium high-speed steel with a titanium nitride (TiN) coating, it delivers extended tool life and reduced friction during the tapping cycle. The modified bottoming chamfer allows threading close to the bottom of blind holes, making it well suited for tight-tolerance applications. With a 45-degree helix angle and right-hand flute direction, it efficiently evacuates chips upward out of the hole. Machinists and tool-and-die technicians working to a 2B class of fit will find it meets standard dimensional requirements for general mechanical assembly.\u003c\/p\u003e\n\u003cp\u003eThis tap is intended for use in CNC machining centers, manual mills, and tapping machines where 5\/16-18 UNC threads are required in blind or shallow through-hole configurations. Its H5 thread limit makes it appropriate for production environments where consistent 2B fit tolerances are maintained across multiple parts. Material suitability includes alloy steel, cast iron, high-carbon steel, low-carbon steel, medium-carbon steel, and stainless steel. It is sold individually and is part of OSG Series 16450.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eModified bottoming chamfer for threading close to the bottom of blind holes\u003c\/li\u003e\n  \u003cli\u003e45-degree right-hand helix angle promotes upward chip evacuation in blind-hole applications\u003c\/li\u003e\n  \u003cli\u003eTiN coating reduces friction and extends tool life in ferrous materials\u003c\/li\u003e\n  \u003cli\u003eVanadium high-speed steel construction provides toughness and wear resistance\u003c\/li\u003e\n  \u003cli\u003eH5 thread limit holds consistent 2B class of fit tolerances\u003c\/li\u003e\n  \u003cli\u003e3-flute design balances chip removal with tool rigidity at this thread size\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eSuited for tapping 5\/16-18 UNC threads in alloy steel, cast iron, high-carbon steel, low-carbon steel, medium-carbon steel, and stainless steel workpieces. Designed for use in standard tap holders and collet chucks accepting a 0.318-inch shank diameter.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a qualified machinist following standard tapping procedures for the workpiece material. Secure the tap in a properly sized tap holder or rigid collet chuck before operation; avoid excessive runout, which can break taps at this diameter. Apply appropriate cutting fluid for the workpiece material to extend tool life and improve thread finish. Always bring the spindle to a full stop before inspecting the tap or removing the workpiece.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 5\/16-18 UNC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNC\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\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\u003eFlute Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThreads per Inch\u003c\/strong\u003e: 18\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3.543 inches (90 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 0.445 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTapping Depth\u003c\/strong\u003e: 1.125 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNeck Length\u003c\/strong\u003e: 1.378 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 Length\u003c\/strong\u003e: 0.375 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\u003eMaterial\u003c\/strong\u003e: Vanadium High-Speed Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: Titanium Nitride (TiN)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.06 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 16450\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: 1645056185\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51739884028210,"sku":"1645056185","price":106.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/d6b590edd79036923d4358b2fa09f92d_af4ee9b0-2b20-4756-ad88-6fd7743e6e18.jpg?v=1788820039","url":"https:\/\/voomisupply.com\/products\/osg-1645056185-spiral-flute-tap-5-16-18-unc-tin-hss","provider":"Voomi Supply","version":"1.0","type":"link"}