{"product_id":"osg-1600807-straight-flute-tap-5-16-18-unc-bottoming-hss","title":"Osg 1600807 Straight Flute Tap 5\/16-18 Unc Bottoming Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe OSG 1600807 is a straight flute bottoming tap designed for cutting 5\/16-18 UNC internal threads in production and repair applications. Built from high-speed steel with a nitride\/oxide coating, this tap delivers consistent thread quality with reduced friction and improved wear resistance. The bottoming chamfer geometry allows threading to the base of blind holes, making it suitable for tight-tolerance fastener applications. With a 3B class of fit and H3 thread limit, it produces threads within the standard tolerance band required for most commercial and precision assemblies. Licensed machinists, tool-and-die makers, and maintenance technicians are the primary users.\u003c\/p\u003e\u003cp\u003eThis tap is suited for use in aluminum and cast iron workpieces across manual tapping, turret lathe, and CNC drilling operations. The straight flute design works best in through-hole applications and short blind holes where chip clearance is managed by the operator. The 101C series designation indicates a standard geometry configuration. The right-hand thread direction is standard for the vast majority of fastener applications. The H3 oversize limit supports plated or coated fastener clearance where a slightly looser fit is acceptable.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eBottoming chamfer for threading to the bottom of blind holes\u003c\/li\u003e\n\u003cli\u003eHigh-speed steel construction for durability across ferrous and non-ferrous materials\u003c\/li\u003e\n\u003cli\u003eNitride\/oxide coating reduces friction and improves tool life\u003c\/li\u003e\n\u003cli\u003e3B class of fit with H3 thread limit for standard commercial tolerance\u003c\/li\u003e\n\u003cli\u003e4 straight flutes for chip management in short blind and through-hole applications\u003c\/li\u003e\n\u003cli\u003eCompatible with aluminum and cast iron workpiece materials\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for threading 5\/16-18 UNC holes in aluminum and cast iron. Suitable for use in standard tapping chucks, tap handles, and CNC rigid tapping setups that accept a 0.318-inch shank diameter.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis tap should be installed in a properly aligned tapping chuck or tap wrench to prevent thread misalignment or tap breakage. Secure the workpiece fully before tapping and apply cutting fluid appropriate to the workpiece material. Reverse the tap periodically during manual operation to break and clear chips. Do not force the tap beyond its rated thread depth, particularly in blind holes where bottoming contact can cause breakage.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\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: 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChamfer Type\u003c\/strong\u003e: Bottoming\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClass of Fit\u003c\/strong\u003e: 3B\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Limit\u003c\/strong\u003e: H3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread 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\u003eMaterial\u003c\/strong\u003e: High-Speed Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Nitride\/Oxide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Application\u003c\/strong\u003e: Aluminum, Cast Iron\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2-23\/32 inches (2.720 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 1-1\/8 inches (0.835 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\u003eNeck Length\u003c\/strong\u003e: 1.323 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: 101C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.047 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\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: 1600807\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51739809349938,"sku":"1600807","price":23.52,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/326d7ab8b02d8071a42bd324ef4f1ff7_14eb3612-7bce-404f-b8ae-97377df6d037.jpg?v=1788819108","url":"https:\/\/voomisupply.com\/products\/osg-1600807-straight-flute-tap-5-16-18-unc-bottoming-hss","provider":"Voomi Supply","version":"1.0","type":"link"}