{"product_id":"osg-1761801-spiral-flute-tap-3-8-16-unc-modified-bottoming","title":"Osg 1761801 Spiral Flute Tap 3\/8-16 Unc Modified Bottoming","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe OSG 1761801 is a spiral flute tap designed for cutting 3\/8-16 UNC internal threads in a range of ferrous materials. Built from vanadium high-speed steel and finished with a steam oxide coating, it is engineered for durability and chip evacuation in through-hole and blind-hole applications. The spiral flute geometry, running at a 45-degree helix angle, pulls chips up and out of the hole, making it well suited to tougher materials like stainless steel where chip packing is a concern. With a modified bottoming chamfer, this tap threads close to the bottom of a blind hole while still entering cleanly. It carries a 2B class of fit and an H7 thread limit, targeting standard commercial tolerance threads.\u003c\/p\u003e\u003cp\u003eThis tap is intended for use in machining, fabrication, and maintenance environments where 3\/8-16 UNC threads are required in stainless steel, high-carbon steel, medium-carbon steel, and low-carbon steel. The modified bottoming chamfer makes it appropriate for blind holes where full thread depth near the bottom is needed. It is part of OSG Series 303 and is sized for use in standard tap holders and CNC or manual tapping setups. Licensed machinists, tool-and-die makers, and maintenance mechanics are the primary users.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e45-degree right-hand spiral flute geometry evacuates chips upward, reducing packing in blind holes\u003c\/li\u003e\n\u003cli\u003eModified bottoming chamfer allows threading close to the bottom of a blind hole\u003c\/li\u003e\n\u003cli\u003eVanadium high-speed steel construction provides increased wear resistance over standard HSS\u003c\/li\u003e\n\u003cli\u003eSteam oxide coating reduces friction and provides light corrosion resistance during storage and use\u003c\/li\u003e\n\u003cli\u003eH7 thread limit and 2B class of fit meet standard commercial tolerance requirements\u003c\/li\u003e\n\u003cli\u003eNo coolant-through design; suitable for use with external cutting fluid application\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eRated for use in stainless steel, high-carbon steel, medium-carbon steel, and low-carbon steel. Designed as an OEM-style replacement or direct-use tap for any application requiring 3\/8-16 UNC threads at 2B class of fit.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis tap should be installed by a qualified machinist or maintenance technician familiar with tapping operations and appropriate cutting speeds for the workpiece material. Always apply a suitable cutting fluid for the material being tapped, particularly when working with stainless steel. Secure the workpiece firmly before tapping and ensure the tap is aligned perpendicular to the drilled hole to avoid tap breakage. Follow shop safety procedures and OSHA standards for machine tool operation.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\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\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\u003eFlute Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Direction\u003c\/strong\u003e: Right Hand\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: H7\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThreads per Inch\u003c\/strong\u003e: 16\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: Steam Oxide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Application\u003c\/strong\u003e: Stainless Steel, High-Carbon Steel, Medium-Carbon Steel, Low-Carbon Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2.9375 inches (2-15\/16 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 1.25 inches (1-1\/4 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\u003eShank Length\u003c\/strong\u003e: 0.381 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\u003eSquare Length\u003c\/strong\u003e: 0.4375 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSquare Size\u003c\/strong\u003e: 0.286 inches\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: 0.075 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: 1761801\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51732293321010,"sku":"1761801","price":63.08,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/3d71892ed71c6d5558c36060225e7810.jpg?v=1788741278","url":"https:\/\/voomisupply.com\/products\/osg-1761801-spiral-flute-tap-3-8-16-unc-modified-bottoming","provider":"Voomi Supply","version":"1.0","type":"link"}