{"product_id":"osg-1121201-straight-flute-tap-3-8-16-unc-hss-oxide","title":"Osg 1121201 Straight Flute Tap 3\/8-16 Unc Hss Oxide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe OSG 1121201 is a straight flute hand tap designed for cutting 3\/8-16 UNC right-hand threads in a variety of ferrous and non-ferrous materials. Built from high-speed steel with an oxide coating for improved lubricity and wear resistance, this tap features a taper chamfer that guides the tool into the workpiece gradually, distributing cutting forces across multiple leading threads. With 4 flutes and an H3 thread limit, it is suited for producing Class 3B fit threads that meet general-purpose tolerance requirements. The overall length is 2-15\/16 inches with a thread length of 1-1\/4 inches, making it a standard-proportioned tap for most benchtop or machine-assisted hand-tapping applications.\u003c\/p\u003e\n\u003cp\u003eThis tap is intended for use in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. The taper chamfer style makes it the preferred starting tap when threading a through hole or when beginning a blind hole sequence. Machinists, toolroom technicians, and maintenance professionals use this tap in drill presses, tapping fixtures, or by hand with a standard tap wrench. It belongs to OSG Series 101, a widely stocked straight flute tap line for general industrial and MRO use.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e3\/8-16 UNC thread form with right-hand direction and Class 3B fit\u003c\/li\u003e\n  \u003cli\u003eH3 thread limit for controlled oversize tolerance in standard steel and aluminum applications\u003c\/li\u003e\n  \u003cli\u003eTaper chamfer distributes cutting load across 7-10 leading threads for easier thread starting\u003c\/li\u003e\n  \u003cli\u003eHigh-speed steel construction provides toughness across a broad range of workpiece materials\u003c\/li\u003e\n  \u003cli\u003eOxide coating reduces friction and improves chip flow during tapping\u003c\/li\u003e\n  \u003cli\u003e4-flute design offers balanced cutting action and good chip clearance in short-chipping materials\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eSuitable for tapping 3\/8-16 UNC threads in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. Functions in standard tap holders, tapping heads, and hand tap wrenches that accept a straight shank with a 0.381-inch shank diameter.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThis tap is installed by a machinist or maintenance technician using a tap wrench, tapping fixture, or low-speed drill press with a tapping attachment. Always use an appropriate cutting fluid matched to the workpiece material to extend tool life and improve thread finish. Ensure the tap is started square to the hole to avoid thread misalignment or tap breakage. Follow applicable shop safety procedures and secure the workpiece firmly before beginning the tapping operation.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\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\u003eThreads per Inch\u003c\/strong\u003e: 16\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\u003eNumber of Flutes\u003c\/strong\u003e: 4\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChamfer Type\u003c\/strong\u003e: Taper\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2-15\/16 inches (2.937 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 1-1\/4 inches (0.937 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.381 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\u003eNeck Length\u003c\/strong\u003e: 1.4134 inches\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: Oxide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Application\u003c\/strong\u003e: Aluminum, Cast Aluminum, Cast Iron, Low-Carbon Steel, Medium-Carbon Steel, High-Carbon Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 101\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.073 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: 1121201\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51727527903538,"sku":"1121201","price":24.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/2774ec0fdba8ea4098f6462b12abfacf_714313f1-5f59-41c0-9381-d72a114a2f32.jpg?v=1788678905","url":"https:\/\/voomisupply.com\/products\/osg-1121201-straight-flute-tap-3-8-16-unc-hss-oxide","provider":"Voomi Supply","version":"1.0","type":"link"}