{"product_id":"osg-1181400-straight-flute-tap-3-8-16-unc-bottoming-hss","title":"Osg 1181400 Straight Flute Tap 3\/8-16 Unc Bottoming Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe OSG 1181400 is a straight flute bottoming tap designed to cut 3\/8-16 UNC internal threads in blind and through holes where full thread depth is required close to the bottom. Made from high-speed steel with a bright, uncoated finish, it runs 3 flutes and is ground to an H5 thread limit with a 2B class of fit. Overall length is 2-15\/16 inches with a 1-1\/4 inch thread length, making it a standard-length tap suited to hand tapping and machine tapping setups. Machinists, maintenance technicians, and tool-and-die professionals specify this tap for production and repair threading operations.\u003c\/p\u003e\u003cp\u003eThis tap is intended for threading ferrous and non-ferrous materials including low-carbon steel, medium-carbon steel, high-carbon steel, cast iron, aluminum, and cast aluminum. The bottoming chamfer configuration  -  typically 1 to 2 threads of lead  -  allows the tap to thread as close to the bottom of a blind hole as possible after a taper or plug tap has started the thread. It belongs to OSG Series 103, a straight flute line suited to short-chipping materials where flute geometry assists chip control without spiral extraction.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eBottoming chamfer for maximum thread depth in blind holes\u003c\/li\u003e\n\u003cli\u003e3 straight flutes for use in short-chipping materials such as cast iron and aluminum\u003c\/li\u003e\n\u003cli\u003eH5 thread limit provides a controlled oversize tolerance appropriate for 2B class fits\u003c\/li\u003e\n\u003cli\u003eHigh-speed steel construction delivers durability across a wide range of workpiece materials\u003c\/li\u003e\n\u003cli\u003eBright, uncoated finish compatible with standard cutting fluids and oils\u003c\/li\u003e\n\u003cli\u003eRight-hand thread direction, no coolant-through feature\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard replacement or production tap for 3\/8-16 UNC threading applications in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel workpieces.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis tap should be installed and operated by a qualified machinist or maintenance technician following standard threading practices. Always secure the workpiece and use appropriate cutting fluid or tapping oil for the material being threaded. Power down or de-energize any machine tool before changing tooling. Follow applicable shop safety standards and manufacturer torque guidelines for the tapping equipment in use.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 3\/8-16\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\u003eChamfer\u003c\/strong\u003e: 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\u003eThread Length\u003c\/strong\u003e: 1-1\/4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2-15\/16 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: Bright\/Uncoated\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, High-Carbon Steel, Low-Carbon Steel, Medium-Carbon Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 103\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.07 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: 1181400\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51740110389554,"sku":"1181400","price":31.08,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/98e66e8c2137554d6a9a3ebf1698d6b5.jpg?v=1788822376","url":"https:\/\/voomisupply.com\/products\/osg-1181400-straight-flute-tap-3-8-16-unc-bottoming-hss","provider":"Voomi Supply","version":"1.0","type":"link"}