{"product_id":"osg-1136200-straight-flute-tap-1-8-unc-bottoming-hss","title":"Osg 1136200 Straight Flute Tap 1-8 Unc Bottoming Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe OSG 1136200 is a straight flute bottoming tap designed to cut 1-8 UNC internal threads in through-holes and blind holes where full thread depth is required close to the bottom. Built from high-speed steel with a bright uncoated finish, it carries a 3B class of fit and an H4 thread limit for consistent tolerance control. The 4-flute straight flute geometry provides chip support and stability during the tapping operation. Overall length is 5-1\/8 inches, thread length is 2-1\/2 inches, and the tool weighs 0.631 pounds. This tap is part of the OSG Series 101 product line and is intended for use by machinists and toolroom professionals.\u003c\/p\u003e\u003cp\u003eThis tap is suited for production and maintenance machining applications where 1-8 UNC bottoming threads are required. It performs in a range of ferrous and non-ferrous workpiece materials including aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. The bottoming chamfer makes it the correct choice when threading to the bottom of a blind hole after a taper or plug tap has started the thread. Right-hand thread direction matches standard UNC fastener convention.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eBottoming chamfer for threading close to the bottom of blind holes\u003c\/li\u003e\n\u003cli\u003e4 straight flutes for chip support and rigidity in short-chipping materials\u003c\/li\u003e\n\u003cli\u003eH4 thread limit for consistent 3B class of fit tolerance\u003c\/li\u003e\n\u003cli\u003eHigh-speed steel construction handles a broad range of workpiece materials\u003c\/li\u003e\n\u003cli\u003eBright uncoated finish suitable for use with cutting oil or tapping fluid\u003c\/li\u003e\n\u003cli\u003eRight-hand thread direction, no coolant-through requirement\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use in standard CNC machining centers, drill presses, and tapping machines configured for 1-8 UNC right-hand thread cutting in aluminum, cast iron, and carbon steel workpieces.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis tool is installed by machinists and toolroom technicians in compatible tap holders or tapping heads. Ensure the spindle is stopped and the machine is in a safe state before changing tooling. Use appropriate cutting fluid or tapping compound for the workpiece material to extend tool life and improve thread quality. Verify correct drill hole diameter for 1-8 UNC before tapping to maintain the specified class of fit.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1-8 UNC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThreads per Inch\u003c\/strong\u003e: 8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 4\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: 3B\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Limit\u003c\/strong\u003e: H4\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: 2-1\/2 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 5-1\/8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSquare Size\u003c\/strong\u003e: 0.6 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSquare Length\u003c\/strong\u003e: 0.8125 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNeck Length\u003c\/strong\u003e: 2.7247 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, 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: 0.631 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: 1136200\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51742724555058,"sku":"1136200","price":166.26,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/161907ba41d5d67cca2452c7f0cc87a9.jpg?v=1788839090","url":"https:\/\/voomisupply.com\/products\/osg-1136200-straight-flute-tap-1-8-unc-bottoming-hss","provider":"Voomi Supply","version":"1.0","type":"link"}