{"product_id":"osg-1136105-straight-flute-tap-1-8-unc-plug-3b-tin-hss","title":"Osg 1136105 Straight Flute Tap 1-8 Unc Plug 3B Tin Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe OSG 1136105 is a straight flute tap designed to cut 1-8 UNC internal threads in a wide range of ferrous and non-ferrous workpiece materials. Built from high-speed steel (HSS) and finished with a titanium nitride (TiN) coating, it delivers extended tool life and reduced friction during tapping operations. The plug chamfer on the leading end — typically 3 to 5 threads — allows entry in through-holes and semi-blind applications. With a thread limit of H4 and a 3B class of fit, this tap produces threads with the tolerance range required for general-purpose fastener assemblies. Machinists and maintenance technicians working in job shops, production environments, or MRO applications will find this tap suited to standard CNC and manual tapping setups.\u003c\/p\u003e\u003cp\u003eThis tap is designed for use in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. The 1-8 UNC designation makes it appropriate for tapping holes that accept large-diameter unified coarse-pitch fasteners commonly found in structural, mechanical, and industrial assemblies. The straight flute design works best in through-hole and short blind-hole applications where chips can fall away freely from the cutting zone. It is part of OSG Series 101, a line of standard-geometry HSS taps for general-purpose threading work.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e1-8 UNC thread form with right-hand thread direction for standard fastener compatibility\u003c\/li\u003e\n\u003cli\u003eTiN coating extends cutting edge life and reduces built-up edge on aluminum and steel\u003c\/li\u003e\n\u003cli\u003ePlug chamfer (3-5 thread lead) suits through-hole and semi-blind tapping\u003c\/li\u003e\n\u003cli\u003e3B class of fit and H4 thread limit for general-purpose tolerance control\u003c\/li\u003e\n\u003cli\u003e4 straight flutes for chip clearance in short to medium blind-hole depths\u003c\/li\u003e\n\u003cli\u003eCoolant-through feature not required — compatible with flood or manual lubrication\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eRated for use in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel workpieces. This tap is an OSG Series 101 standard-geometry HSS tap intended for general-purpose 1-8 UNC thread production on compatible CNC machining centers, drill presses, and tapping machines with appropriate tap holders.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a qualified machinist familiar with tapping speeds, feeds, and proper tap holder selection for the machine type in use. Always ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill diameter for a 1-8 UNC thread before beginning the tapping cycle. Use a cutting fluid or tapping compound appropriate for the workpiece material to prevent galling and premature tool wear. Inspect the tap for wear or chipping before each use and replace if thread quality degrades.\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 Type\u003c\/strong\u003e: Plug\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 (OAL)\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 (HSS)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: Titanium Nitride (TiN)\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: 0.63 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: 1136105\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51730096750898,"sku":"1136105","price":205.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/326d7ab8b02d8071a42bd324ef4f1ff7_bd99cccc-c908-4f3e-9f7d-8b76cd2522a1.jpg?v=1788711699","url":"https:\/\/voomisupply.com\/products\/osg-1136105-straight-flute-tap-1-8-unc-plug-3b-tin-hss","provider":"Voomi Supply","version":"1.0","type":"link"}