{"product_id":"osg-1120100-straight-flute-tap-1-4-20-unc-4-flutes-hss","title":"Osg 1120100 Straight Flute Tap 1\/4-20 Unc 4 Flutes Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe OSG 1120100 is a straight flute tap designed for cutting internal threads in a wide range of ferrous and non-ferrous materials. Built from high-speed steel with a bright, uncoated finish, this plug-chamfer tap produces a 1\/4-20 UNC right-hand thread to a 3B class of fit with an H3 thread limit. It features 4 flutes and a thread length of 1 inch within an overall length of 2.5 inches. The plug chamfer provides a gradual lead-in, making it suitable for both through-hole and moderately deep blind-hole applications. Licensed machinists, tool-and-die makers, HVAC fabricators, plumbers, and maintenance technicians commonly reach for this tap in production and repair work.\u003c\/p\u003e\n\u003cp\u003eThis tap is suited for tapping operations in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. Its straight flute geometry works well in through-holes and short chip-producing materials where flute evacuation is manageable. The 1\/4-20 UNC thread form is one of the most common fastener sizes in residential and light commercial mechanical and HVAC assemblies, making this tap a frequent shop and field tool.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e1\/4-20 UNC thread form, right-hand, 3B class of fit with H3 thread limit for consistent tolerance control\u003c\/li\u003e\n  \u003cli\u003e4 straight flutes for stability and cutting performance in short-chip materials\u003c\/li\u003e\n  \u003cli\u003ePlug chamfer (3-5 thread lead-in) suitable for through-holes and moderately deep blind holes\u003c\/li\u003e\n  \u003cli\u003eHigh-speed steel construction provides toughness across a broad range of workpiece materials\u003c\/li\u003e\n  \u003cli\u003eBright, uncoated finish  -  no additional coating buildup that could affect thread tolerance on close-fit applications\u003c\/li\u003e\n  \u003cli\u003eCompact 2.5-inch overall length fits standard tap handles and CNC tapping chucks\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel workpieces requiring a 1\/4-20 UNC internal thread to a 3B class of fit. Part of OSG Series 101.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eUse in a tap wrench, tapping stand, or CNC rigid-tapping setup with appropriate cutting fluid for the workpiece material. Ensure the tap is started perpendicular to the work surface to avoid cross-threading and tap breakage. For blind holes, track depth carefully to prevent bottoming out. Always secure the workpiece before tapping and follow applicable shop safety practices.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1\/4-20 UNC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 4\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Direction\u003c\/strong\u003e: Right Hand\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\u003eChamfer Type\u003c\/strong\u003e: Plug\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThreads per Inch\u003c\/strong\u003e: 20\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 1 inch (0.748 inches decimal)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2.5 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.255 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSquare Length\u003c\/strong\u003e: 0.3125 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSquare Size\u003c\/strong\u003e: 0.191 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNeck Length\u003c\/strong\u003e: 1.1811 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: 0.028 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: 1120100\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51742887215410,"sku":"1120100","price":19.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/9091e8239acf71b192b46b48e64073ea.jpg?v=1788840243","url":"https:\/\/voomisupply.com\/products\/osg-1120100-straight-flute-tap-1-4-20-unc-4-flutes-hss","provider":"Voomi Supply","version":"1.0","type":"link"}