{"product_id":"osg-1406401-spiral-flute-tap-4-40-unc-plug-hss","title":"Osg 1406401 Spiral Flute Tap 4-40 Unc Plug Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe OSG 1406401 is a spiral flute tap designed for cutting 4-40 UNC internal threads in a wide range of ferrous and non-ferrous metals. Built from high-speed steel with a steam oxide coating, it features a plug chamfer and a 50-degree helix angle that evacuates chips efficiently in through-hole and blind-hole applications. The H2 thread limit holds tight tolerances for 2B and 3B class-of-fit threads. At 1.875 inches overall length and a shank diameter of 0.141 inches, it fits standard tap holders and machine spindles used by machinists, tool-and-die makers, and maintenance technicians across industrial and commercial settings.\u003c\/p\u003e\n\u003cp\u003eThis tap is suited for threading operations in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. The right-hand spiral flute pulls chips up and out of the hole, making it particularly effective in CNC tapping cycles and hand-tapping setups where chip management is a concern. The plug chamfer provides a gradual thread lead-in, distributing cutting load across the first several threads rather than concentrating it at the tip.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e4-40 UNC thread form with H2 thread limit for 2B and 3B class-of-fit tolerance control\u003c\/li\u003e\n  \u003cli\u003e50-degree right-hand helix angle promotes upward chip evacuation in blind and through holes\u003c\/li\u003e\n  \u003cli\u003eSteam oxide coating reduces friction and improves lubrication retention during cutting\u003c\/li\u003e\n  \u003cli\u003eHigh-speed steel construction provides durability across a broad range of workpiece materials\u003c\/li\u003e\n  \u003cli\u003ePlug chamfer distributes cutting forces over multiple threads for controlled thread lead-in\u003c\/li\u003e\n  \u003cli\u003eCompact 1.875-inch overall length fits standard tap chucks and quick-change holders\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 4-40 UNC threads at 2B or 3B class of fit.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by machinists or maintenance technicians using a tap wrench, tapping head, or CNC rigid-tapping spindle. Secure the workpiece firmly before starting and align the tap perpendicular to the hole to avoid thread misalignment or tap breakage. Apply a suitable cutting fluid or tapping compound for the workpiece material before and during the operation. Reverse the tap periodically when hand-tapping to break chips and prevent binding.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 4-40\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: 40\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClass of Fit\u003c\/strong\u003e: 2B, 3B\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Limit\u003c\/strong\u003e: H2\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChamfer\u003c\/strong\u003e: Plug\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 2\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Style\u003c\/strong\u003e: Spiral\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHelix Angle\u003c\/strong\u003e: 50 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: High-Speed Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: Steam Oxide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 1.875 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 0.326 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNeck Length\u003c\/strong\u003e: 0.535 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.141 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSquare Length\u003c\/strong\u003e: 0.1875 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSquare Size\u003c\/strong\u003e: 0.11 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 107\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.015 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: 1406401\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51740654829874,"sku":"1406401","price":49.32,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/a329f5903e97b9405a5c11a640e5aeb4.jpg?v=1788826503","url":"https:\/\/voomisupply.com\/products\/osg-1406401-spiral-flute-tap-4-40-unc-plug-hss","provider":"Voomi Supply","version":"1.0","type":"link"}