{"product_id":"osg-1824000-spiral-point-sti-tap-4-40-unc-2-flute-hss","title":"Osg 1824000 Spiral Point Sti Tap 4-40 Unc 2 Flute Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe OSG 1824000 is a spiral point STI tap designed for cutting 4-40 UNC threads in a plug chamfer style. Built from high-speed steel (HSS) with a bright, uncoated finish, this tap is suited for general-purpose tapping operations where an STI (Screw Thread Insert) thread form is required. The plug chamfer distributes cutting load gradually across the lead threads, making it appropriate for through-hole applications. At 1-7\/8 inches overall length with a 9\/16-inch thread length, this is a compact tool for use in small-diameter tapping work. Machinists, maintenance technicians, and toolroom professionals install this tap by hand or with a machine tapper in ferrous and non-ferrous materials.\u003c\/p\u003e\n\u003cp\u003eThis tap is used in applications requiring STI thread forms, typically to prepare holes that will accept Heli-Coil or similar wire thread inserts. The 4-40 UNC thread designation suits fine-thread, small-fastener work common in electronics assembly, instrument manufacturing, precision machining, and light mechanical repair. The spiral point geometry pushes chips forward ahead of the tap, making it effective in through-hole setups where chip evacuation is not obstructed. It is appropriate for both manual and low-speed machine tapping setups.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eSTI thread form for use with wire thread inserts such as Heli-Coil style inserts\u003c\/li\u003e\n  \u003cli\u003eSpiral point design pushes chips forward, optimized for through-hole tapping\u003c\/li\u003e\n  \u003cli\u003eHigh-speed steel construction provides durability across a range of workpiece materials\u003c\/li\u003e\n  \u003cli\u003ePlug chamfer distributes cutting load over several lead threads for controlled entry\u003c\/li\u003e\n  \u003cli\u003eH2 thread limit for close-tolerance thread production\u003c\/li\u003e\n  \u003cli\u003eBright, uncoated finish suitable for use with cutting fluid in general-purpose tapping\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or standard toolroom tap for applications requiring a 4-40 UNC STI thread form. Fits standard tap holders and wrenches sized for a 0.141-inch shank diameter.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by qualified machinists or maintenance technicians using a calibrated tap wrench or machine tapper. The workpiece must be secured and the correct STI drill size must be used before tapping to achieve proper thread engagement. Apply a suitable cutting fluid for the workpiece material to extend tool life and improve thread quality. Avoid forcing the tap or reversing too aggressively, as small-diameter taps are susceptible to breakage under side load.\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\u003eNumber of Flutes\u003c\/strong\u003e: 2\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChamfer Type\u003c\/strong\u003e: Plug\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Limit\u003c\/strong\u003e: H2\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\u003eOverall Length\u003c\/strong\u003e: 1-7\/8 inches (1.875 inches decimal)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 9\/16 inches (0.389 inches decimal)\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\u003eSeries\u003c\/strong\u003e: 125\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.011 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: 1824000\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51740968550706,"sku":"1824000","price":40.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/8888780ac9a53202d13dc51e3d1668a6.jpg?v=1788828668","url":"https:\/\/voomisupply.com\/products\/osg-1824000-spiral-point-sti-tap-4-40-unc-2-flute-hss","provider":"Voomi Supply","version":"1.0","type":"link"}