{"product_id":"osg-1430205-spiral-flute-tap-1-4-28-unf-tin-hss","title":"Osg 1430205 Spiral Flute Tap 1\/4-28 Unf Tin Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe OSG 1430205 is a spiral flute plug tap designed for cutting 1\/4-28 UNF internal threads in a range of ferrous and non-ferrous materials. Built from high-speed steel (HSS) with a titanium nitride (TiN) coating, it delivers extended tool life and reduced friction during the threading operation. The three right-hand spiral flutes pull chips up and out of the hole, making this tap well suited for blind-hole applications where chip evacuation is critical. With a 50-degree helix angle and an H3 thread limit, it holds tolerance to a 3B class of fit. Overall length is 2.5 inches with a thread length of 0.645 inches. This tool is installed by machinists, tool-and-die makers, and maintenance technicians working in production or job-shop environments.\u003c\/p\u003e\n\u003cp\u003eThis tap is appropriate for use in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. The plug chamfer — typically 3 to 5 threads of taper — requires a pre-drilled hole and is the standard choice for through-holes or blind holes with sufficient depth. It belongs to OSG Series 107, a line of general-purpose spiral flute taps suited for both manual and CNC tapping operations in light to medium production work.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e1\/4-28 UNF right-hand thread, H3 thread limit, 3B class of fit\u003c\/li\u003e\n  \u003cli\u003eThree right-hand spiral flutes at a 50-degree helix angle for upward chip evacuation in blind holes\u003c\/li\u003e\n  \u003cli\u003eTiN coating reduces friction and increases wear resistance compared to uncoated HSS\u003c\/li\u003e\n  \u003cli\u003ePlug chamfer provides smooth thread entry and is suitable for both through and blind-hole applications\u003c\/li\u003e\n  \u003cli\u003e2.5-inch overall length with 0.645-inch thread length and 0.255-inch shank diameter\u003c\/li\u003e\n  \u003cli\u003eNo coolant-through design; suitable for conventional flood or hand-applied cutting fluid\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a standard 1\/4-28 UNF spiral flute plug tap compatible with manual tap handles, tapping heads, and CNC rigid-tapping setups that accept a 0.255-inch shank diameter. Rated for use in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel per OSG Series 107 specifications.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eUse the correct tap drill size for a 1\/4-28 UNF thread before tapping; an undersized hole will overload the tap and risk breakage. Apply appropriate cutting fluid for the workpiece material — sulfurized oil for steel, a light petroleum-based fluid or kerosene for aluminum. When tapping on a CNC machine, confirm spindle RPM and feed rate match the tap pitch to avoid thread damage or breakage. Never reverse a broken tap in the hole without appropriate extraction tooling.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1\/4-28 UNF\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNF\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThreads per Inch\u003c\/strong\u003e: 28\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 3\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\u003eChamfer\u003c\/strong\u003e: Plug\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Limit\u003c\/strong\u003e: H3\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClass of Fit\u003c\/strong\u003e: 3B\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: TiN (Titanium Nitride)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2.5 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 0.645 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\u003eNeck Length\u003c\/strong\u003e: 1.7 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\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: 107\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.03 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: 1430205\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51728876306738,"sku":"1430205","price":49.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/c6e08cf5885d3f8dd528d5072d139634.jpg?v=1788697256","url":"https:\/\/voomisupply.com\/products\/osg-1430205-spiral-flute-tap-1-4-28-unf-tin-hss","provider":"Voomi Supply","version":"1.0","type":"link"}