{"product_id":"osg-2930300-spiral-flute-tap-1-4-28-unf-3-flute","title":"Osg 2930300 Spiral Flute Tap 1\/4-28 Unf 3 Flute","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe OSG 2930300 is a spiral flute tap designed for cutting internal 1\/4-28 UNF right-hand threads in a range of ferrous materials. Built from vanadium high-speed steel with a bright uncoated finish, this tap features a 45-degree helix angle that promotes efficient chip evacuation in blind-hole applications. The modified bottoming chamfer allows threading close to the bottom of a hole while still providing enough lead-in to start cleanly. It is sized at 2.5 inches overall length with a 0.255-inch shank diameter. Machinists, tool-and-die makers, and maintenance technicians working on precision assemblies are the typical users.\u003c\/p\u003e\n\u003cp\u003eThis tap is suited for production and maintenance threading operations in alloy steel, carbon steel, cast iron, stainless steel, die steel, and hardened steel. The spiral flute design is especially effective in blind-hole setups where chip packing is a concern. It carries an H2 thread limit, making it appropriate for standard UNF tolerance fits commonly required in hydraulic fittings, fastener repairs, and precision mechanical assemblies.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e45-degree helix angle for positive chip ejection in blind holes\u003c\/li\u003e\n  \u003cli\u003eModified bottoming chamfer allows threading close to hole bottom\u003c\/li\u003e\n  \u003cli\u003eVanadium high-speed steel construction for wear resistance across ferrous materials\u003c\/li\u003e\n  \u003cli\u003eH2 thread limit for consistent UNF tolerance control\u003c\/li\u003e\n  \u003cli\u003eBright uncoated finish suitable for use with standard cutting fluids\u003c\/li\u003e\n  \u003cli\u003eRight-hand flute direction and right-hand thread for standard CW tapping\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for cutting 1\/4-28 UNF internal threads in alloy steel, carbon steel, cast iron, stainless steel, die steel, and hardened steel workpieces. Coolant-through is not supported on this tap.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstall in a tapping chuck or rigid tap holder appropriate for the shank diameter. Always power down or de-energize CNC equipment and clear the work area before tool changes. Use an appropriate cutting fluid or tapping compound for the workpiece material to extend tool life and improve thread finish. Follow shop-standard speeds and feeds for high-speed steel taps; do not exceed the tap's rated hardness range for the workpiece material.\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\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\u003eHelix Angle\u003c\/strong\u003e: 45 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChamfer\u003c\/strong\u003e: Modified Bottoming\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Limit\u003c\/strong\u003e: H2\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThreads per Inch\u003c\/strong\u003e: 28\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2.5 inches (85.7 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 0.397 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.255 inches (9.3218 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNeck Length\u003c\/strong\u003e: 49.1 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSquare Length\u003c\/strong\u003e: 0.3125 inches (11.1125 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSquare Size\u003c\/strong\u003e: 0.191 inches (6.985 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Vanadium 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: Alloy Steel, Carbon Steel, Cast Iron, Stainless Steel, Die Steel, Hardened Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.04 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: 2930300\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51746689515826,"sku":"2930300","price":47.43,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/b19c66b021f62948da2294eeb1b6e661.jpg?v=1788872793","url":"https:\/\/voomisupply.com\/products\/osg-2930300-spiral-flute-tap-1-4-28-unf-3-flute","provider":"Voomi Supply","version":"1.0","type":"link"}