{"product_id":"osg-2940301-spiral-flute-tap-1-4-20-unc-modified-bottoming","title":"Osg 2940301 Spiral Flute Tap 1\/4-20 Unc Modified Bottoming","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe OSG 2940301 is a spiral flute tap designed for threading 1\/4-20 UNC holes in a wide range of ferrous materials. It features a 45-degree right-hand helix that pulls chips up and out of the hole during tapping, reducing the risk of chip packing in blind and semi-blind bores. The tap is ground from vanadium high-speed steel and finished with a steam oxide coating that improves lubricity and reduces galling. With a modified bottoming chamfer, this tap is suited for applications requiring threads close to the bottom of a blind hole. Machinists and toolroom professionals install this tap in CNC machining centers, manual mills, and drill presses.\u003c\/p\u003e\n\u003cp\u003eThis tap is suited for threading alloy steel, carbon steel, cast iron, stainless steel, die steel, and hardened steel workpieces. The modified bottoming chamfer makes it a practical choice when full thread depth near the bottom of a blind hole is required. The H11 thread limit designation indicates a controlled oversize grind appropriate for plated or close-tolerance threaded assemblies. At 2.5 inches overall length, the 2940301 fits standard 1\/4-inch tap holders used in production and job-shop environments.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e45-degree right-hand spiral flute evacuates chips from blind holes during cutting\u003c\/li\u003e\n  \u003cli\u003eModified bottoming chamfer allows threading close to the bottom of a blind bore\u003c\/li\u003e\n  \u003cli\u003eVanadium high-speed steel construction provides toughness and wear resistance in ferrous materials\u003c\/li\u003e\n  \u003cli\u003eSteam oxide coating reduces friction and improves chip flow\u003c\/li\u003e\n  \u003cli\u003eH11 thread limit with oversize grind for use with plated or tolerance-critical assemblies\u003c\/li\u003e\n  \u003cli\u003eRight-hand thread direction, 1\/4-20 UNC, 3 flutes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for cutting 1\/4-20 UNC internal threads in alloy steel, carbon steel, cast iron, stainless steel, die steel, and hardened steel. Part of the OSG Series 290 spiral flute tap line.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThis tap should be installed by a machinist or toolroom technician using a properly sized tap holder or floating collet chuck. Always apply appropriate cutting fluid for the workpiece material before tapping, and ensure the tap is aligned perpendicular to the workpiece surface to avoid thread lean or tap breakage. Power down the machine spindle and secure the workpiece before changing or inspecting the tap. Do not force a worn tap — replace it when torque increases noticeably or thread quality degrades.\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\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: 20\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\u003eFlute Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChamfer\u003c\/strong\u003e: Modified Bottoming\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Limit\u003c\/strong\u003e: H11\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOversize\u003c\/strong\u003e: Yes\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: Steam Oxide\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\u003eOverall Length\u003c\/strong\u003e: 2.5 inches\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\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNeck Length\u003c\/strong\u003e: 0.996 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\u003eSeries\u003c\/strong\u003e: 290\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: 2940301\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51737674154290,"sku":"2940301","price":48.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/d85c37dd0792b2f0426778fd961d64a7.jpg?v=1788792173","url":"https:\/\/voomisupply.com\/products\/osg-2940301-spiral-flute-tap-1-4-20-unc-modified-bottoming","provider":"Voomi Supply","version":"1.0","type":"link"}