{"product_id":"osg-1732708-spiral-flute-tap-1-4-28-unf-modified-bottoming","title":"Osg 1732708 Spiral Flute Tap 1\/4-28 Unf Modified Bottoming","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe OSG 1732708 is a spiral flute tap designed for cutting internal right-hand threads to the 1\/4-28 UNF standard. Built from vanadium high-speed steel with a TICN coating, this tap delivers extended tool life in demanding applications. The modified bottoming chamfer allows threading closer to the bottom of blind holes compared to standard taper or plug chamfers. With a 45-degree helix angle and three flutes, it efficiently evacuates chips upward during cutting, making it well-suited for interrupted cuts and through-hole or shallow blind-hole work. The H3 thread limit and 3B class of fit ensure precise, consistent thread geometry on every pass.\u003c\/p\u003e\n\u003cp\u003eThis tap is intended for use in stainless steel, high-carbon steel, low-carbon steel, and medium-carbon steel workpieces. The TICN coating reduces friction and heat buildup, which is especially beneficial when threading stainless steel. It is part of OSG EXOTAP VA3 Series 303, a line engineered for high-performance tapping in production and maintenance machining environments. Machinists and tool-and-die tradespeople use this tap in CNC machining centers, drill presses, and manual tapping applications where a 1\/4-28 UNF thread is required.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e45-degree right-hand spiral flute design evacuates chips upward for cleaner blind-hole threading\u003c\/li\u003e\n  \u003cli\u003eModified bottoming chamfer allows threading to within a few threads of the hole bottom\u003c\/li\u003e\n  \u003cli\u003eTICN coating reduces friction and heat, extending tool life in ferrous materials\u003c\/li\u003e\n  \u003cli\u003eVanadium high-speed steel construction provides toughness and wear resistance\u003c\/li\u003e\n  \u003cli\u003eH3 thread limit with 3B class of fit ensures consistent, accurate thread production\u003c\/li\u003e\n  \u003cli\u003eNo coolant-through requirement simplifies setup in standard tapping operations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for cutting 1\/4-28 UNF right-hand internal threads in stainless steel, high-carbon steel, low-carbon steel, and medium-carbon steel. Part of the OSG EXOTAP VA3 Series 303.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThis tap should be installed in a tap holder or floating collet sized for the 0.381-inch shank diameter. Power down or de-energize any CNC or power tapping equipment before changing tooling. Use appropriate cutting fluid for the workpiece material, particularly when threading stainless steel, to reduce work hardening and galling. Dispose of metal chips per standard shop safety practices and inspect thread form periodically with a 3B go\/no-go gauge.\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: 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\u003eClass of Fit\u003c\/strong\u003e: 3B\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Limit\u003c\/strong\u003e: H3\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\u003c\/strong\u003e: TICN\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Application\u003c\/strong\u003e: Stainless Steel, High-Carbon Steel, Low-Carbon Steel, Medium-Carbon Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2.938 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 0.398 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.381 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNeck Length\u003c\/strong\u003e: 1.252 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\u003eWeight\u003c\/strong\u003e: 0.03 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: EXOTAP VA3 Series 303\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: 1732708\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51728729342258,"sku":"1732708","price":54.11,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/58471aad7f550f578cde946b9f809ac7.jpg?v=1788695557","url":"https:\/\/voomisupply.com\/products\/osg-1732708-spiral-flute-tap-1-4-28-unf-modified-bottoming","provider":"Voomi Supply","version":"1.0","type":"link"}