{"product_id":"osg-1400128605-thread-forming-tap-1-4-28-unf-cobalt-tin","title":"Osg 1400128605 Thread Forming Tap 1\/4-28 Unf Cobalt Tin","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe OSG 1400128605 is a thread forming tap in the HY-PRO NRT series, designed for cold-forming internal 1\/4-28 UNF threads without cutting. Rather than removing material, it displaces it to produce stronger, work-hardened threads with no chips to clear. The modified bottoming chamfer — 2 to 2.5 thread pitches — allows threading close to the bottom of a blind hole. Built from cobalt high-speed steel with a TiN coating, this tap handles the heat and abrasion generated in demanding materials. The H6 thread limit ensures the formed threads fall within the upper range of standard tolerance, accommodating the slight spring-back that occurs after forming.\u003c\/p\u003e\n\u003cp\u003eThis tap is rated for blind hole threading in alloy steel, carbon steel, die steel, hardened steel, stainless steel, and aluminum. It is well suited to production machining and precision fabrication environments where thread quality, hole strength, and chip-free operation are priorities. At 2.5 inches overall length with a shank diameter of 0.255 inches and a square drive of 0.191 inches, it fits standard tapping heads and CNC rigid-tap toolholders used in machine shops and manufacturing facilities.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eThread forming (chipless) design strengthens threads by cold-working the material rather than cutting\u003c\/li\u003e\n  \u003cli\u003eModified bottoming chamfer (2 to 2.5P) for threading close to the bottom of blind holes\u003c\/li\u003e\n  \u003cli\u003eCobalt high-speed steel construction for elevated heat resistance in tough alloys and stainless steel\u003c\/li\u003e\n  \u003cli\u003eTiN coating reduces friction and extends tool life across high-volume tapping applications\u003c\/li\u003e\n  \u003cli\u003eH6 thread limit accommodates material spring-back for consistent UNF thread fit\u003c\/li\u003e\n  \u003cli\u003eRight-hand thread direction; no coolant-through requirement simplifies setup\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for blind hole threading in alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel (material application codes P and N). Fits standard tapping chucks and rigid-tap holders accepting a 0.255-inch shank with a 0.191-inch square drive.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThread forming taps require a specific forming tap drill size — do not use the same drill size as a cutting tap for the same thread. Secure the workpiece and ensure the tap is aligned axially to the hole before engagement. Use an appropriate tapping fluid or cutting oil rated for the workpiece material, particularly when working with stainless steel or hardened alloys. Follow machine shop safety practices and consult applicable OSHA standards for rotating tooling when operating in powered tapping equipment.\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\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\u003eChamfer\u003c\/strong\u003e: Modified Bottoming\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChamfered Threads\u003c\/strong\u003e: 2 to 2.5P\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: H6\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Cobalt High-Speed Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: TiN\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication\u003c\/strong\u003e: Blind Hole Threading\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Application\u003c\/strong\u003e: Alloy Steel, Aluminum, Carbon Steel, Die Steel, Hardened Steel, Stainless 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: 0.594 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTapping Depth\u003c\/strong\u003e: 0.933 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\u003eSquare Size\u003c\/strong\u003e: 0.191 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\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: HY-PRO NRT\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.034 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: 1400128605\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51747478176050,"sku":"1400128605","price":38.51,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/f9e0a7535aeb52c331c9ab34d6077839_8578d641-b4fd-489e-9f80-db3d56ded76f.jpg?v=1788881091","url":"https:\/\/voomisupply.com\/products\/osg-1400128605-thread-forming-tap-1-4-28-unf-cobalt-tin","provider":"Voomi Supply","version":"1.0","type":"link"}