{"product_id":"guhring-9039400028450-thread-forming-tap-4-40-unc-tin","title":"Guhring 9039400028450 Thread Forming Tap 4-40 Unc Tin","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe GUHRING 9039400028450 is a thread forming tap designed for creating 4-40 UNC internal threads without cutting chips. It operates by displacing material rather than removing it, producing stronger threads with better surface finish than cut taps. Built from High-Speed Steel-E-CO (cobalt-enhanced HSS) and coated with Titanium Nitride (TiN) for extended tool life, this tap carries a modified bottoming chamfer with 2-3 chamfered threads for threading close to the bottom of a blind hole. Overall length is 1.882 inches with a thread limit of H4\/H5. It is sized for use in machining operations, toolroom work, and production threading applications by machinists and maintenance technicians.\u003c\/p\u003e\u003cp\u003eThis tap is suited for blind hole and through-hole threading in a range of workpiece materials including steel, stainless steel, cast iron, and non-ferrous metals. The modified bottoming chamfer allows threading closer to the bottom of a blind hole than a standard bottoming tap while still providing adequate lead-in. With a tapping depth of 0.709 inches and a thread length of 0.433 inches, it fits typical small-fastener applications in light fabrication, electronics enclosures, instrument panels, and precision assemblies. It belongs to the Guhring Series 3940 forming tap line.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eThread forming (chipless) design produces stronger threads by cold-working the material rather than cutting\u003c\/li\u003e\n\u003cli\u003eHigh-Speed Steel-E-CO (cobalt) construction improves heat and wear resistance over standard HSS\u003c\/li\u003e\n\u003cli\u003eTitanium Nitride (TiN) coating extends tool life and reduces friction during tapping\u003c\/li\u003e\n\u003cli\u003eModified bottoming chamfer (2-3 threads) enables threading close to the bottom of blind holes\u003c\/li\u003e\n\u003cli\u003e4 oil grooves support lubrication flow during the forming process\u003c\/li\u003e\n\u003cli\u003eRight-hand thread direction, Class of Fit 2BX, Thread Limit H4\/H5\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for 4-40 UNC thread forming in steel, stainless steel, cast iron, and non-ferrous metals. Suitable for both blind hole and through-hole applications where a chipless thread form is required.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThread forming taps require a correctly sized forming tap pilot hole, which is larger than a standard cut tap drill size — consult the appropriate forming tap drill chart for the specific material before use. Use a tapping fluid or cutting oil rated for the workpiece material to prevent galling, particularly in stainless steel. Secure the workpiece firmly and use a calibrated torque-controlled tapping arm or CNC rigid tapping cycle to avoid tap breakage in small diameters. This tool should be installed and operated by qualified machinists or maintenance technicians familiar with threading operations.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 4-40\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClass of Fit\u003c\/strong\u003e: 2BX\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Limit\u003c\/strong\u003e: H4\/H5\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: 2-3P\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: High-Speed Steel-E-CO (Cobalt HSS)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: Titanium Nitride (TiN)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 1.882 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 0.433 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapping Depth\u003c\/strong\u003e: 0.709 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.141 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSquare Size\u003c\/strong\u003e: 0.110 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOil Grooves\u003c\/strong\u003e: 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute by Diameter Ratio\u003c\/strong\u003e: 3xD\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: Steel, Stainless Steel, Cast Iron, Non-Ferrous Metal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 3940\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.04 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: GUHRING\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 9039400028450\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GUHRING","offers":[{"title":"Default Title","offer_id":51733779611954,"sku":"9039400028450","price":52.07,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/a13b7501b5282a2b0167324069c93194.jpg?v=1788759189","url":"https:\/\/voomisupply.com\/products\/guhring-9039400028450-thread-forming-tap-4-40-unc-tin","provider":"Voomi Supply","version":"1.0","type":"link"}