{"product_id":"guhring-9039310063500-spiral-flute-tap-1-4-20-unc","title":"Guhring 9039310063500 Spiral Flute Tap 1\/4-20 Unc","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe GUHRING 9039310063500 is a spiral flute tap designed for cutting 1\/4-20 UNC internal threads in blind holes. Built from cobalt high-speed steel with a bright, uncoated finish, this tap runs a 45-degree helix angle that evacuates chips efficiently during cutting. The modified bottoming chamfer allows threading close to the bottom of a blind hole while maintaining chamfer strength. At 2.5 inches overall length, it fits standard tapping chucks and CNC rigid-tap toolholders used in production and maintenance environments. Machining professionals and toolroom technicians reach for this tap when thread quality and chip control in confined holes are the priority.\u003c\/p\u003e\n\u003cp\u003eThis tap is rated for use in aluminum and aluminum alloy workpieces, where its fast-flute spiral geometry and cobalt substrate perform reliably at production cutting speeds. The 2B class of fit covers the vast majority of general-purpose threaded fastener assemblies. With a thread limit of H4 and H5, it produces threads within tolerance for standard 1\/4-20 UNC mating hardware. It is a solid choice for blind-hole threading operations on CNC machining centers, knee mills, or drill presses equipped with a tapping attachment.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e1\/4-20 UNC thread form, right-hand thread, right-hand flute\u003c\/li\u003e\n  \u003cli\u003eModified bottoming chamfer for threading close to the bottom of blind holes\u003c\/li\u003e\n  \u003cli\u003e45-degree helix angle promotes upward chip evacuation in blind holes\u003c\/li\u003e\n  \u003cli\u003eCobalt high-speed steel construction for heat and wear resistance\u003c\/li\u003e\n  \u003cli\u003e2B class of fit with H4 and H5 thread limits\u003c\/li\u003e\n  \u003cli\u003eBright, uncoated finish suitable for aluminum and aluminum alloy applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for blind-hole threading in aluminum and aluminum alloy workpieces. Compatible with standard tapping chucks and toolholders accepting a 0.255-inch shank diameter. Rated for 1\/4-20 UNC 2B thread assemblies per ASME B1.1 tolerance standards.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eSpiral flute taps are installed and operated by machinists and toolroom technicians. Before tapping, ensure the workpiece is securely fixtured and the spindle is aligned with the pre-drilled hole. Use appropriate tapping fluid or cutting oil for aluminum to extend tool life and maintain thread quality. When using a CNC machining center, enable rigid tapping mode and match spindle feed rate exactly to the 20 threads-per-inch pitch to avoid tap breakage.\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\u003eNumber of Flutes\u003c\/strong\u003e: 2\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Style\u003c\/strong\u003e: Fast 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\u003eClass of Fit\u003c\/strong\u003e: 2B\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Limit\u003c\/strong\u003e: H4, H5\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\u003eApplication\u003c\/strong\u003e: Blind Hole Threading\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Application\u003c\/strong\u003e: Aluminum, Aluminum Alloy\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\/Finish\u003c\/strong\u003e: Bright\/Uncoated\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2.5 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: 1.181 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\u003eThreads per Inch\u003c\/strong\u003e: 20\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: 3931\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.08 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: GUHRING\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 9039310063500\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GUHRING","offers":[{"title":"Default Title","offer_id":51738292191538,"sku":"9039310063500","price":42.12,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/612f8df0f065747b5579d18fa8d09770.jpg?v=1788797817","url":"https:\/\/voomisupply.com\/products\/guhring-9039310063500-spiral-flute-tap-1-4-20-unc","provider":"Voomi Supply","version":"1.0","type":"link"}