{"product_id":"hertel-k008391as25-spiral-point-tap-5-16-18-unc-tin-hss","title":"Hertel K008391AS25 Spiral Point Tap 5\/16-18 Unc Tin Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HERTEL K008391AS25 is a spiral point tap designed for threading 5\/16-18 UNC through-holes in a wide range of materials. It features a plug chamfer, two flutes, and a TiN (titanium nitride) coating over a high-speed steel (HSS) body. The spiral point geometry pushes chips forward ahead of the tap rather than packing them in the flutes, making it well-suited for through-hole applications where chip evacuation is critical. The H3 thread limit provides consistent fit to a 3B class of fit tolerance. This tap is right-hand cut and is installed without coolant-through capability. Machinists, tool-and-die workers, and maintenance technicians use this tap in drill press, CNC, and hand-tapping operations.\u003c\/p\u003e\u003cp\u003eThis tap is appropriate for threading 5\/16-18 UNC through-holes in steel, aluminum, cast iron, and similar materials encountered in general manufacturing, maintenance and repair, and fabrication environments. The plug chamfer style requires a starter hole and is the standard choice when tapping through-holes where the tap can exit the opposite side. The TiN coating extends tool life by reducing friction and increasing surface hardness compared to uncoated HSS taps. It is well-suited for production runs as well as single-use maintenance applications in both shop and field settings.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eSpiral point geometry pushes chips forward for reliable through-hole tapping\u003c\/li\u003e\n\u003cli\u003eTiN coating reduces friction and extends tool life versus uncoated HSS\u003c\/li\u003e\n\u003cli\u003eHigh-speed steel construction handles a broad range of workpiece materials\u003c\/li\u003e\n\u003cli\u003ePlug chamfer for standard through-hole entry and full thread engagement\u003c\/li\u003e\n\u003cli\u003eH3 thread limit holds 3B class of fit tolerance for consistent thread quality\u003c\/li\u003e\n\u003cli\u003eRight-hand cut, no coolant-through required\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement or direct-use tap for 5\/16-18 UNC through-hole threading applications. Compatible with standard tap holders, drill presses, CNC tapping heads, and hand-tapping drivers that accept this shank size.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis tap is installed by licensed machinists or qualified maintenance technicians using a tap wrench, drill press, or CNC tapping attachment. Ensure the workpiece is securely clamped and the pilot hole is drilled to the correct tap drill diameter for 5\/16-18 UNC before beginning. Apply appropriate cutting fluid for the workpiece material to prevent galling and extend tap life. Reverse the tap periodically when hand-tapping to break chips and prevent tap breakage.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 5\/16-18\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\u003eChamfer Style\u003c\/strong\u003e: Plug\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: High-Speed Steel (HSS)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: TiN (Titanium Nitride)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOversize\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.65 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 23241600\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: HERTEL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: K008391AS25\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51748158964018,"sku":"K008391AS25","price":27.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/c008f82eedbea2e70f823e9eff084515.jpg?v=1788889780","url":"https:\/\/voomisupply.com\/products\/hertel-k008391as25-spiral-point-tap-5-16-18-unc-tin-hss","provider":"Voomi Supply","version":"1.0","type":"link"}