{"product_id":"osg-1740805-spiral-point-tap-5-16-18-unc-tin-hss","title":"Osg 1740805 Spiral Point Tap 5\/16-18 Unc Tin Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe OSG 1740805 is a spiral point plug tap designed for threading 5\/16-18 UNC holes in a wide range of metallic workpiece materials. It features three flutes with a plug chamfer and is manufactured from Vanadium High Speed Steel (HSS-E) with a Titanium Nitride (TiN) coating for extended tool life and reduced friction. The H3 thread limit and 3B class of fit make it suitable for standard fastener applications requiring close tolerances. Right-hand cut, no coolant-through design. Overall length is 2.72 inches with a thread length of 0.665 inches (1-1\/8 inches nominal) and a shank diameter of 0.318 inches.\u003c\/p\u003e\u003cp\u003eThis tap is used in machine shop, maintenance, and production threading operations across industries including HVAC fabrication, plumbing, electrical enclosure work, and general mechanical assembly. It is suited for threading through-holes in aluminum, cast iron, low-, medium-, and high-carbon steel, alloy steel, die steel, stainless steel, and hardened steel. Spiral point geometry pushes chips forward ahead of the tap, making it most effective in through-hole applications rather than blind holes.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e5\/16-18 UNC thread form, H3 thread limit, 3B class of fit for standard tolerance applications\u003c\/li\u003e\n\u003cli\u003eVanadium High Speed Steel (HSS-E) construction for toughness in demanding materials\u003c\/li\u003e\n\u003cli\u003eTiN coating reduces friction and improves wear resistance for longer tool life\u003c\/li\u003e\n\u003cli\u003ePlug chamfer with spiral point geometry pushes chips forward — optimized for through-hole threading\u003c\/li\u003e\n\u003cli\u003eRight-hand cut, three flutes, no coolant-through requirement\u003c\/li\u003e\n\u003cli\u003eCompatible with a broad material range including stainless steel, alloy steel, cast iron, and aluminum\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for through-hole threading in aluminum, hardened steel, stainless steel, high-carbon steel, low-carbon steel, medium-carbon steel, alloy steel, die steel, and cast iron. OSG Series 320.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstall and operate this tap using a tapping machine, CNC machining center, or manual tap wrench appropriate for the shank diameter. Ensure the workpiece is securely fixtured before tapping. Apply a suitable cutting fluid for the workpiece material to optimize thread quality and tap life. Spiral point taps are intended for through-hole use — do not use in blind holes where chip evacuation is restricted.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 5\/16-18 UNC\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: 3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChamfer\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\u003eThread Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Vanadium High Speed Steel (HSS-E)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: TiN (Titanium Nitride)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2.72 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 0.665 inches (1-1\/8 inches nominal)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.318 inches\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\u003eInterrupted Thread\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.052 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 320\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\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: 1740805\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51735406215474,"sku":"1740805","price":51.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/827b7903cc52a70d2c4a527975547f08.jpg?v=1788772310","url":"https:\/\/voomisupply.com\/products\/osg-1740805-spiral-point-tap-5-16-18-unc-tin-hss","provider":"Voomi Supply","version":"1.0","type":"link"}