{"product_id":"osg-1650502508-spiral-flute-tap-3-8-16-unc-ticn-coated","title":"Osg 1650502508 Spiral Flute Tap 3\/8-16 Unc Ticn Coated","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe OSG 1650502508 is a spiral flute tap designed for threading 3\/8-16 UNC holes in a wide range of metallic workpiece materials. Built from powdered metal (grade PMT15) with a TICN coating and a 45-degree helix angle, this tap evacuates chips upward out of the hole, making it well suited for blind-hole tapping applications. The modified bottoming chamfer allows threading close to the bottom of a blind hole while still providing enough lead-in for controlled entry. It produces a Class 3B fit with an H3 thread limit, meeting the precision requirements typical in structural and mechanical fastening applications. Licensed machinists, tool-and-die makers, and maintenance technicians working in a shop or field environment are the primary users.\u003c\/p\u003e\n\u003cp\u003eThis tap is rated for use in alloy steel, aluminum, cast aluminum, cast iron, hardened steel, high-carbon steel, low-carbon steel, medium-carbon steel, and stainless steel. The 45-degree spiral flute geometry is particularly effective in interrupted cuts and gummy materials such as aluminum and stainless steel where straight-flute taps tend to pack chips. It is sized for standard 3\/8-16 UNC through or blind holes and fits the OSG Series 16505 product family. Thread length is 0.5 inches (12.7 mm) and overall length is 100 mm. Right-hand thread direction matches standard fastener convention.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e45-degree helix angle spiral flute design evacuates chips upward, ideal for blind-hole tapping\u003c\/li\u003e\n  \u003cli\u003eModified bottoming chamfer enables threading near the bottom of a blind hole\u003c\/li\u003e\n  \u003cli\u003eTICN coating improves wear resistance and reduces friction across a broad range of workpiece materials\u003c\/li\u003e\n  \u003cli\u003ePowdered metal construction (grade PMT15) provides consistent hardness and toughness compared to standard HSS\u003c\/li\u003e\n  \u003cli\u003eH3 thread limit and Class 3B fit deliver precision threading for structural and mechanical fastener applications\u003c\/li\u003e\n  \u003cli\u003eRated for nine workpiece materials including stainless steel, cast iron, and hardened steel\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use in 3\/8-16 UNC threaded hole applications across alloy steel, aluminum, cast aluminum, cast iron, hardened steel, high-carbon steel, low-carbon steel, medium-carbon steel, and stainless steel workpieces. Part of the OSG Series 16505 spiral flute tap family.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThis tap is installed by machinists or maintenance technicians using a tapping machine, drill press, or CNC machining center with a properly sized tap holder. Always ensure the pilot hole diameter matches the recommended tap drill size for 3\/8-16 UNC before tapping. Use an appropriate cutting fluid matched to the workpiece material — sulfurized oil for steel, lubricant-based fluid for aluminum — to extend tool life and improve thread quality. Inspect the tap for chipping or wear before each use, particularly when working in hardened steel.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 3\/8-16 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\u003eFlute Style\u003c\/strong\u003e: 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: 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\u003eThreads per Inch\u003c\/strong\u003e: 16\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 0.5 inches (12.7 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 100 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.381 inches (9.68 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNeck Length\u003c\/strong\u003e: 39 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTapping Depth\u003c\/strong\u003e: 39 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSquare Length\u003c\/strong\u003e: 0.4375 inches (11.11 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSquare Size\u003c\/strong\u003e: 0.286 inches (7.26 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Powdered Metal (PMT15)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: TICN\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: 16505\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.105 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Application\u003c\/strong\u003e: Alloy Steel, Aluminum, Cast Aluminum, Cast Iron, Hardened Steel, High-Carbon Steel, Low-Carbon Steel, Medium-Carbon Steel, Stainless Steel\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: 1650502508\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51732363247922,"sku":"1650502508","price":69.85,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/9ea6e5d1672b36f162288ea71676120d.jpg?v=1788742086","url":"https:\/\/voomisupply.com\/products\/osg-1650502508-spiral-flute-tap-3-8-16-unc-ticn-coated","provider":"Voomi Supply","version":"1.0","type":"link"}