{"product_id":"osg-1662500-straight-flute-tap-5-8-11-unc-left-hand-hss","title":"Osg 1662500 Straight Flute Tap 5\/8-11 Unc Left Hand Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe OSG 1662500 is a straight flute tap designed to cut internal left-hand threads in a range of metals. Built from high-speed steel with a bright, uncoated finish, it produces 5\/8-11 UNC threads to a 3B class of fit with an H3 thread limit. The plug chamfer — typically 3 to 5 threads — makes this tap best suited for through-hole tapping applications where chip flow is not a primary constraint. With a 1-13\/16-inch thread length and a 3-13\/16-inch overall length, it fits standard tap handles and machine setups used by machinists and maintenance technicians in fabrication and industrial service environments.\u003c\/p\u003e\u003cp\u003eThis tap is intended for use in through-hole applications across a broad range of ferrous and non-ferrous workpiece materials. It cuts left-hand threads, making it the correct choice for applications where reverse-torque loading or counter-clockwise shaft rotation would cause a standard right-hand thread to loosen over time. Typical use cases include spindle components, turnbuckle hardware, and mechanical assemblies requiring left-hand fastening. The 5\/8-11 UNC thread form is a common coarse-pitch size used throughout industrial and structural applications.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eLeft-hand thread direction for counter-clockwise fastening applications\u003c\/li\u003e\n\u003cli\u003e5\/8-11 UNC thread form, 3B class of fit, H3 thread limit for controlled tolerance\u003c\/li\u003e\n\u003cli\u003ePlug chamfer (3-5 lead threads) optimized for through-hole tapping\u003c\/li\u003e\n\u003cli\u003eHigh-speed steel construction — suitable for aluminum, cast iron, and low-, medium-, and high-carbon steels\u003c\/li\u003e\n\u003cli\u003eBright, uncoated finish — no coating variables to account for during setup\u003c\/li\u003e\n\u003cli\u003e4 straight flutes with a 1-13\/16-inch thread length and no coolant-through requirement\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eCompatible workpiece materials include aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. This tap is part of the OSG Series 101L and is designed for standard through-hole tapping in manual tap handles or machine tapping setups accepting the 0.48-inch shank diameter.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis tap produces left-hand threads — confirm thread direction requirements before use, as it will not produce a usable thread in a right-hand-tapped hole. Secure the workpiece fully before starting; misalignment at entry will damage the tap and the hole. Use a tapping fluid or cutting oil appropriate to the workpiece material to extend tool life and improve thread quality. Follow your shop safety procedures for rotating or hand-driven cutting tools.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 5\/8-11 UNC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Direction\u003c\/strong\u003e: Left Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 4\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 Length\u003c\/strong\u003e: 1-13\/16 inches (1.362 inches decimal)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3-13\/16 inches (3.811 inches decimal)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.48 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSquare Length\u003c\/strong\u003e: 0.5625 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSquare Size\u003c\/strong\u003e: 0.36 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNeck Length\u003c\/strong\u003e: 2.0 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: 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\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Application\u003c\/strong\u003e: Aluminum, Cast Aluminum, Cast Iron, Low-Carbon Steel, Medium-Carbon Steel, High-Carbon Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 101L\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.192 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: OSG\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 1662500\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51728444260658,"sku":"1662500","price":77.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/41cafc0a20c3b375b27c503ddf66cbe3.jpg?v=1788691286","url":"https:\/\/voomisupply.com\/products\/osg-1662500-straight-flute-tap-5-8-11-unc-left-hand-hss","provider":"Voomi Supply","version":"1.0","type":"link"}