{"product_id":"osg-1661100-straight-flute-tap-3-8-24-unf-left-hand-hss","title":"Osg 1661100 Straight Flute Tap 3\/8-24 Unf Left Hand Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe OSG 1661100 is a straight flute tap designed to cut left-hand internal threads in a range of ferrous and non-ferrous materials. Built from high-speed steel with a bright\/uncoated finish, it produces 3\/8-24 UNF threads to a 3B class of fit with an H3 thread limit. The plug chamfer style  -  with approximately 3 to 5 threads of lead  -  makes it well-suited for through-hole tapping applications where the tap can advance past the full thread depth. With 4 flutes and a 1-1\/4 inch thread length, this tap delivers clean thread formation while chips clear along the straight flute geometry. It is part of the OSG 101L series.\u003c\/p\u003e\n\u003cp\u003eThis tap is intended for production and maintenance tapping of through holes in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. The left-hand thread direction makes it a specific-application tool used when the assembly design requires a thread that resists counterclockwise loosening forces, or when a left-hand fastener is specified by the engineer. It is commonly used by machinists, tool and die makers, and maintenance technicians working on mechanical assemblies, fixtures, and equipment repair.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eLeft-hand thread direction for assemblies requiring reverse-thread fasteners\u003c\/li\u003e\n  \u003cli\u003e3\/8-24 UNF thread form with 3B class of fit and H3 thread limit for precise tolerance control\u003c\/li\u003e\n  \u003cli\u003ePlug chamfer with 4 straight flutes optimized for through-hole tapping\u003c\/li\u003e\n  \u003cli\u003eHigh-speed steel construction suitable for a broad range of ferrous and non-ferrous workpiece materials\u003c\/li\u003e\n  \u003cli\u003eBright\/uncoated finish compatible with standard cutting fluids and tapping compounds\u003c\/li\u003e\n  \u003cli\u003eNo coolant-through design  -  standard setup with external lubrication or flood coolant\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for tapping 3\/8-24 UNF left-hand through holes in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel workpieces. Part of the OSG 101L series.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstall in a tapping head, CNC machine, or hand tap wrench sized for the shank diameter of 0.381 inches. Always apply an appropriate cutting fluid or tapping compound for the workpiece material before and during tapping. Secure the workpiece firmly and ensure the tap is aligned perpendicular to the hole before starting the thread. For left-hand taps, verify the spindle or wrench rotation direction is reversed relative to standard right-hand tapping.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 3\/8-24 UNF\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNF\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThreads per Inch\u003c\/strong\u003e: 24\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Direction\u003c\/strong\u003e: Left Hand\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\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\u003eThread Length\u003c\/strong\u003e: 1-1\/4 inches (0.937 inches decimal)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2-15\/16 inches (2.937 inches decimal)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNeck Length\u003c\/strong\u003e: 1.413 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.381 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSquare Length\u003c\/strong\u003e: 0.4375 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSquare Size\u003c\/strong\u003e: 0.286 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\u003eSeries\u003c\/strong\u003e: 101L\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.072 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: OSG\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 1661100\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51742464868658,"sku":"1661100","price":31.12,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/f83307d6c0e284b4b407e5a7774a56b3.jpg?v=1788837652","url":"https:\/\/voomisupply.com\/products\/osg-1661100-straight-flute-tap-3-8-24-unf-left-hand-hss","provider":"Voomi Supply","version":"1.0","type":"link"}