{"product_id":"osg-1012205-straight-flute-tap-4-40-unc-hss-tin","title":"Osg 1012205 Straight Flute Tap 4-40 Unc Hss Tin","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe OSG 1012205 is a straight flute tap designed to cut 4-40 UNC internal threads in a range of ferrous and non-ferrous materials. Built from high-speed steel (HSS) with a titanium nitride (TiN) coating, this tap delivers improved wear resistance and reduced friction compared to uncoated HSS tooling. It features a plug chamfer, which distributes cutting load across the first several threads for smooth thread entry. With a 3-flute design and right-hand thread direction, the 1012205 suits production and maintenance threading operations. Overall length is 1-7\/8 inches with a thread length of 9\/16 inches. Machinists, tool-and-die technicians, and maintenance mechanics install this tap in manual or CNC tapping setups.\u003c\/p\u003e\u003cp\u003eThe 1012205 is suited for threading operations in aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel workpieces. The 4-40 UNC thread size is common in small fastener applications across electronics assembly, instrumentation, and light mechanical fabrication. The plug chamfer style makes this tap appropriate for through-hole threading where moderate lead-in is acceptable. It carries a 2B class of fit, the standard tolerance class for general-purpose inch-series internal threads, and an H2 thread limit for consistent dimensional control.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e4-40 UNC thread form at 40 threads per inch with right-hand thread direction\u003c\/li\u003e\n\u003cli\u003ePlug chamfer distributes cutting load for smooth, controlled thread entry\u003c\/li\u003e\n\u003cli\u003eTiN coating improves surface hardness and reduces built-up edge in ferrous and aluminum materials\u003c\/li\u003e\n\u003cli\u003eHSS construction provides toughness for hand tapping and low-speed machine tapping\u003c\/li\u003e\n\u003cli\u003eH2 thread limit and 2B class of fit for general-purpose dimensional accuracy\u003c\/li\u003e\n\u003cli\u003e3-flute geometry supports chip clearance in through-hole applications\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use in through-hole tapping applications requiring 4-40 UNC internal threads at a 2B class of fit. Compatible materials include aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel as specified by the manufacturer.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis tap is installed by machinists and maintenance technicians using a tap wrench, tapping head, or CNC rigid tapping cycle. Before use, ensure the workpiece is secured and the pilot hole diameter matches the recommended tap drill size for 4-40 UNC. Apply appropriate cutting fluid for the workpiece material to extend tool life and improve thread finish. Reverse the tap periodically when hand tapping in harder materials to break chips and reduce the risk of tap breakage.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 4-40 UNC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThreads per Inch\u003c\/strong\u003e: 40\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChamfer Type\u003c\/strong\u003e: Plug\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClass of Fit\u003c\/strong\u003e: 2B\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Limit\u003c\/strong\u003e: H2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 9\/16 inches (0.370 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 1-7\/8 inches (1.874 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.141 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSquare Size\u003c\/strong\u003e: 0.11 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSquare Length\u003c\/strong\u003e: 0.1875 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNeck Length\u003c\/strong\u003e: 0.6811 inches\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: Titanium Nitride (TiN)\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, High-Carbon Steel, Low-Carbon Steel, Medium-Carbon Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 102\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.01 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: 1012205\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51747679961394,"sku":"1012205","price":24.21,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/f6a1d9914a8f580ef9fdc702954d74a3.jpg?v=1788884440","url":"https:\/\/voomisupply.com\/products\/osg-1012205-straight-flute-tap-4-40-unc-hss-tin","provider":"Voomi Supply","version":"1.0","type":"link"}