{"product_id":"osg-1066300-straight-flute-tap-4-40-unc-2-flute-hss","title":"Osg 1066300 Straight Flute Tap 4-40 Unc 2 Flute Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe OSG 1066300 is a straight flute tap designed for cutting 4-40 UNC internal threads in a wide range of ferrous and non-ferrous materials. Built from high-speed steel with a bright, uncoated finish, this tap features a plug chamfer for general-purpose through-hole and blind-hole tapping. It carries a 2B and 3B class of fit with an H2 thread limit, making it suitable for standard and close-tolerance threaded fastener applications. The overall length is 1-7\/8 inches with a thread length of 9\/16 inches. Licensed machinists, tool-and-die makers, and maintenance technicians are the primary users of this tap in production and repair environments.\u003c\/p\u003e\n\u003cp\u003eThis tap is well suited for tapping operations in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. The straight flute design works effectively in through-hole applications where chip evacuation is straightforward and cutting fluid can reach the cutting zone. It is a common selection for small-fastener thread work on machined components, fixtures, and assemblies in both job-shop and production settings.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e4-40 UNC thread form with 40 threads per inch for fine small-diameter fastener applications\u003c\/li\u003e\n  \u003cli\u003eHigh-speed steel construction provides durability across a broad range of workpiece materials\u003c\/li\u003e\n  \u003cli\u003ePlug chamfer (typically 3-5 thread lead) suits both through-hole and moderately deep blind-hole tapping\u003c\/li\u003e\n  \u003cli\u003e2B and 3B class of fit with H2 thread limit for standard and close-tolerance thread requirements\u003c\/li\u003e\n  \u003cli\u003eRight-hand thread direction, the standard orientation for general tapping operations\u003c\/li\u003e\n  \u003cli\u003eBright, uncoated finish  -  compatible with most cutting oils and tapping fluids without coating compatibility concerns\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eRated for use in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. Designed as an OEM-style straight flute tap for standard 4-40 UNC tapping applications where a plug-style entry and H2 thread limit are specified.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThis tap is installed and driven by a machinist or maintenance technician using a tap wrench, tapping head, or CNC rigid-tap cycle. Before tapping, drill the correct tap drill size for a 4-40 UNC thread and ensure the workpiece is securely fixtured. Apply an appropriate cutting fluid or tapping compound for the workpiece material to extend tap life and improve thread finish. Do not force the tap if resistance increases suddenly  -  back off to break the chip, then continue.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\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: 2\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 and 3B\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\u003eOverall Length\u003c\/strong\u003e: 1-7\/8 inches (1.874 inches)\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\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: 0.681 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: 104\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.009 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: 1066300\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51742760599858,"sku":"1066300","price":23.52,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/0e48a920eb1140887ade6bcc6b7a155a.jpg?v=1788839274","url":"https:\/\/voomisupply.com\/products\/osg-1066300-straight-flute-tap-4-40-unc-2-flute-hss","provider":"Voomi Supply","version":"1.0","type":"link"}