{"product_id":"osg-1406502-spiral-flute-tap-4-40-unc-bottoming-hss","title":"Osg 1406502 Spiral Flute Tap 4-40 Unc Bottoming Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe OSG 1406502 is a spiral flute bottoming tap designed for cutting 4-40 UNC internal threads in a wide range of ferrous and non-ferrous materials. Built from high-speed steel and finished with an elektraLUBE coating, this tap is engineered for controlled chip evacuation in blind-hole applications where full thread depth close to the bottom of the bore is required. The two-flute spiral design drives chips back up and out of the hole during tapping, reducing the risk of chip packing. At 1-7\/8 inches overall length with an H2 thread limit, it holds a 2B\/3B class of fit tolerance suited for standard fastener assemblies. Right-hand thread direction and a 50-degree helix angle complete the cutting geometry.\u003c\/p\u003e\u003cp\u003eThis tap is intended for use in machine shop, production, and maintenance environments where 4-40 UNC blind holes are tapped in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. The bottoming chamfer style makes it the correct choice when threads must begin within one to two pitches of the hole bottom, such as when tapping into thin stock or shallow bosses. It is typically run in CNC machining centers, drill presses, or tapping heads using a rigid or floating tap holder.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eBottoming chamfer for full thread depth in blind holes\u003c\/li\u003e\n\u003cli\u003eSpiral flute geometry evacuates chips upward during cutting\u003c\/li\u003e\n\u003cli\u003eelektraLUBE coating reduces friction and extends tool life in steel and aluminum\u003c\/li\u003e\n\u003cli\u003eH2 thread limit holds 2B and 3B class of fit tolerances\u003c\/li\u003e\n\u003cli\u003e50-degree right-hand helix angle for positive chip control\u003c\/li\u003e\n\u003cli\u003eHigh-speed steel construction suitable for a broad range of workpiece materials\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for cutting 4-40 UNC internal threads in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel workpieces. Fits standard tap holders accepting the shank diameter of this series.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis tap should be installed in a rigid or floating tap holder sized for the shank diameter and used with a machine or hand tapping setup appropriate for 4-40 UNC threading. Ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill diameter for a 4-40 UNC thread before tapping. Apply a cutting fluid or tapping compound compatible with the workpiece material to supplement the elektraLUBE coating and extend tap life. Do not exceed recommended RPM for the material and tap size, and back the tap out periodically in hand-tapping operations to break and clear chips.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 4-40\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClass of Fit\u003c\/strong\u003e: 2B \/ 3B\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Limit\u003c\/strong\u003e: H2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChamfer\u003c\/strong\u003e: Bottoming\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHelix Angle\u003c\/strong\u003e: 50 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Style\u003c\/strong\u003e: Spiral\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 1-7\/8 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: elektraLUBE\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\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 107\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.015 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: 1406502\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51742470603058,"sku":"1406502","price":58.04,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/36a529a6ba718e8a11d94ddcc4556b15.jpg?v=1788837680","url":"https:\/\/voomisupply.com\/products\/osg-1406502-spiral-flute-tap-4-40-unc-bottoming-hss","provider":"Voomi Supply","version":"1.0","type":"link"}