{"product_id":"kennametal-5455238-spiral-point-tap-4-40-unc-hss-e","title":"Kennametal 5455238 Spiral Point Tap 4-40 Unc Hss-e","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe KENNAMETAL 5455238 is a spiral point tap designed for right-hand through-hole threading in 4-40 UNC applications. Built from High-Speed Steel-E (HSS-E) and finished with a tri-coating of TiN, CrC, and C, this tap delivers hard-material performance in stainless steel and non-ferrous metal workpieces. The plug chamfer provides controlled thread lead-in, while the 2-flute geometry channels chips forward through the hole during cutting. At 1.875 inches overall length with a 0.510-inch thread length, it fits standard tapping chucks and CNC tap holders sized for small-diameter threading work. It carries an H2 thread limit for 2B and 3B class-of-fit tolerances.\u003c\/p\u003e\u003cp\u003eThis tap is suited for production and maintenance threading operations where small-diameter, fine-pitch threads are required in through-hole configurations. It is built for stainless steel and non-ferrous metals, making it a practical choice for precision machined components, fastener-thread preparation, and tooling fixtures. The Series T820 designation places it in a product family engineered for consistent performance on CNC machining centers and manual drill presses. Licensed machinists and tool-and-die technicians are the primary users of this tap size.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eSpiral point geometry pushes chips forward through the hole, reducing clogging in through-hole applications\u003c\/li\u003e\n\u003cli\u003eHSS-E base material provides increased toughness and wear resistance compared to standard HSS\u003c\/li\u003e\n\u003cli\u003eTri-coating of TiN, CrC, and C improves surface hardness and lubricity for extended tool life\u003c\/li\u003e\n\u003cli\u003ePlug chamfer (3-5 thread lead) for smooth thread entry and reduced starting torque\u003c\/li\u003e\n\u003cli\u003eH2 thread limit ensures compatibility with 2B and 3B class-of-fit thread gauging requirements\u003c\/li\u003e\n\u003cli\u003eRight-hand cut with 40 threads per inch at 0.025-inch pitch for 4-40 UNC standard\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for through-hole threading of 4-40 UNC threads in stainless steel and non-ferrous metal workpieces. Fits standard tapping chucks and holders accepting a 0.141-inch shank diameter.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis tap is installed and operated by machinists or tool-and-die technicians using a tapping chuck, CNC rigid tap holder, or manual tap wrench. Always ensure the workpiece is securely fixtured and a suitable cutting fluid is applied, particularly when tapping stainless steel. Confirm the through-hole is drilled to the correct tap drill size for 4-40 UNC before beginning the threading operation. Do not reverse-drive a broken tap without appropriate extraction tooling.\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\u003eThread Pitch\u003c\/strong\u003e: 0.025 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChamfer Style\u003c\/strong\u003e: Plug\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Direction\u003c\/strong\u003e: Right Hand\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 Limit\u003c\/strong\u003e: H2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 1.875 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 0.510 inches (13.00 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.141 inches (3.58 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNeck Length\u003c\/strong\u003e: 0.180 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSquare Size\u003c\/strong\u003e: 2.74 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: High-Speed Steel-E (HSS-E)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: KSMN34\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: TiN, CrC, C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication\u003c\/strong\u003e: Through-Hole Threading\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Application\u003c\/strong\u003e: Stainless Steel, Non-Ferrous Metal\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: T820\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.1 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: KENNAMETAL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 5455238\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KENNAMETAL","offers":[{"title":"Default Title","offer_id":51737817579826,"sku":"5455238","price":60.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/861d04fdd0d65732ca5807df8952d8d4_6fd58da7-9954-49ae-b60b-135e4f6c7817.jpg?v=1788793910","url":"https:\/\/voomisupply.com\/products\/kennametal-5455238-spiral-point-tap-4-40-unc-hss-e","provider":"Voomi Supply","version":"1.0","type":"link"}