{"product_id":"import-bdna-20742-bottoming-tap-9-16-12-unc-hss","title":"Import BDNA-20742 Bottoming Tap 9\/16-12 Unc Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe IMPORT BDNA-20742 is a straight flute bottoming tap designed to cut 9\/16-12 UNC internal threads to the bottom of a blind hole. Built from high-speed steel (HSS) with a gold oxide coating, this tap provides added lubricity and surface hardness for improved performance in ferrous and non-ferrous metals. The bottoming chamfer allows threading to within one or two threads of a hole's bottom, making it well suited for applications where thread engagement depth is critical. With four flutes and an H3 thread limit, this tap maintains tight dimensional control through the threading operation.\u003c\/p\u003e\u003cp\u003eThis tap is used in machine shops, maintenance facilities, and production environments where accurate UNC threads are required in blind holes. It is appropriate for use in drill press, milling machine, or hand-tapping setups when the application calls for a bottoming chamfer. Machinists, tool-and-die makers, and maintenance technicians working with steel, cast iron, aluminum, and similar materials will find this tap suitable for general-purpose thread repair and new-hole threading tasks.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eBottoming chamfer allows threading to the base of blind holes\u003c\/li\u003e\n\u003cli\u003e9\/16-12 UNC thread form for standard unified coarse-thread applications\u003c\/li\u003e\n\u003cli\u003eHigh-speed steel construction handles a wide range of metal workpieces\u003c\/li\u003e\n\u003cli\u003eGold oxide coating improves lubricity and reduces galling during cutting\u003c\/li\u003e\n\u003cli\u003eH3 thread limit provides controlled dimensional tolerance for consistent fit\u003c\/li\u003e\n\u003cli\u003eFour-flute design balances chip clearance and cutting support\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style straight flute bottoming tap for use in standard 9\/16-12 UNC tapping applications across general metalworking and maintenance operations.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eTapping should be performed by a qualified machinist or maintenance technician using a properly aligned tap wrench, drill press, or tapping head. Ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill diameter for 9\/16-12 UNC before beginning. Apply cutting fluid appropriate to the workpiece material to reduce heat and extend tap life. Reverse the tap periodically to break chips and prevent tap breakage, particularly in deeper blind holes.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 9\/16-12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThreads per Inch\u003c\/strong\u003e: 12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChamfer Type\u003c\/strong\u003e: Bottoming\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: H3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 4\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: Gold Oxide\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: IMPORT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: BDNA-20742\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"IMPORT-GENERIC","offers":[{"title":"Default Title","offer_id":51723895341362,"sku":"BDNA-20742","price":27.87,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/85a5f50c7955b51a637f3d32995a5bf1.jpg?v=1788609501","url":"https:\/\/voomisupply.com\/products\/import-bdna-20742-bottoming-tap-9-16-12-unc-hss","provider":"Voomi Supply","version":"1.0","type":"link"}