{"product_id":"eagle-cutting-tool-ht-40000-8-b-i-hss-bottom-tap-4in-8tpi","title":"Eagle Cutting Tool HT-40000-8-B-I Hss Bottom Tap 4in 8TPI","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe EAGLE CUTTING TOOL HT-40000-8-B-I is a high-speed steel (HSS) special bottom tap designed for threading to the base of blind holes. Sized at 4 inches diameter with 8 threads per inch (TPI), this tap is built for heavy-duty threading applications where a plug or taper tap cannot reach full thread depth. Bottom taps carry minimal lead threads, allowing them to cut usable threads as close to the bottom of a hole as possible. Machinists, toolmakers, and industrial maintenance technicians rely on this tool when thread runout cannot be tolerated in close-tolerance work.\u003c\/p\u003e\n\u003cp\u003eThis tap is suited for use in production machining, fabrication shops, and maintenance environments where large-diameter internal threads are required. The 4 inches-8 TPI thread form is commonly found in heavy industrial machinery, large fastener assemblies, press frames, and structural components. HSS construction provides adequate toughness and wear resistance for threading steel, cast iron, aluminum, and similar materials when proper cutting fluid is applied.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eBottom tap geometry with minimal lead threads for threading to the base of blind holes\u003c\/li\u003e\n  \u003cli\u003e4 inches diameter, 8 TPI thread form for large-diameter heavy industrial threading\u003c\/li\u003e\n  \u003cli\u003eHigh-speed steel (HSS) construction for toughness across a range of machinable metals\u003c\/li\u003e\n  \u003cli\u003eSpecial bottom tap designation for close-tolerance applications where full thread depth is required\u003c\/li\u003e\n  \u003cli\u003eWeighs 2.12 pounds, indicating a full-size industrial tap body\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or direct-use industrial bottom tap for machines and fixtures requiring a 4 inches-8 TPI internal thread profile.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eBottom taps should be used only after a taper or plug tap has established the thread lead in the hole. Secure the workpiece firmly and use a calibrated tap wrench or machine tapping head to maintain axial alignment throughout the cut. Apply appropriate cutting fluid for the material being tapped to reduce heat buildup and extend tap life. Follow applicable shop safety procedures and ensure the tap is fully backed out and cleared of chips between passes.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 4 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThreads Per Inch (TPI)\u003c\/strong\u003e: 8\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTap Type\u003c\/strong\u003e: Special Bottom Tap\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: High-Speed Steel (HSS)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 2.12 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMinimum Order Quantity\u003c\/strong\u003e: 1\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: EAGLE CUTTING TOOL\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: HT-40000-8-B-I\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"EAGLE CUTTING TOOL","offers":[{"title":"Default Title","offer_id":51233628586290,"sku":"HT-40000-8-B-I","price":723.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/307622910.png?v=1780105095","url":"https:\/\/voomisupply.com\/products\/eagle-cutting-tool-ht-40000-8-b-i-hss-bottom-tap-4in-8tpi","provider":"Voomi Supply","version":"1.0","type":"link"}