{"product_id":"kennametal-4129998-hand-tap-1-1-4-7-unc-bottoming-hss","title":"Kennametal 4129998 Hand Tap 1-1\/4-7 Unc Bottoming Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe KENNAMETAL 4129998 is a straight-flute hand tap designed for cutting 1-1\/4-7 UNC internal threads in a bottoming configuration. Manufactured from high-speed steel with a bright, uncoated finish, it is built for threading operations where the tap must cut close to the bottom of a blind hole. The 4-flute design provides even chip distribution and thread accuracy. With an overall length of 5.75 inches and a thread length of 2.563 inches, this tap is sized for production and maintenance threading in metalworking environments. It carries a Class of Fit 3B and Thread Limit H4 for consistent, tolerance-controlled thread output. Licensed machinists, toolroom technicians, and maintenance mechanics are the primary users.\u003c\/p\u003e\u003cp\u003eThis tap is suited for hand tapping operations in cast iron and non-ferrous metals. The bottoming chamfer allows threading to within one to two threads of the bottom of a blind hole, making it the correct choice when full thread depth is required near the hole base. It is commonly used in repair, fabrication, and production environments where UNC 1-1\/4-7 threads must meet 3B fit tolerance. Part of the KENNAMETAL Series 5305 and 5303 tap families.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eBottoming chamfer for threading close to the bottom of blind holes\u003c\/li\u003e\n\u003cli\u003eHigh-speed steel construction for durability across cast iron and non-ferrous metal applications\u003c\/li\u003e\n\u003cli\u003e4-flute straight flute design for even chip load and thread consistency\u003c\/li\u003e\n\u003cli\u003eBright, uncoated finish — no coating buildup to affect thread tolerance\u003c\/li\u003e\n\u003cli\u003eClass of Fit 3B, Thread Limit H4 for controlled tolerance output\u003c\/li\u003e\n\u003cli\u003eRight-hand thread direction, standard UNC thread form\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for 1-1\/4-7 UNC threading applications in cast iron and non-ferrous metals. Compatible with standard tap wrenches and machine holders sized for a 1.021-inch shank diameter. Part of KENNAMETAL Series 5305 and 5303.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis tap is intended for use by qualified machinists or maintenance technicians. Before use, secure the workpiece and ensure the tap wrench or holder is properly sized for the 1.021-inch shank. Apply appropriate cutting fluid for the workpiece material to reduce wear and improve thread finish. Inspect the tap for damage before each use — a chipped or worn tap in a blind hole can result in breakage and workpiece loss.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1-1\/4-7\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNC\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\u003eClass of Fit\u003c\/strong\u003e: 3B\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Limit\u003c\/strong\u003e: H4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Straight\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 5.75 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 2.563 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 1.021 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\u003eMaterial Application\u003c\/strong\u003e: Cast Iron, 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: 5305, 5303\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: 4129998\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KENNAMETAL","offers":[{"title":"Default Title","offer_id":51733823422770,"sku":"4129998","price":539.3,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/aea9c132e14fe097dc5637fdfc59b808.jpg?v=1788759474","url":"https:\/\/voomisupply.com\/products\/kennametal-4129998-hand-tap-1-1-4-7-unc-bottoming-hss","provider":"Voomi Supply","version":"1.0","type":"link"}