{"product_id":"hertel-k008078as-4-40-unc-bottoming-tap-3-flute-hss","title":"Hertel K008078AS 4-40 Unc Bottoming Tap 3 Flute Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HERTEL K008078AS is a straight flute bottoming tap designed for cutting internal threads in through-holes and blind holes where threads must extend close to the bottom. Manufactured from high-speed steel (HSS) with a bright\/uncoated finish, this tap cuts a 4-40 UNC right-hand thread and is suited for use in small-fastener tapping operations common in precision machining, electrical panel fabrication, and light mechanical assembly. The bottoming chamfer — typically 1 to 2 thread leads — allows threading to near the full depth of a blind hole. With a 3-flute straight-flute geometry, it provides good chip clearance in short-chipping materials and maintains rigidity through the cut.\u003c\/p\u003e\u003cp\u003eThis tap is intended for use in ferrous and non-ferrous metals, plastics, and similar materials where a 4-40 UNC thread form is specified. It is suited for manual tapping with a tap wrench or low-speed machine tapping on drill presses, CNC machining centers, and tapping heads. The compact overall length of 1.875 inches makes it practical for use in tight workpiece geometries or toolholders with limited clearance. Machinists, tool-and-die makers, and maintenance mechanics installing small machine screws in electrical or mechanical assemblies will find this tap appropriate for production and repair work alike.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eBottoming chamfer for threading to near full depth in blind holes\u003c\/li\u003e\n\u003cli\u003eHigh-speed steel construction provides good wear resistance for general-purpose tapping\u003c\/li\u003e\n\u003cli\u003eBright\/uncoated finish suitable for use with cutting oil or tapping fluid\u003c\/li\u003e\n\u003cli\u003e3 straight flutes for chip clearance in short-chipping materials\u003c\/li\u003e\n\u003cli\u003eH1 thread limit for close-tolerance thread fits\u003c\/li\u003e\n\u003cli\u003eRight-hand thread direction, standard UNC form\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard replacement or general-purpose tap for any application requiring a 4-40 UNC internal thread. Compatible with standard tap wrenches, T-handle wrenches, and machine tapping holders accepting a 0.141 inch shank diameter.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eSecure the workpiece firmly before tapping and ensure the correct tap drill size has been used for 4-40 UNC thread engagement. Apply a suitable cutting fluid or tapping compound throughout the operation to reduce heat and extend tap life. For machine tapping, use a tapping head or floating holder to minimize axial load. Inspect the tap for chipping or wear before each use — a dull or damaged tap in a blind hole can result in breakage that is difficult to remove.\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\u003eThread Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Limit\u003c\/strong\u003e: H1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChamfer Type\u003c\/strong\u003e: Bottoming\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 0.5625 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length (OAL)\u003c\/strong\u003e: 1.875 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.141 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\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.2 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 23241600\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: HERTEL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: K008078AS\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51738463633714,"sku":"K008078AS","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/92a7bdc2387fb189e59f420ed00233ee.jpg?v=1788799861","url":"https:\/\/voomisupply.com\/products\/hertel-k008078as-4-40-unc-bottoming-tap-3-flute-hss","provider":"Voomi Supply","version":"1.0","type":"link"}