{"product_id":"osg-2944001-spiral-flute-tap-7-8-9-unc-vanadium-hss","title":"Osg 2944001 Spiral Flute Tap 7\/8-9 Unc Vanadium Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe OSG 2944001 is a spiral flute tap designed for cutting right-hand internal threads to the 7\/8-9 UNC standard. It features a modified bottoming chamfer, allowing threads to be cut closer to the bottom of a blind hole than a standard taper or plug tap. Built from vanadium high-speed steel (HSS) with a steam oxide coating, this tap offers improved lubrication retention and corrosion resistance during cutting operations. The 45-degree helix angle drives chips up and out of the flute efficiently, reducing the risk of chip packing in blind-hole applications. Machinists and tool-and-die professionals use this tap in production and maintenance settings where precision thread form and close-to-bottom reach are required.\u003c\/p\u003e\n\u003cp\u003eThe OSG 2944001 is suited for threading operations in alloy steel, carbon steel, cast iron, stainless steel, die steel, and hardened steel. The modified bottoming chamfer and spiral flute geometry make it particularly well-matched for blind-hole applications where full thread depth close to the hole bottom is needed. It is used in machine shops, maintenance facilities, and manufacturing environments requiring tight thread tolerance control. The H5 thread limit designates a controlled oversize tolerance appropriate for general-purpose threading in these materials.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eModified bottoming chamfer for threading close to the bottom of blind holes\u003c\/li\u003e\n  \u003cli\u003e45-degree right-hand spiral flute promotes efficient chip evacuation in blind-hole cutting\u003c\/li\u003e\n  \u003cli\u003eVanadium high-speed steel construction provides wear resistance across a range of ferrous materials\u003c\/li\u003e\n  \u003cli\u003eSteam oxide coating improves lubrication retention and reduces galling during tapping\u003c\/li\u003e\n  \u003cli\u003eH5 thread limit for controlled oversize tolerance and consistent thread fit\u003c\/li\u003e\n  \u003cli\u003eNo coolant-through feature — designed for use with external cutting fluid application\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for cutting 7\/8-9 UNC right-hand internal threads in alloy steel, carbon steel, cast iron, stainless steel, die steel, and hardened steel workpieces.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThis tap is installed and operated by machinists using a tap wrench, tapping head, or CNC machining center with appropriate tapping cycle settings. Before tapping, confirm the drill hole is sized correctly for a 7\/8-9 UNC thread and that the workpiece is securely fixtured. Apply a suitable cutting fluid for the workpiece material to extend tool life and improve thread quality. Follow shop safety procedures and manufacturer guidelines when handling taps in hardened or difficult-to-machine materials.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 7\/8-9 UNC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThreads per Inch\u003c\/strong\u003e: 9\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: H5\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 4\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Style\u003c\/strong\u003e: Spiral\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHelix Angle\u003c\/strong\u003e: 45 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChamfer\u003c\/strong\u003e: Modified Bottoming\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 4.688 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 0.889 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNeck Length\u003c\/strong\u003e: 2.653 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.697 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSquare Length\u003c\/strong\u003e: 0.75 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSquare Size\u003c\/strong\u003e: 0.523 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Vanadium High-Speed Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Steam Oxide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Application\u003c\/strong\u003e: Alloy Steel, Carbon Steel, Cast Iron, Stainless Steel, Die Steel, Hardened Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.425 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 290\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: OSG\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 2944001\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51730632245554,"sku":"2944001","price":297.84,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/2a45cca7a2a70433ef2804ca3b4d0f0e.jpg?v=1788720574","url":"https:\/\/voomisupply.com\/products\/osg-2944001-spiral-flute-tap-7-8-9-unc-vanadium-hss","provider":"Voomi Supply","version":"1.0","type":"link"}