{"product_id":"osg-2916608-spiral-flute-tap-4-40-unc-ticn-vanadium-hss","title":"Osg 2916608 Spiral Flute Tap 4-40 Unc Ticn Vanadium Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe OSG 2916608 is a spiral flute tap designed for cutting internal 4-40 UNC threads in a wide range of ferrous materials. Built from vanadium high-speed steel and finished with a titanium carbonitride (TiCN) coating, it delivers extended tool life in demanding production and job-shop environments. The modified bottoming chamfer allows threading close to the bottom of a blind hole. With a 45-degree helix angle and right-hand flute direction, the tap efficiently evacuates chips upward out of the hole, reducing the risk of chip packing in interrupted or deep-hole applications. Machinists and tool-and-die technicians are the primary users.\u003c\/p\u003e\u003cp\u003eThis tap is suited for threading 4-40 UNC holes in alloy steel, carbon steel, cast iron, stainless steel, die steel, and hardened steel. The modified bottoming chamfer makes it well-suited for blind-hole work where thread engagement close to the hole bottom is required. The TiCN coating adds surface hardness and lubricity, making it a practical choice for stainless steel and harder alloy grades where uncoated HSS taps wear quickly. It is used in manual tapping, CNC machining centers, and dedicated tapping machines.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e4-40 UNC right-hand thread form with H5 thread limit for close-tolerance fits\u003c\/li\u003e\n\u003cli\u003eTiCN coating increases surface hardness and reduces friction against difficult materials\u003c\/li\u003e\n\u003cli\u003e45-degree spiral flute helix lifts chips out of blind holes, preventing re-cutting\u003c\/li\u003e\n\u003cli\u003eModified bottoming chamfer enables threading near the base of blind holes\u003c\/li\u003e\n\u003cli\u003eVanadium high-speed steel base material resists heat and wear in steel and cast iron\u003c\/li\u003e\n\u003cli\u003eOversize designation accommodates coating buildup to maintain thread tolerance\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for cutting 4-40 UNC internal threads in alloy steel, carbon steel, cast iron, stainless steel, die steel, and hardened steel workpieces across manual and machine tapping applications.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eA licensed machinist or toolroom technician should verify correct tap drill size and hole depth before use. Secure the workpiece and ensure the tap is aligned perpendicular to the hole to prevent tap breakage, especially in harder materials. Use a compatible tapping fluid or cutting oil appropriate for the workpiece material. Inspect the tap for wear or chipping before each use, as a damaged tap in hardened steel can break and require EDM extraction.\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\u003eThreads per Inch\u003c\/strong\u003e: 40\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Direction\u003c\/strong\u003e: Right Hand\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\u003eThread Limit\u003c\/strong\u003e: H5\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\u003c\/strong\u003e: TiCN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 1.875 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length (Decimal)\u003c\/strong\u003e: 3.375 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 0.196 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNeck Length\u003c\/strong\u003e: 1.933 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.367 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSquare Length\u003c\/strong\u003e: 0.1875 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSquare Size\u003c\/strong\u003e: 0.11 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOversize\u003c\/strong\u003e: Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 290\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: OSG\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 2916608\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51743638749490,"sku":"2916608","price":59.58,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/02ab667616efb4d987ba47b34c328acb_85746133-3b1f-4d22-a658-7b5da581c0d6.jpg?v=1788848779","url":"https:\/\/voomisupply.com\/products\/osg-2916608-spiral-flute-tap-4-40-unc-ticn-vanadium-hss","provider":"Voomi Supply","version":"1.0","type":"link"}