{"product_id":"osg-1754101-spiral-flute-tap-4-40-unc-modified-bottoming","title":"Osg 1754101 Spiral Flute Tap 4-40 Unc Modified Bottoming","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe OSG 1754101 is a spiral flute tap designed for threading 4-40 UNC holes in demanding materials. It features a modified bottoming chamfer, two right-hand spiral flutes with a 15-degree helix angle, and a steam oxide coating that reduces friction and extends tool life in production environments. The powdered metal construction provides consistent hardness and wear resistance across the cutting edges. With an overall length of 1.875 inches and a shank diameter of 0.141 inches, this tap is sized for small-diameter threading operations in machine shop, maintenance, and precision assembly applications. Thread limit is H3, suitable for standard tolerance fits on 4-40 UNC fasteners.\u003c\/p\u003e\u003cp\u003eThis tap is intended for threading alloy steel, stainless steel, hardened steel, titanium, and high-nickel alloy workpieces. The spiral flute geometry evacuates chips upward, making it well suited for blind-hole applications where chip packing is a concern. It is commonly used in CNC tapping, drill press, and tapping head setups across aerospace, automotive, and industrial maintenance operations requiring reliable small-thread production.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eModified bottoming chamfer allows threading close to the bottom of blind holes\u003c\/li\u003e\n\u003cli\u003e15-degree right-hand spiral flute geometry promotes upward chip evacuation\u003c\/li\u003e\n\u003cli\u003eSteam oxide coating reduces friction and galling on difficult-to-machine alloys\u003c\/li\u003e\n\u003cli\u003ePowdered metal construction delivers uniform hardness for consistent thread quality\u003c\/li\u003e\n\u003cli\u003eH3 thread limit ensures proper tolerance fit for standard 4-40 UNC fastener applications\u003c\/li\u003e\n\u003cli\u003eNo coolant-through requirement simplifies setup in standard machine environments\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for threading 4-40 UNC holes in alloy steel, stainless steel, hardened steel, titanium, and high-nickel alloy workpieces. Part of OSG Series 313.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstall in a tapping chuck, CNC spindle, or manual tapping head rated for the shank diameter. Ensure the workpiece is securely fixtured and the spindle is aligned perpendicular to the hole before engaging the tap. Use an appropriate cutting fluid for the workpiece material to reduce heat buildup and extend tool life. Inspect the tap for chipping or wear before each use, as small-diameter taps are susceptible to breakage if run in worn or misaligned setups.\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\u003eNumber of Flutes\u003c\/strong\u003e: 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Style\u003c\/strong\u003e: Spiral\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHelix Angle\u003c\/strong\u003e: 15 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: H3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThreads per Inch\u003c\/strong\u003e: 40\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Powdered Metal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Steam Oxide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 1.875 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 0.157 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\u003eNeck Length\u003c\/strong\u003e: 0.559 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\u003eWeight\u003c\/strong\u003e: 0.009 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 313\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: 1754101\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51728586604850,"sku":"1754101","price":60.72,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/c1a975d745c66530d5cee848db7fbeda.jpg?v=1788693669","url":"https:\/\/voomisupply.com\/products\/osg-1754101-spiral-flute-tap-4-40-unc-modified-bottoming","provider":"Voomi Supply","version":"1.0","type":"link"}