{"product_id":"osg-1165100-straight-flute-tap-1-4-20-unc-plug-hss","title":"Osg 1165100 Straight Flute Tap 1\/4-20 Unc Plug Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe OSG 1165100 is a straight flute plug tap designed to cut 1\/4-20 UNC internal threads in a wide range of ferrous and non-ferrous materials. Built from high-speed steel with a bright, uncoated finish, it delivers reliable thread-forming performance in through-hole and open-bottom applications where chip evacuation is straightforward. The plug chamfer  -  3 to 5 threads of lead  -  makes it the standard choice for most general-purpose tapping operations. With 3 flutes, an overall length of 2.5 inches, and a thread length of 1 inch, this tap fits standard tap holders and hand-tapping setups used daily in machining and maintenance environments.\u003c\/p\u003e\u003cp\u003eThe OSG 1165100 is suited for production and maintenance tapping in materials including aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. It is used in machine shops, fabrication facilities, and field maintenance settings wherever 1\/4-20 UNC threads are required. The H2 thread limit designation indicates a close tolerance fit, making it appropriate for standard fastener assemblies requiring consistent thread engagement.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e1\/4-20 UNC thread form with H2 thread limit for close-tolerance thread production\u003c\/li\u003e\n\u003cli\u003ePlug chamfer provides 3 to 5 threads of lead for easy starting in through-hole applications\u003c\/li\u003e\n\u003cli\u003eHigh-speed steel construction handles aluminum, cast iron, and carbon steel workpieces\u003c\/li\u003e\n\u003cli\u003eBright, uncoated finish suitable for use with standard cutting fluids\u003c\/li\u003e\n\u003cli\u003e3 straight flutes promote chip clearance in open and through-hole applications\u003c\/li\u003e\n\u003cli\u003eRight-hand thread direction for use with standard tap holders and drivers\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use in standard tap holders, T-handle wrenches, and CNC tapping chucks accepting a 0.255-inch shank diameter. Compatible with 1\/4-20 UNC thread applications across aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel workpieces. No coolant-through capability; external cutting fluid or cutting paste is recommended.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eTapping operations should be performed by a qualified machinist or maintenance technician familiar with cutting tool setup and speeds. Always secure the workpiece firmly and use a properly sized tap wrench or machine holder matched to the 0.255-inch shank. Apply appropriate cutting fluid for the workpiece material before and during tapping to extend tool life and improve thread finish. Back the tap out periodically to break chips and prevent tap breakage, especially in deeper holes.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1\/4-20 UNC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThreads per Inch\u003c\/strong\u003e: 20\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: H2\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: Plug\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 1 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.255 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSquare Length\u003c\/strong\u003e: 0.3125 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSquare Size\u003c\/strong\u003e: 0.191 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNeck Length\u003c\/strong\u003e: 1.1811 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\u003eMaterial Application\u003c\/strong\u003e: Aluminum, Cast Aluminum, Cast Iron, Low-Carbon Steel, Medium-Carbon Steel, High-Carbon Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 103\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.03 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: 1165100\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51740836561202,"sku":"1165100","price":23.61,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/4b6a1b3df1fda1cee9583dd91bb5ff00.jpg?v=1788827736","url":"https:\/\/voomisupply.com\/products\/osg-1165100-straight-flute-tap-1-4-20-unc-plug-hss","provider":"Voomi Supply","version":"1.0","type":"link"}