{"product_id":"osg-1590100-straight-flute-tap-1-4-20-unc-hss-plug","title":"Osg 1590100 Straight Flute Tap 1\/4-20 Unc Hss Plug","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe OSG 1590100 is a straight flute plug tap designed for cutting 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 features 4 flutes and a plug chamfer that balances thread starting ease with efficient chip evacuation. The H11 thread limit indicates a slightly oversized tolerance — 0.005 inches oversize — which compensates for material springback and helps achieve a proper fit in finished threads. Overall length is 2.5 inches with a thread length of approximately 0.748 inches. This tap is intended for use in machine tapping and hand tapping operations by machinists, maintenance technicians, and industrial tradespeople.\u003c\/p\u003e\u003cp\u003eThe OSG 1590100 is suited for through-hole and blind-hole tapping in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. The plug chamfer style — typically 3 to 5 threads of lead — makes it the standard choice for most general-purpose tapping where the tap can enter from the open end of a through hole or where adequate thread clearance exists in a blind hole. It is commonly used in production tapping setups and maintenance repair operations across manufacturing, HVAC equipment fabrication, and mechanical assembly environments.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e1\/4-20 UNC thread form with right-hand thread direction\u003c\/li\u003e\n\u003cli\u003e4-flute straight flute design for chip clearance in short-chipping materials\u003c\/li\u003e\n\u003cli\u003ePlug chamfer provides a balanced lead for through-hole and most blind-hole applications\u003c\/li\u003e\n\u003cli\u003eH11 thread limit with 0.005 inches oversize for accurate finished thread fit\u003c\/li\u003e\n\u003cli\u003eHigh-speed steel construction handles a broad range of ferrous and non-ferrous workpiece materials\u003c\/li\u003e\n\u003cli\u003eBright, uncoated finish — no coating buildup concerns in light-duty or intermittent use\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for tapping 1\/4-20 UNC threads in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel workpieces. Part of the OSG 101H series.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstall in a standard tap wrench, tapping fixture, or machine spindle with appropriate tap chuck. Ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill diameter for 1\/4-20 UNC threads before beginning. Apply cutting fluid appropriate to the workpiece material to extend tool life and improve thread finish. Never force a tap against resistance — back off periodically to break chips and prevent tap breakage.\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\u003eThreads per Inch\u003c\/strong\u003e: 20\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChamfer Style\u003c\/strong\u003e: Plug\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: H11\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmount Oversize\u003c\/strong\u003e: 0.005 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 0.748 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNeck Length\u003c\/strong\u003e: 1.181 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2.5 inches\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\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: 101H\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.029 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: 1590100\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51747401138482,"sku":"1590100","price":23.62,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/39c17231236120a7bbd48a070925a82c.jpg?v=1788879496","url":"https:\/\/voomisupply.com\/products\/osg-1590100-straight-flute-tap-1-4-20-unc-hss-plug","provider":"Voomi Supply","version":"1.0","type":"link"}