{"product_id":"osg-1172802-straight-flute-tap-1-2-20-unf-hss-plug","title":"Osg 1172802 Straight Flute Tap 1\/2-20 Unf Hss Plug","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe OSG 1172802 is a straight flute plug tap designed for cutting 1\/2-20 UNF right-hand internal threads in a wide range of ferrous and non-ferrous materials. Built from high-speed steel (HSS), it features three straight flutes and a plug chamfer that distributes cutting load across several leading threads for controlled thread entry. The 3B class of fit and H3 thread limit ensure dimensional accuracy consistent with standard UNF fastener applications. With an overall length of 3.375 inches and a thread length of 1.656 inches, it fits standard tap holders and machines used in production and maintenance environments.\u003c\/p\u003e\u003cp\u003eThis tap is suited for through-hole and blind-hole tapping operations where chip flow out of the hole is not a concern and straight flute geometry provides adequate performance. Typical applications include tapping pre-drilled holes in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel workpieces. It is used by machinists, maintenance technicians, and tool-and-die professionals in job shops, production lines, and field repair settings. The plug chamfer makes it appropriate for starting a thread in a new hole as well as continuing a partially formed thread.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e1\/2-20 UNF thread form, right-hand cut, 3B class of fit\u003c\/li\u003e\n\u003cli\u003eH3 thread limit for consistent dimensional control within UNF tolerance\u003c\/li\u003e\n\u003cli\u003eThree straight flutes suited for short-chipping materials including cast iron and aluminum alloys\u003c\/li\u003e\n\u003cli\u003ePlug chamfer with approximately 3-5 chamfered threads for gradual thread engagement\u003c\/li\u003e\n\u003cli\u003eHigh-speed steel construction provides wear resistance across the listed material applications\u003c\/li\u003e\n\u003cli\u003e3.375 inch overall length fits standard tap wrenches, T-handle holders, and machine spindles\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use in 1\/2-20 UNF through-hole and blind-hole tapping operations in aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel workpieces. No specific machine or system compatibility data was provided in the product input.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eMachinists and maintenance technicians should ensure the workpiece is securely fixtured and that the correct tap drill size for 1\/2-20 UNF has been used before tapping. Apply cutting fluid or tapping compound appropriate to the workpiece material to extend tool life and improve thread quality. When tapping by hand, use a tap wrench with steady axial pressure and back off periodically to break chips. When machine tapping, verify spindle speed is appropriate for the material and HSS tooling before starting the cut.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1\/2-20\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNF\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClass of Fit\u003c\/strong\u003e: 3B\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Limit\u003c\/strong\u003e: H3\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\u003eThread Length\u003c\/strong\u003e: 1.656 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3.375 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: High-Speed Steel\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, High-Carbon Steel, Low-Carbon Steel, Medium-Carbon Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 103\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: 1172802\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51743975801138,"sku":"1172802","price":56.52,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/cb138d170ad900884cdcdc937aaab2fa.jpg?v=1788852243","url":"https:\/\/voomisupply.com\/products\/osg-1172802-straight-flute-tap-1-2-20-unf-hss-plug","provider":"Voomi Supply","version":"1.0","type":"link"}