{"product_id":"osg-3147803-straight-flute-tap-1-4-20-unc-cobalt-nitride","title":"Osg 3147803 Straight Flute Tap 1\/4-20 Unc Cobalt Nitride","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe OSG 3147803 is a straight flute tap designed for cutting internal 1\/4-20 UNC threads in plastic and similarly machinable materials. Built from cobalt high-speed steel and finished with a nitride coating, it delivers solid wear resistance and heat tolerance across production and maintenance threading applications. The plug chamfer style provides a gradual thread lead-in, making it well suited for through-hole tapping. With 4 flutes and a 2B class of fit, this tap produces threads that meet standard fastener engagement requirements. Overall length is 2.5 inches, and the shank diameter measures 0.255 inches. Installation is performed by machinists and maintenance technicians using standard tapping equipment.\u003c\/p\u003e\n\u003cp\u003eThe OSG 3147803 is intended for through-hole threading operations in plastic workpieces, though the cobalt construction and nitride coating extend its service life in moderately abrasive materials as well. The plug chamfer entry distributes cutting load across several lead threads, reducing tap breakage risk in hand-tapping and machine-tapping setups alike. It belongs to OSG Series 114 and carries a right-hand thread direction. This tap is a practical stock item for shops that regularly thread 1\/4-20 UNC holes in light-duty assemblies, fixtures, and enclosures.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eCobalt high-speed steel construction for improved heat and wear resistance over standard HSS\u003c\/li\u003e\n  \u003cli\u003eNitride coating reduces friction and extends cutting tool life\u003c\/li\u003e\n  \u003cli\u003ePlug chamfer distributes cutting forces across multiple lead threads for smoother entry\u003c\/li\u003e\n  \u003cli\u003e4-flute design provides good chip clearance and thread form stability\u003c\/li\u003e\n  \u003cli\u003e2B class of fit meets standard tolerance requirements for general-purpose 1\/4-20 UNC threaded assemblies\u003c\/li\u003e\n  \u003cli\u003eRight-hand thread direction for conventional tapping setups\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for cutting 1\/4-20 UNC internal threads in plastic; cobalt construction and nitride coating also support use in other machinable materials where heat generation is a factor. Straight flute geometry is best suited to through-hole applications.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThis tap should be installed and operated by machinists or maintenance technicians familiar with threading tool setup. Ensure the workpiece is securely fixtured and the tap is properly aligned to the hole axis before beginning the threading operation. Use an appropriate tapping fluid or cutting compound recommended for the workpiece material to reduce heat and improve thread finish. Always back the tap out periodically to clear chips and prevent tap breakage.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\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\u003eClass of Fit\u003c\/strong\u003e: 2B\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 4\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChamfer Type\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\u003eMaterial\u003c\/strong\u003e: Cobalt High-Speed Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: Nitride\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: 0.594 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\u003eNeck Length\u003c\/strong\u003e: 0.9966 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: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Application\u003c\/strong\u003e: Plastic\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 114\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.035 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\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: 3147803\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51737747226930,"sku":"3147803","price":25.17,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/c5d80c4a192f278e7eaf59216138f599.jpg?v=1788793108","url":"https:\/\/voomisupply.com\/products\/osg-3147803-straight-flute-tap-1-4-20-unc-cobalt-nitride","provider":"Voomi Supply","version":"1.0","type":"link"}