{"product_id":"osg-1704301-spiral-flute-tap-3-8-16-unc-modified-bottoming","title":"Osg 1704301 Spiral Flute Tap 3\/8-16 Unc Modified Bottoming","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe OSG 1704301 is a spiral flute tap designed for cutting 3\/8-16 UNC internal threads in a range of challenging materials. Built from powdered metal with a steam oxide coating, it runs 3 right-hand flutes at a 15-degree helix angle, which helps evacuate chips back through the flute during through-hole and blind-hole operations. The modified bottoming chamfer allows threading close to the bottom of a blind hole while maintaining control. At 2.938 inches overall length with a 0.5-inch thread length, this tap fits standard tap holders and CNC tapping chucks used in production and job-shop environments. Installation and setup are handled by machinists and tool-and-die professionals.\u003c\/p\u003e\n\u003cp\u003eThis tap is suited for use on alloy steel, stainless steel, hardened steel, titanium, and high-nickel alloys — materials common in aerospace, industrial fabrication, and precision machining applications. The H5 thread limit and 2B class of fit produce threads that meet general-purpose tolerance requirements for most fastener and mechanical assembly specifications. It is appropriate for both manual tapping and CNC rigid tapping setups where a spiral flute geometry is preferred for chip control in blind-hole work.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e3\/8-16 UNC thread form with 2B class of fit and H5 thread limit for general-purpose tolerance\u003c\/li\u003e\n  \u003cli\u003ePowdered metal construction provides increased wear resistance compared to standard HSS\u003c\/li\u003e\n  \u003cli\u003eSteam oxide coating reduces friction and helps resist galling in difficult materials\u003c\/li\u003e\n  \u003cli\u003eModified bottoming chamfer allows threading near the base of blind holes\u003c\/li\u003e\n  \u003cli\u003e15-degree right-hand spiral flute geometry aids chip evacuation in blind-hole applications\u003c\/li\u003e\n  \u003cli\u003eNo coolant-through requirement — compatible with flood, mist, or paste lubricant setups\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eRated for use in alloy steel, stainless steel, hardened steel, titanium, and high-nickel alloys. Part of OSG Series 313. Designed as an OEM-style replacement or direct-use tap for standard 3\/8-16 UNC tapping applications in production and job-shop environments.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThis tap should be installed and operated by qualified machinists familiar with tapping speeds, feeds, and cutting fluid requirements for the target material. Always secure the workpiece and confirm the tap holder or chuck is properly aligned before starting the cut to prevent tap breakage. Follow the machine manufacturer and OSG Series 313 guidelines for RPM and lubrication specific to the material being tapped. Do not reverse the tap under power without confirming the tapping cycle is set for reversing spindle operation.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 3\/8-16 UNC\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: 3\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\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\u003eClass of Fit\u003c\/strong\u003e: 2B\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Limit\u003c\/strong\u003e: H5\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThreads per Inch\u003c\/strong\u003e: 16\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2.938 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 0.5 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.381 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNeck Length\u003c\/strong\u003e: 1.252 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSquare Length\u003c\/strong\u003e: 0.4375 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSquare Size\u003c\/strong\u003e: 0.286 inches\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\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Application\u003c\/strong\u003e: Alloy Steel, Stainless Steel, Hardened Steel, Titanium, High-Nickel Alloy\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 313\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.075 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: 1704301\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51733675508018,"sku":"1704301","price":75.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/0b3b6e424d957afca24e62bea6930ac7.jpg?v=1788757936","url":"https:\/\/voomisupply.com\/products\/osg-1704301-spiral-flute-tap-3-8-16-unc-modified-bottoming","provider":"Voomi Supply","version":"1.0","type":"link"}