{"product_id":"osg-1738401-spiral-point-tap-3-8-16-unc-plug-hss","title":"Osg 1738401 Spiral Point Tap 3\/8-16 Unc Plug Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe OSG 1738401 is a spiral point plug tap designed for threading 3\/8-16 UNC holes in a production or job-shop environment. Built from vanadium high-speed steel (HSS-E) with a steam oxide finish, it drives chips forward ahead of the cutting zone, making it well suited for through-hole tapping operations. The plug chamfer provides a gradual lead-in over several threads, balancing torque and cutting performance across a range of ferrous materials. The H5 thread limit holds a 2B class of fit, delivering consistent dimensional accuracy for standard fastener assemblies. Right-hand cutting, 3 flutes, and no coolant-through design keep the tool straightforward to run in conventional drill press, CNC, or tapping-head setups.\u003c\/p\u003e\u003cp\u003eThis tap is rated for use in hardened steel, low-carbon steel, medium-carbon steel, and stainless steel. The steam oxide coating reduces friction and provides a degree of corrosion resistance during storage and use. It is appropriate for general industrial maintenance, production threading, and repair applications where a 3\/8-16 UNC thread is required. The Series 300 designation places it within OSG standard catalog tooling. Overall length is 2.937 inches with a thread length of 0.759 inches (nominal 1-1\/4 inches) and a shank diameter of 0.381 inches, fitting standard tap holders and chucks sized for 3\/8 shank tooling.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eSpiral point geometry pushes chips forward, ideal for through-hole tapping\u003c\/li\u003e\n\u003cli\u003eVanadium HSS-E construction for improved wear resistance over standard M2 HSS\u003c\/li\u003e\n\u003cli\u003eSteam oxide finish reduces friction and protects against light corrosion\u003c\/li\u003e\n\u003cli\u003ePlug chamfer (approx. 3-5 thread lead) balances starting ease with torque load\u003c\/li\u003e\n\u003cli\u003eH5 thread limit produces consistent 2B class of fit for standard fastener applications\u003c\/li\u003e\n\u003cli\u003eRated for hardened steel, low-carbon steel, medium-carbon steel, and stainless steel\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eRated for use in hardened steel, low-carbon steel, medium-carbon steel, and stainless steel. Produces 3\/8-16 UNC internal threads to a 2B class of fit with an H5 thread limit.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eTapping should be performed by a machinist or maintenance technician familiar with cutting tool speeds, feeds, and tap alignment. Power down and secure the workpiece before tool changes. Use an appropriate tapping fluid or cutting oil for the material being threaded; dry tapping in stainless or hardened steel accelerates tool wear and risks breakage. Follow ASME B1.1 thread standards and verify hole diameter with the correct tap drill size before starting.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\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\u003eChamfer Type\u003c\/strong\u003e: Plug\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\u003eMaterial\u003c\/strong\u003e: Vanadium High-Speed Steel (HSS-E)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Steam Oxide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2.937 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 0.759 inches (nominal 1-1\/4 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\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterrupted Thread\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 300\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.08 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Application\u003c\/strong\u003e: Hardened Steel, Low-Carbon Steel, Medium-Carbon Steel, Stainless Steel\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: 1738401\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51742834917682,"sku":"1738401","price":46.14,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/94ab9b27b34552d094586a12226f5a7b.jpg?v=1788839686","url":"https:\/\/voomisupply.com\/products\/osg-1738401-spiral-point-tap-3-8-16-unc-plug-hss","provider":"Voomi Supply","version":"1.0","type":"link"}