{"product_id":"osg-2858001-spiral-point-tap-5-8-18-unf-3-flute-plug","title":"Osg 2858001 Spiral Point Tap 5\/8-18 Unf 3 Flute Plug","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe OSG 2858001 is a spiral point plug tap designed for threading 5\/8-18 UNF right-hand internal threads in through-hole applications. Built from 3% vanadium high-speed steel (HSS-E) with a steam oxide coating, it delivers improved lubricity and corrosion resistance compared to uncoated tooling. The plug chamfer  -  typically 3 to 5 threads  -  allows the tap to start easily in a pre-drilled hole and drive chips forward, ahead of the cutting edge. With a 1.91-inch thread length and 3.811-inch overall length, this tap is suited for production threading in machine tool setups as well as bench work by skilled machinists and toolroom technicians.\u003c\/p\u003e\u003cp\u003eThis tap is used in threading operations across a wide range of ferrous and non-ferrous materials, including aluminum, low-carbon steel, medium-carbon steel, high-carbon steel, alloy steel, die steel, cast iron, and stainless steel. Its spiral point geometry pushes chips ahead of the tap, making it best suited for through-hole applications rather than blind holes. It carries a thread limit designation of H7, indicating an oversize tolerance class appropriate for situations where coated fasteners or specific fit requirements demand additional clearance. This tap is a standard choice for job shops, maintenance facilities, and production environments running threaded fastener or fitting work.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e5\/8-18 UNF thread form, right-hand, H7 thread limit with oversize designation\u003c\/li\u003e\n\u003cli\u003e3% vanadium HSS-E construction for improved wear resistance over standard M2 HSS\u003c\/li\u003e\n\u003cli\u003eSteam oxide coating reduces friction and provides mild corrosion protection\u003c\/li\u003e\n\u003cli\u003eSpiral point geometry drives chips forward  -  optimized for through-hole threading\u003c\/li\u003e\n\u003cli\u003e3 flutes with plug chamfer for positive starting and balanced cutting action\u003c\/li\u003e\n\u003cli\u003eCompatible with a wide range of workpiece materials including stainless and alloy steels\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for through-hole tapping in materials including aluminum, cast iron, low-, medium-, and high-carbon steel, alloy steel, die steel, and stainless steel. Thread limit H7 with oversize classification suits applications requiring additional thread clearance.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis tap should be installed in a tap holder, floating tap adapter, or rigid tapping chuck appropriate for the machine tool in use. Ensure the workpiece hole is drilled to the correct tap drill diameter for a 5\/8-18 UNF thread before beginning. Apply a suitable cutting fluid for the workpiece material  -  sulfurized oil for steels, water-soluble coolant or kerosene for aluminum. Inspect the tap for wear or chip packing between uses, and never force a tap that has stopped advancing under normal feed pressure.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 5\/8-18 UNF\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\u003eChamfer Type\u003c\/strong\u003e: Plug\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Limit\u003c\/strong\u003e: H7\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOversize\u003c\/strong\u003e: Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Vanadium High-Speed Steel (HSS-E, 3% Vanadium)\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: 3.811 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 1.91 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.48 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: 280\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.215 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: 2858001\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51740768272690,"sku":"2858001","price":95.07,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/095a3a62337f9be405fc22a58777961d.jpg?v=1788827327","url":"https:\/\/voomisupply.com\/products\/osg-2858001-spiral-point-tap-5-8-18-unf-3-flute-plug","provider":"Voomi Supply","version":"1.0","type":"link"}