{"product_id":"osg-1772101-spiral-point-tap-4-48-unc-plug-powdered-metal","title":"Osg 1772101 Spiral Point Tap 4-48 Unc Plug Powdered Metal","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe OSG 1772101 is a spiral point plug tap designed for threading operations in demanding materials including hardened steel, stainless steel, high-nickel alloy, and titanium. It cuts a 4-48 UNC right-hand internal thread to a 2B class of fit and carries an H2 thread limit for consistent tolerance control. The powdered metal construction provides the wear resistance needed for high-alloy workpieces, and the steam oxide coating reduces friction and helps resist galling during the cut. With 2 flutes and a plug chamfer, this tap is suited for through-hole applications where chip evacuation ahead of the tap is essential. Licensed machinists and tool-and-die technicians are the primary installers.\u003c\/p\u003e\u003cp\u003eThis tap is applied in production and maintenance machining environments where 4-48 UNC threads are required in tough, work-hardening materials. The spiral point geometry pushes chips forward through the hole, making it a reliable choice for CNC tapping centers and hand-tapping fixtures on through-holes. The Series 312NI designation identifies it as part of the OSG nickel-alloy and high-temperature-alloy-capable tap line, appropriate for aerospace, medical device, and industrial equipment fabrication.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e4-48 UNC thread form with 2B class of fit and H2 thread limit\u003c\/li\u003e\n\u003cli\u003ePowdered metal construction for enhanced wear resistance in hard and abrasive materials\u003c\/li\u003e\n\u003cli\u003eSteam oxide coating reduces friction and aids chip flow\u003c\/li\u003e\n\u003cli\u003eSpiral point geometry pushes chips forward, optimized for through-hole tapping\u003c\/li\u003e\n\u003cli\u003ePlug chamfer provides gradual thread engagement for controlled cutting action\u003c\/li\u003e\n\u003cli\u003eRated for hardened steel, stainless steel, high-nickel alloy, and titanium applications\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for cutting 4-48 UNC right-hand internal threads in hardened steel, stainless steel, high-nickel alloy, and titanium workpieces. Suitable for through-hole applications in CNC tapping centers and manual setups where forward chip evacuation is required.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is performed by a qualified machinist. Ensure the workpiece is securely fixtured and the spindle is aligned to prevent tap breakage in small-diameter, fine-pitch applications. Use a cutting fluid appropriate for the workpiece material, particularly when threading stainless steel or high-nickel alloys. Inspect the tap for wear regularly, as powdered metal taps in abrasive materials will exhibit predictable but accelerated wear compared to HSS tooling.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 4-48\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNC\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: H2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChamfer\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: Powdered Metal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: Steam Oxide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 0.66 inches (7\/16 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 1.874 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.141 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 312NI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.01 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: 1772101\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51733607776562,"sku":"1772101","price":64.93,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/4c1da7e96afef6cb77cdc8a2c3c0f932.jpg?v=1788756834","url":"https:\/\/voomisupply.com\/products\/osg-1772101-spiral-point-tap-4-48-unc-plug-powdered-metal","provider":"Voomi Supply","version":"1.0","type":"link"}