{"product_id":"the-timken-company-8521s-radial-shaft-oil-seal","title":"The Timken Company 8521S Radial Shaft Oil Seal","description":"\u003ch3 data-section-id=\"17lc1ru\" data-start=\"0\" data-end=\"16\"\u003eDescription:\u003c\/h3\u003e\n\u003cp data-start=\"17\" data-end=\"816\"\u003eThe Timken National 8521S oil seal is a premium radial shaft oil seal engineered to retain lubricants while preventing the ingress of dirt, dust, moisture, and other contaminants in rotating equipment. Constructed with a durable nitrile sealing element, the 8521S features a springless multi-lip design that provides dependable sealing performance in industrial, automotive, agricultural, and heavy-duty applications. Commonly installed in gearboxes, wheel hubs, axles, pumps, electric motors, and power transmission equipment, the National 8521S is widely used by maintenance teams, OEMs, and system integrators for equipment repairs, seal replacements, retrofit projects, and preventive maintenance to maximize equipment reliability and reduce lubricant loss. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-section-id=\"5ms9th\" data-start=\"818\" data-end=\"835\"\u003eApplications:\u003c\/h3\u003e\n\u003cp data-start=\"836\" data-end=\"1295\"\u003eThe Timken National 8521S oil seal is designed for rotary shaft sealing applications where effective lubricant retention and contaminant exclusion are essential. Its springless multi-lip construction makes it suitable for industrial gearboxes, agricultural machinery, heavy-duty axles, wheel-end assemblies, pumps, compressors, electric motors, and other rotating equipment operating in demanding industrial environments. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-section-id=\"5hg6bl\" data-start=\"1297\" data-end=\"1326\"\u003eTechnical Specifications:\u003c\/h3\u003e\n\u003cp data-start=\"1327\" data-end=\"2158\"\u003e• Manufacturer Part Number (MPN): 8521S\u003cbr data-start=\"1366\" data-end=\"1369\"\u003e• Manufacturer: Timken National\u003cbr data-start=\"1400\" data-end=\"1403\"\u003e• Product Type: Oil Seal\u003cbr data-start=\"1427\" data-end=\"1430\"\u003e• Seal Type: Radial Shaft Oil Seal\u003cbr data-start=\"1464\" data-end=\"1467\"\u003e• Series: 8000 Series\u003cbr data-start=\"1488\" data-end=\"1491\"\u003e• Seal Design: Type 200E (Springless Multi-Lip)\u003cbr data-start=\"1538\" data-end=\"1541\"\u003e• Material: Nitrile (Buna-N) Rubber\u003cbr data-start=\"1576\" data-end=\"1579\"\u003e• Shaft Diameter (ID): 1.872 in (47.55 mm)\u003cbr data-start=\"1621\" data-end=\"1624\" data-is-only-node=\"\"\u003e• Housing Bore Diameter: 2.684 in (68.17 mm)\u003cbr data-start=\"1668\" data-end=\"1671\"\u003e• Outside Diameter: 2.701 in (68.61 mm)\u003cbr data-start=\"1710\" data-end=\"1713\"\u003e• Overall Width: 0.544 in (13.82 mm)\u003cbr data-start=\"1749\" data-end=\"1752\"\u003e• Design Units: Inch (Imperial)\u003cbr data-start=\"1783\" data-end=\"1786\"\u003e• Lip Design: Springless Multi-Lip\u003cbr data-start=\"1820\" data-end=\"1823\"\u003e• Durometer: 60–80 Shore A\u003cbr data-start=\"1849\" data-end=\"1852\"\u003e• Operating Temperature Range: -40°F to 225°F (-40°C to 107°C)\u003cbr data-start=\"1914\" data-end=\"1917\"\u003e• Weight: Approximately 0.105 lb (0.048 kg)\u003cbr data-start=\"1960\" data-end=\"1963\"\u003e• Typical Applications: Industrial gearboxes, wheel hubs, axles, pumps, compressors, electric motors, agricultural equipment, and power transmission systems. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-section-id=\"1cz0398\" data-start=\"2160\" data-end=\"2184\"\u003eCommon Replacements:\u003c\/h3\u003e\n\u003cp data-start=\"2185\" data-end=\"2283\"\u003e• SKF 18510 Oil Seal\u003cbr data-start=\"2205\" data-end=\"2208\"\u003e• Federal-Mogul National 8521S\u003cbr data-start=\"2238\" data-end=\"2241\"\u003e• Timken National 8521S Replacement Seal\u003c\/p\u003e","brand":"Timken","offers":[{"title":"New","offer_id":51714041217326,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0818\/1038\/files\/Ebay_website_image_2927657b-9898-4fef-a2c7-e1e3a9ec39d5.jpg?v=1770414677","url":"https:\/\/plgautomation.com\/products\/the-timken-company-8521s-radial-shaft-oil-seal","provider":"PLG Automation ","version":"1.0","type":"link"}