{"product_id":"timken-34478d-double-cup-tapered-roller-bearing-3-x-4-7812-x-2-0626-34301","title":"Timken 34478D Double Cup Tapered Roller Bearing 3\" x 4.7812\" x 2.0626\" 34301","description":"\u003ch3 data-section-id=\"17lc1ru\" data-start=\"0\" data-end=\"16\"\u003eDescription:\u003c\/h3\u003e\n\u003cp data-start=\"17\" data-end=\"610\"\u003eThe Timken 34478D is a double tapered roller bearing cup (double outer ring) from the Timken 34000 Series. Designed for use with compatible Timken double cone assemblies such as the 34300 to form a complete TDO (Tapered Double Outer) bearing assembly, it provides a wide effective bearing spread for supporting heavy combined radial and axial loads while resisting overturning moments. This bearing is commonly used in industrial gearboxes, rolling mills, mining equipment, steel processing machinery, and other heavy-duty power transmission applications. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-section-id=\"5ms9th\" data-start=\"612\" data-end=\"629\"\u003eApplications:\u003c\/h3\u003e\n\u003cp data-start=\"630\" data-end=\"1030\"\u003eThe Timken 34478D double cup is engineered for heavy-duty applications requiring high rigidity, precise shaft alignment, and long service life. When paired with compatible Timken double cones, it is suitable for industrial gearboxes, rolling mills, mining machinery, paper mills, conveyors, and other rotating equipment subjected to high radial and thrust loads. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-section-id=\"5hg6bl\" data-start=\"1032\" data-end=\"1061\"\u003eTechnical Specifications:\u003c\/h3\u003e\n\u003cp data-start=\"1062\" data-end=\"2480\"\u003e• Manufacturer Part Number (MPN): 34478D\u003cbr data-start=\"1102\" data-end=\"1105\"\u003e• Manufacturer: Timken\u003cbr data-start=\"1127\" data-end=\"1130\"\u003e• Product Type: Double tapered roller bearing cup\u003cbr data-start=\"1179\" data-end=\"1182\"\u003e• Bearing Type: Double outer ring (TDO cup component)\u003cbr data-start=\"1235\" data-end=\"1238\"\u003e• Series: 34000 Series\u003cbr data-start=\"1260\" data-end=\"1263\"\u003e• Design Units: Inch\u003cbr data-start=\"1283\" data-end=\"1286\"\u003e• Cup Outside Diameter (OD): 4.7812 in (121.442 mm)\u003cbr data-start=\"1337\" data-end=\"1340\"\u003e• Double Cup Width (C): 1.5000 in (38.100 mm)\u003cbr data-start=\"1385\" data-end=\"1388\" data-is-only-node=\"\"\u003e• Compatible Cone Part Number: 34300 (also compatible with certain other 34000 Series double cones depending on application)\u003cbr data-start=\"1512\" data-end=\"1515\"\u003e• Cage Material (Assembly): Stamped steel\u003cbr data-start=\"1556\" data-end=\"1559\"\u003e• Bearing Material: Through-hardened bearing steel\u003cbr data-start=\"1609\" data-end=\"1612\"\u003e• Maximum Housing Fillet Radius: 0.030 in (0.80 mm)\u003cbr data-start=\"1663\" data-end=\"1666\"\u003e• Housing Backing Shoulder Diameter (Da): 4.60 in (116.84 mm)\u003cbr data-start=\"1727\" data-end=\"1730\"\u003e• e Factor: 0.45\u003cbr data-start=\"1746\" data-end=\"1749\"\u003e• K Factor: 1.30\u003cbr data-start=\"1765\" data-end=\"1768\"\u003e• Y1 Factor: 1.50\u003cbr data-start=\"1785\" data-end=\"1788\"\u003e• Y2 Factor: 2.23\u003cbr data-start=\"1805\" data-end=\"1808\"\u003e• Geometry Factor (Cg): 0.109\u003cbr data-start=\"1837\" data-end=\"1840\"\u003e• Dynamic Radial Load Rating (C90, One Row): 5,960 lbf (26.5 kN)\u003cbr data-start=\"1904\" data-end=\"1907\"\u003e• Dynamic Radial Load Rating (C90, Two Row): 10,400 lbf (46.1 kN)\u003cbr data-start=\"1972\" data-end=\"1975\"\u003e• Dynamic Radial Load Rating (C1, Two Row): 40,000 lbf (178 kN)\u003cbr data-start=\"2038\" data-end=\"2041\"\u003e• Weight: Approximately 1.31 lb (0.59 kg)\u003cbr data-start=\"2082\" data-end=\"2085\"\u003e• Function: Serves as the outer ring component of a TDO tapered roller bearing assembly for supporting heavy combined radial and axial loads.\u003cbr data-start=\"2226\" data-end=\"2229\"\u003e• Features: Double-cup construction, wide bearing spread for improved rigidity, precision-ground raceways, separable design, optimized internal geometry, and long service life in demanding industrial applications. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-section-id=\"1cz0398\" data-start=\"2482\" data-end=\"2506\"\u003eCommon Replacements:\u003c\/h3\u003e\n\u003cp data-start=\"2507\" data-end=\"2723\"\u003e• Timken 34478D double tapered roller bearing cup\u003cbr data-start=\"2556\" data-end=\"2559\"\u003e• SKF equivalent TDO double cup (application dependent)\u003cbr data-start=\"2614\" data-end=\"2617\"\u003e• NTN equivalent double tapered roller bearing cup\u003c\/p\u003e","brand":"Timken","offers":[{"title":"New","offer_id":51714060091694,"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_3caeb22e-b449-459e-816d-db5e97ae4df7.jpg?v=1770415226","url":"https:\/\/plgautomation.com\/products\/timken-34478d-double-cup-tapered-roller-bearing-3-x-4-7812-x-2-0626-34301","provider":"PLG Automation ","version":"1.0","type":"link"}