The Timken Company 55548 Radial Shaft Oil Seal

The Timken 55548 National Oil Seal is a single-lip radial shaft seal with a leather sealing lip encased in a solid steel housing, designed to retain lubricant while preventing dirt, moisture, and other contaminants from entering rotating shaft systems. It is intended for oil-lubricated equipment operating at moderate speeds where leather sealing materials are preferred and is commonly used in industrial gearboxes, agricultural machinery, construction equipment, pumps, and heavy-duty power transmission gear. Key specifications include shaft diameter 3.000 in, housing bore 4.626 in, outside diameter 4.631 in, and overall width 0.500 in; lip material leather; cross-section Type 5L; Series 50000; MPN 55548. Operating temperature range is -50°F to 200°F (-46°C to 93°C). Common replacements include SKF equivalent leather oil seal, CR (Chicago Rawhide) equivalent oil seal, and National 5L series oil seal.