Timken 55078S Radial Shaft Oil Seal NBR Lip With Spring

Description:

The Timken National Oil Seal 55078S is a heavy-duty single-lip radial shaft oil seal designed to retain lubricants while preventing dirt, dust, moisture, and other contaminants from entering rotating shaft systems. It features a spring-loaded nitrile (NBR) sealing lip with a reinforced steel case, providing reliable sealing performance in industrial gearboxes, pumps, compressors, mining equipment, heavy-duty machinery, and power transmission systems. Its robust Type 5S construction is well suited for large shaft applications requiring dependable performance and long service life.

Applications:

The Timken National Oil Seal 55078S is engineered for rotary shaft sealing in oil- and grease-lubricated equipment operating under demanding industrial conditions. Its spring-loaded single-lip design provides excellent lubricant retention and contaminant exclusion, making it suitable for industrial gearboxes, heavy-duty pumps, compressors, mining equipment, manufacturing machinery, conveyors, and power transmission systems.

Technical Specifications:

• Manufacturer Part Number (MPN): 55078S
• Manufacturer: Timken
• Brand: National
• Product Type: Oil Seal
• Series: 50000 Series
• Seal Type: Type 5S Single-Lip with Loaded Spring
• Lip Material: Nitrile Rubber (NBR)
• Case Material: Steel with Inner Case
• Measurement System: Inch
• Shaft Diameter (ID): 9.750 in (247.650 mm)
• Outside Diameter (OD): 11.260 in (286.004 mm)
• Housing Bore: 11.250 in (285.750 mm)
• Overall Width: 0.750 in (19.050 mm)
• Construction: Solid
• Lip Design: Single Lip with Spring
• Redi-Coat: Yes
• Maximum Shaft Surface Speed: 3,000 ft/min
• Misalignment Tolerance: 0.015 in at 800 RPM; 0.010 in at 4,200 RPM
• Continuous Operating Temperature: -40°F to 225°F (-40°C to 107°C)
• Weight: Approximately 2.88 lb (1.31 kg)
• Typical Applications: Industrial Gearboxes, Heavy-Duty Pumps, Compressors, Mining Equipment, Manufacturing Machinery, Power Transmission Systems.

Common Replacements:

• SKF Equivalent Heavy-Duty Oil Seal
• CR (Chicago Rawhide) 97545
• Garlock 210863654