The Timken Company 9912 Radial Shaft Oil Seal

Description:

The Timken National 9912 oil seal is a premium radial shaft oil seal engineered to retain lubricants while preventing dirt, dust, moisture, and other contaminants from entering rotating equipment. Featuring a nitrile rubber sealing element with a spring-loaded dual-lip (Type 25) design, it provides reliable sealing performance for industrial, automotive, agricultural, and heavy-duty machinery. Commonly installed in gearboxes, wheel hubs, pumps, compressors, electric motors, and power transmission systems, the National 9912 oil seal is widely used by maintenance teams, OEMs, and system integrators for equipment repairs, seal replacements, retrofit projects, and preventive maintenance to extend service life and minimize lubricant leakage.

Applications:

The Timken National 9912 oil seal is designed for rotary shaft sealing applications where dependable lubricant retention and contaminant exclusion are essential. Its spring-loaded dual-lip construction makes it suitable for industrial gearboxes, wheel-end assemblies, agricultural machinery, pumps, compressors, electric motors, and other rotating equipment operating in demanding industrial environments.

Technical Specifications:

• Manufacturer Part Number (MPN): 9912
• Manufacturer: Timken National
• Product Type: Oil Seal
• Seal Type: Radial Shaft Oil Seal
• Series: 9000 Series
• Seal Design: Type 25 (Dual Lip with Spring)
• Material: Nitrile (Buna-N) Rubber
• Design Units: Inch (Imperial)
• Shaft Diameter (ID): 1.875 in (47.625 mm)
• Outside Diameter (OD): 2.865 in (72.771 mm)
• Housing Bore Diameter: 2.877 in (73.076 mm)
• Overall Width: 0.470 in (11.938 mm)
• Lip Design: Multi-Lip with Spring
• Construction: Solid, Steel Case Without Inner Case
• Maximum Shaft Surface Speed: 3,000 ft/min
• Misalignment Tolerance: 0.015 in @ 800 rpm; 0.010 in @ 4,200 rpm
• Continuous Operating Temperature: -40°F to 225°F (-40°C to 107°C)
• Weight: Approximately 0.21 lb (0.095 kg)
• Typical Applications: Industrial gearboxes, wheel hubs, pumps, compressors, electric motors, agricultural equipment, and power transmission systems.

Common Replacements:

• SKF CR 18731 Oil Seal
• Federal-Mogul National 9912
• Timken National 9912 Replacement Oil Seal