Timken National Oil Seal 45187S

Description:

The Timken National Oil Seal 45187S is a single-lip nitrile oil seal designed to retain lubricants and prevent contaminants from entering rotating shaft systems. It is commonly installed in industrial gearboxes, pumps, electric motors, conveyors, heavy-duty vehicle axles, and other power transmission equipment operating in demanding environments. Maintenance teams, OEMs, and industrial repair specialists use this oil seal for replacement, equipment rebuilds, retrofits, and preventive maintenance to extend component life and reduce lubricant loss.

Applications:

The Timken National Oil Seal 45187S is used in rotating equipment where effective lubricant retention and contaminant exclusion are essential for reliable operation. It is widely applied in industrial gearboxes, pumps, electric motors, conveyor systems, heavy-duty trucks, construction equipment, mining machinery, and general power transmission applications to help protect bearings and shafts from dirt, moisture, and lubricant leakage.

Technical Specifications:

• Manufacturer Part Number (MPN): 45187S
• Manufacturer: Timken
• Brand: National
• Product Type: Oil Seal
• Seal Type: Single Lip Without Spring
• Design Type: 4S
• Material: Nitrile (NBR)
• Shaft Diameter: 4.000 in (101.60 mm)
• Housing Bore: 4.876 in (123.85 mm)
• Outside Diameter: 4.881 in (123.98 mm)
• Overall Width: 0.250 in (6.35 mm)
• Construction: Solid
• Maximum Shaft Surface Speed: 2000 ft/min
• Misalignment Tolerance: 0.005 in
• Typical Application: General Purpose
• Continuous Operating Temperature: -40°F to 225°F (-40°C to 107°C)

Common Replacements:

• SKF Equivalent Oil Seal
• CR (Chicago Rawhide) Equivalent Oil Seal
• National 4S Series Oil Seal