National 511021 Wheel Bearing - Rear Inner

Reliable Wheel Bearing for Toyota 4Runner, Pickup, T100, and Tacoma

The National 511021 wheel bearing is engineered to provide dependable performance for select Toyota models including the 4Runner, Pickup, T100, and Tacoma. Designed with a double row angular contact configuration, this wheel bearing ensures durability and smooth operation under various driving conditions.

• Double row angular contact design for enhanced load capacity
• Precision bore diameter of 1.575 inches (40 mm)
• Outer race diameter of 3.543 inches (90 mm) for secure fitment
• Width of 0.906 inches (23 mm) for optimal compatibility
• Compatible with Toyota 4Runner, Pickup, T100, and Tacoma models

Technical Specifications and Design Features

The National 511021 wheel bearing features a double row angular contact design, which provides improved axial and radial load handling compared to single row bearings. The inner and outer race bores measure 1.575 inches (40 mm), with a consistent width of 0.906 inches (23 mm) ensuring a precise fit. Both inner and outer races have a radius of 0.059 inches (1.5 mm), contributing to the bearing's structural integrity and smooth rotation. The outer race outside diameter is 3.543 inches (90 mm), matching OEM specifications for the compatible Toyota models.

Applications and Problem Solving

• Replaces worn or damaged wheel bearings on Toyota 4Runner, Pickup, T100, and Tacoma
• Addresses wheel noise and vibration issues caused by bearing wear
• Restores proper wheel alignment and rotation stability
• Prevents premature tire wear related to faulty bearings
• Improves overall driveline performance and safety

Installation Notes and Tips

When installing the National 511021 wheel bearing, ensure the hub assembly is clean and free of debris. Use proper tools to press the bearing into place without damaging the races. Verify the bearing is seated correctly and rotates smoothly before reassembling the wheel components. It is recommended to inspect related seals and replace them if necessary to maintain bearing longevity.

Quality Assurance and Warranty

National wheel bearings are manufactured to meet strict quality standards, ensuring reliable performance and durability. The 511021 part number is part of the Rwdb series and meets E-3 type specifications. While specific warranty details may vary, National typically offers coverage against manufacturing defects to provide confidence in your purchase.