NSK 55BWKH12 Wheel Bearing and Hub Assembly - Rear

Overview of NSK 55BWKH12 Wheel Bearing and Hub Assembly

The NSK 55BWKH12 wheel bearing and hub assembly is designed specifically for Subaru Legacy and Outback models. This driven hub assembly features an integrated magnetic encoder for ABS systems, ensuring precise wheel speed monitoring and reliable performance.

• ABS equipped with magnetic encoder for accurate sensor readings
• Driven hub assembly compatible with Subaru Legacy and Outback
• Bolt circle diameter mounting flange: 107 mm
• Bolt circle diameter wheel flange: 100 mm
• Flange bolt hole quantity: 4 with M12x1.25 thread size
• Brake pilot diameter: 58 mm
• Flange diameter: 124 mm with 65.5 mm flange offset
• Hub pilot diameter: 84 mm and wheel pilot diameter: 56 mm
• Wheel stud quantity: 5 with M12x1.25 size
• Number of splines: 25
• Generation 3 design for improved durability

Technical Details and Specifications

The NSK 55BWKH12 is a driven wheel bearing and hub assembly engineered to meet the exact specifications of Subaru Legacy and Outback vehicles. It includes a magnetic encoder ABS tone ring integrated into the hub, which works with the vehicle’s ABS sensor to provide accurate wheel speed data. The assembly features a 107 mm bolt circle diameter on the mounting flange and a 100 mm bolt circle diameter on the wheel flange, secured by four M12x1.25 bolts. The flange diameter measures 124 mm with an offset of 65.5 mm, ensuring proper fitment and alignment. The brake pilot diameter is 58 mm, and the hub pilot diameter is 84 mm, which helps maintain precise positioning of the hub on the axle. The wheel flange supports five M12x1.25 wheel studs, and the hub has 25 splines to match the axle shaft.

Compatible Vehicles and Applications

This wheel bearing and hub assembly is compatible with the following Subaru models:

• Subaru Legacy
• Subaru Outback

It is designed for the driven axle side, making it suitable for front or rear driven wheels depending on the vehicle configuration.

Common Issues Addressed by NSK 55BWKH12

• Eliminates wheel bearing noise and vibration caused by wear or damage
• Restores proper ABS sensor function with integrated magnetic encoder
• Prevents wheel hub looseness and improves vehicle stability
• Corrects wheel alignment issues related to worn hub pilots or flange offsets
• Reduces brake rotor runout by maintaining proper brake pilot diameter

Installation Notes and Tips

• Ensure the correct orientation of the magnetic encoder relative to the ABS sensor
• Use proper torque specifications for M12x1.25 flange bolts and wheel studs
• Inspect axle splines and clean mating surfaces before installation
• Verify flange offset and pilot diameters match vehicle requirements
• Check ABS sensor functionality after installation to confirm signal integrity

Quality Assurance and Warranty

NSK manufactures the 55BWKH12 wheel bearing and hub assembly to meet OEM standards for fit, form, and function. The Generation 3 design incorporates improvements in durability and corrosion resistance. This part is backed by NSK’s quality control processes and typically includes a limited warranty against defects in materials and workmanship, providing confidence in long-term reliability.