Black bearing bearing 12 × 21 × 7 mm B5 63801-2RS UB-63801-B5

BLACKBEARING B5 63801-2RS Bearing – 12 × 21 × 7 mm

EAN: 3760290192461
Part Number: UB-63801-B5
Brand: BLACKBEARING
Type: Deep Groove Ball Bearing (2RS)

The UB-63801-B5 is a premium deep groove ball bearing developed for cycling and other demanding mechanical applications. The BLACKBEARING B5 series is engineered to deliver smooth operation, low friction, and exceptional durability while providing excellent resistance to water, dust, and contamination.

Key Features

• Premium BLACKBEARING B5 quality
• 63801-2RS standard
• Double rubber seals (2RS)
• Low rolling resistance
• Excellent protection against dust and moisture
• Precision manufacturing and assembly
• Chrome steel balls (SAE52100)
• Steel cage construction
• Pre-filled with high-quality lubricant
• Long service life and reliable performance

Technical Specifications

Applications

• Bicycle hubs
• Pedals
• Derailleur pulleys
• Frame pivots and linkage points
• BMX and urban bicycles
• Skateboards and inline skates
• Other precision rotating components

In Practice

The UB-63801-B5 is an excellent replacement bearing for worn or damaged original bearings. Its reinforced 2RS seals help keep out water and dirt, while the precision-ground races, chrome steel balls, and premium lubricant ensure smooth, efficient operation and long-term reliability. Designed specifically for demanding cycling applications, it delivers dependable performance in a wide range of conditions.