Black bearing bearing 12 × 21 × 5 mm B5 6801-2RS / 61801-2RS UB-6801-B5

BLACKBEARING B5 6801-2RS Bearing – 12 × 21 × 5 mm

EAN: 3760290191808
Part Number: UB-6801-B5
Brand: BLACKBEARING
Type: Deep Groove Ball Bearing (2RS)

The UB-6801-B5 is a premium-quality deep groove ball bearing designed specifically for cycling and precision mechanical applications. The 61801-2RS and 6801-2RS designations refer to the same bearing size. As part of the BLACKBEARING B5 series, it delivers excellent rolling performance, low friction, and long service life while providing effective protection against water, dust, and other contaminants. It is an ideal choice for wheel hubs, bottom brackets, and other rotating bicycle components.

Key Features

• Premium BLACKBEARING B5 quality
• 6801-2RS / 61801-2RS standard bearing
• Double rubber seals (2RS)
• Low rolling resistance
• Effective protection against dust and moisture
• Precision manufacturing and assembly
• SAE52100 chrome steel balls (ABEC 5)
• SAE52100 chrome steel rings with precision-ground raceways
• Steel cage
• Pre-filled with high-quality lubricant
• Long service life and reliable performance
• Reinforced 2RS seals for enhanced water and dust resistance

Technical Specifications

Applications

• Wheel hubs
• Bottom bracket systems
• Pedals
• Suspension pivots
• Derailleur pulleys
• Other precision rotating assemblies

In Practice

The UB-6801-B5 is an ideal choice for applications where compact dimensions, low weight, and reliable performance are essential. The dual 2RS seals effectively protect the internal components from moisture and contamination while retaining lubricant inside the bearing. Precision manufacturing, premium materials, and ABEC 5-grade balls ensure smooth, quiet, and durable operation, even under demanding riding conditions.