Black bearing bearing 6.35 × 15.875 × 4.98 mm B5 R4-2RS UB-R4-B5

BLACKBEARING B5 R4-2RS Bearing – 6.35 × 15.875 × 4.98 mm

EAN: 3760290190856
SKU: UB-R4-B5
Brand: BLACKBEARING
Type: Deep Groove Ball Bearing (2RS)

The UB-R4-B5 is a premium-quality deep groove ball bearing designed for cycling and precision mechanical applications. The R4-2RS designation refers to the bearing size: 6.35 × 15.875 × 4.98 mm. The BLACKBEARING B5 series provides excellent rolling performance, low friction, and long service life while offering effective protection against water, dust, and other contaminants.

The bearing is manufactured with SAE52100 chrome steel balls (ABEC 5), precision-machined steel rings with accurate raceways, a chrome-plated steel cage, reinforced 2RS rubber seals, and premium-quality lubricant. The high-quality components and precise assembly ensure smooth operation and reliable performance even under demanding cycling conditions.

The reinforced 2RS seals effectively protect the internal bearing components from moisture and contamination while retaining the lubricant inside the bearing for consistent low-friction operation.

Key Features

• Premium BLACKBEARING B5 quality
• R4-2RS standard
• Double rubber seals (2RS)
• Low rolling resistance
• Effective protection against water and dust
• Precision manufacturing and assembly
• SAE52100 chrome steel balls (ABEC 5)
• SAE52100 chrome steel rings with precision raceways
• Chrome-plated steel cage
• Filled with high-quality lubricant
• Long service life and reliable operation

Technical Specifications

Applications

• Wheel hubs
• Pedals
• Derailleur pulleys
• Suspension components
• Small precision rotating parts
• Other bicycle components

In Practice

The UB-R4-B5 is an excellent choice for bicycle applications where compact dimensions, precise rotation, low friction, and long service life are essential. The double 2RS sealing system provides reliable protection against external contaminants while helping to retain lubricant inside the bearing.

Precision manufacturing, high-quality SAE52100 steel components, and ABEC 5 grade balls ensure smooth, quiet, and reliable operation even under demanding cycling conditions.