The 63801-2RS is a highly specialized thin-section ball bearing designed for applications where minimizing weight and saving space are critical, without sacrificing durability. What sets this model apart from standard miniature bearings is its unique 7 mm width. This widened internal cavity allows for a significantly larger volume of lubricant compared to standard 5 mm wide equivalents. Fitted with premium double-contact rubber seals (2RS), this bearing effectively traps grease while locking out micro-abrasives and moisture, making it a highly reliable solution for micro-motors, premium cycling components, and delicate automated machinery.