Reliance Electric 419904-51B Brush

Reliance Electric 419904-51B is a carbon motor brush from the 419904 family, designed as a direct OEM replacement for Reliance Electric DC motors that call for this brush style. Also cataloged as 41990451B, it is listed by Reliance Electric Co and appears in retailer and surplus catalogs under the same part number. The carbon brush body measures approximately 1.26 in (length) × 0.984 in (width) × 0.394 in (thickness), and it is built to fit the corresponding commutator slots and contact geometry used by Reliance motors matching the 419904-51B specification. This part is typically used in older Reliance motor configurations, where the 419904-51B brush type is specified by the OEM to ensure proper current collection and wear characteristics in the armature circuit. As with many OEM carbon brushes, it is commonly sourced from third-party distributors alongside other Reliance 419904 family brushes, making it a common option for repairs, rebuilds, or vintage equipment maintenance.