All-purpose journal roller bearings for freight car and other applications are fully approved under AAR Certificate 5A and AAR Quality Assurance Program M-1003. Available in 4-1/4-inch by 8-inch through GG sizes for freight cars and locomotives, bearings contain hot rolled-ring forged and case-hardened inner and outer races to provide grain structure and core toughness for maximum fatigue resistance. Brenco, which manufactures and designs its own grease seals, is an ISO-9000-certified supplier.