The JCB 81900057 is a genuine OEM plain washer, essential for various JCB agricultural and construction machinery. Measuring 12.7 mm inner diameter, 25.4 mm outer diameter, and 2.38 mm thickness, this washer provides crucial spacing and load distribution. It is compatible with a wide range of JCB models, including 1CX, 2CX, 3CX, 4CX backhoe loaders, 500 series Loadall telescopic handlers, 400 series wheel loaders, and Fastrac tractors such as the 1115, 2150, and 8330 series, ensuring reliable performance and proper assembly.