The McCormick 1957861C1 is a genuine OEM washer designed for various McCormick, Case IH, and Steyr tractor models, including the McCormick CX series (CX50, CX60, CX70, CX75, CX80, CX85, CX90, CX95, CX100, CX105, CX110), Case IH JX series, and Steyr Kompakt series. This essential component provides secure fastening, preventing loosening due to vibration and ensuring the longevity of connected parts. With an inner diameter of 10.5 mm, an outer diameter of 18 mm, and a thickness of 1.5 mm, this washer weighs approximately 0.001 kg.