94103-05800 Washer Plain (5mm) - Overview. The 94103-05800 Washer Plain (5mm) is an essential hardware component designed for Honda marine engine systems. This plain washer provides a flat bearing surface to distribute load evenly, protecting connected components from damage. It ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. A 5mm plain washer that offers crucial mechanical support in fastening applications.. Genuine OEM part desi