90401-ZW1-000 Plain (8mm) Washer - Overview. The 90401-ZW1-000 Plain (8mm) Washer is a critical hardware component designed specifically for Honda marine engine systems. It plays a fundamental role in distributing force evenly across surfaces when fasteners are tightened, thereby preventing damage and maintaining secure assemblies. This plain washer ensures seamless integration with existing parts, maintaining optimal performance and durability essential for reliable marine operation.. Key Features. Flat plain washer type designed for general purpose load distribution.. Made to OEM Honda specifications for dimension, material, and tolerances.. Ensures even force distribution to prevent surface damage under fastener pressure.. Compatible with Honda Active Marine engine series and other marine applications.. Constructed from durable alloy steel with corrosion resistance suitable for marine environments.. OEM-style design guarantees proper fit and maintains system integrity and operationa