41109-ZV5-000 Gear Case End Nut - Overview. The 41109-ZV5-000 Gear Case End Nut is an essential locking component used within the gear case assembly of Honda marine engine systems. Specifically designed for Honda outboard motors including models BF35A, BF40A, BF45AM, and BF50A, this part plays a crucial role in securing the end of the gear case assembly to maintain reliable mechanical operation. Manufactured to exact factory specifications, it ensures seamless integration with existing parts, ma