Yamaha Screw, Countersunk - 90151-05048-00. Precision Fit for Flush-Mount Fastening on Yamaha Outboards. The Yamaha Screw, countersunk - 90151-05048-00 is a factory-original fastener designed for marine applications that require a flush-mount finish. Engineered to Yamaha's stringent OEM standards, this screw secures components without protrusion-ideal for parts where a smooth surface is critical for performance or aesthetics.. Whether you're conducting routine maintenance or replacing damaged ha