90757-881-505 Split 3Mm Pin - Overview. The 90757-881-505 Split 3Mm Pin is a small yet essential hardware component within Honda marine engine systems. Serving as a cotter or retaining pin, it is designed to secure various components such as propeller shafts, stern brackets, and adjust rods, thereby ensuring reliable mechanical function and preventing unwanted disassembly or slippage. Engineered to Honda's factory specifications, this split pin guarantees seamless integration with existing parts