31243-P5A-005 Bolt A Through - Overview. The 31243-P5A-005 Bolt A Through is a specifically engineered through bolt used within Honda marine engine systems. This component plays a vital role in securing various parts within the Active Marine system, ensuring the integrity and stable operation of your marine engine. Its design allows it to seamlessly fit and function within the mechanical assemblies, maintaining optimal performance and durability through precise manufacturing standards.. Key Feat