94251-04000 Lock (4mm) Pin - Overview. The 94251-04000 Lock (4mm) Pin is a critical fastener within the locking system of Honda marine engine and rigging components. Crafted to secure parts firmly in place, it plays a fundamental role in maintaining system reliability by preventing accidental detachment under operational stresses. This OEM pin is manufactured to match exact factory specifications, ensuring seamless integration with existing engine and rigging hardware, thereby preserving the int