The 628556 washer is an OEM Continental aircraft engine hardware component used in various engine assemblies as a load-distributing and spacing washer. It is typically used under bolts, screws, or fasteners to spread clamping force evenly, prevent surface wear, and maintain correct torque retention in high-vibration engine environments.

It is a standard consumable hardware item found across multiple Continental piston engine configurations and is selected strictly according to the engine parts catalog (IPC) for correct fit and thickness.

Key features include:

OEM Continental engine hardware washer
Precision-formed steel washer (0.31 in inner diameter, 0.03 in thickness)
Distributes fastener load evenly across mating surfaces
Prevents loosening under vibration and thermal cycling
Protects engine components from bolt/screw damage
Corrosion-resistant aviation-grade material
Maintains stable torque and joint integrity in engine assemblies
Compatible with Continental piston engine configurations (IPC-dependent use)
Used in accessory, intake, and structural engine assemblies
Standard component used in certified aircraft engine maintenance and overhaul