The SA640612 washer is an aircraft engine hardware component used in Continental-compatible piston engine assemblies. It serves as a load-distribution spacer between fasteners (such as bolts or nuts) and mating engine surfaces.

Its primary function is to spread clamping force evenly, prevent surface wear, and maintain correct torque retention in high-vibration engine environments.

Key features include:

PMA aircraft engine washer
Precision-formed steel or corrosion-resistant alloy (variant dependent)
Distributes load under fasteners
Prevents galling and surface damage
Helps maintain correct torque and joint stability
Designed for high vibration and thermal cycling environments
Compatible with Continental piston engine assemblies (model-dependent IPC use)
Used in engine accessory, case, and structural assemblies
Standard consumable hardware in aircraft maintenance and overhaul
Aviation-grade fastening support component