What is the function of anti-seize compounds, and on which surfaces should they be applied in naval fasteners?

• A. It reduces galling and eases disassembly; apply to threads of dissimilar metals or high-temperature joints as specified, avoiding sealing faces
• B. It lubricates surfaces to reduce friction
• C. It creates a permanent seal on sealing faces
• D. It is used to fasten in place with no lubricant

Answer: (A)

Anti-seize compounds are used to prevent galling and seizing of metal threads and to make disassembly easier when fasteners are exposed to high temperatures, corrosive environments, or dissimilar metals. On naval fasteners, they are applied to threaded surfaces—especially where metals differ or where joints experience high heat—so a lubricating film stays in the threads to reduce friction, galling, and corrosion, aiding future removal. They should not be put on sealing faces because any residue can compromise the seal and leak-tightness, and because the mating surfaces need clean, direct contact to form a proper seal.