18-8 stainless steel screws have good chemical resistance.

These screws cut threads into drilled holes as they’re turned, so they require less driving torque and cause less stress on material than thread-forming screws. Made of steel, they have an ultra-corrosion-resistant coating to resist corrosion in wet environments.

Threads change direction to cut into composites and push material back into the hole to prevent distorting the surface around the hole.