The SR-71 Mach 3 spy plane is built of titanium, with titanium nuts and bolts. The sockets also have to be made from titanium, because the nickel in standard sockets corrodes the titanium bolts.

Copper alloy nuts have good load capacity ... A nut with a '6g' tolerance is the most common, with lower values indicating less tolerance, and high values indicating more tolerance for space between ...

Lamba is constantly challenging and pushing himself to think of the next difficult medium. Strings, dry pastel, even copper, corrugated sheets, and nuts and bolts have found their way to his canvas.