Here's how they compare. Also called lag bolts, these old workhorses are easily identifiable by their large, hexagonal heads. They're typically larger than most wood screws and fasteners because ...

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.