"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Hex wrenches, also known as Allen keys, are the tools you use to screw and unscrew fasteners that have a ...

Few fasteners can beat threaded ceramics nuts and bolts when it comes to withstanding heat, pressure, and corrosive environments. Just don't torque them too tight. Back in the late 1980s, I had my ...