They hold together everything from the most delicate watch to the largest bridge. The world is literally kept from coming apart by screws and bolts, and yet we don’t often give a thought to these ...

One of the most critical factors in determining the reliability of a threaded-fastener joint is the force the tightened fastener exerts on an assembly, which is known as preload. And preload depends ...

Screws get stuck, and it often takes ingenuity as well as elbow grease to get them unstuck. Back in the good old days, it was common practice to coat the threads of a screw with a little beeswax ...