Evolution of threads

[coopec43]

I've sometimes wondered why I needed a 15 inch wrench (and a lot of force) to get some nuts to screw onto a bolt.

But after reading the article by Phil Edmonds I now know why.

https://www.philholdenfasteners.co.u...screw-threads/

Clive

[coopec43]

The history of the bolt

At first glance, a bolt may seem like a very simple item that holds things together. But dig a bit deeper and you’ll realise there’s more behind seemingly insignificant bolt and screws than first meets the eye. Without them, all our gadgets and machines would fall to pieces

https://www.nord-lock.com/en-gb/insi...y-of-the-bolt/

[AKA-None]

And some bolts are designed to only be used once

[coopec43]

Originally Posted by AKA-None

And some bolts are designed to only be used once

Well I didn't know that but it is a fact.
https://mechanics.stackexchange.com/...to-yield-bolts