This website contains age-restricted materials including nudity and explicit depictions of sexual activity.
By entering, you affirm that you are at least 18 years of age or the age of majority in the jurisdiction you are accessing the website from and you consent to viewing sexually explicit content.
“Machined” doesn’t mean “homemade”, it’s a manufacturing method meaning that the threads of the bolt/nut were cut from a smooth piece of metal (as opposed to being cast or forged from a mold). Machined hardware is more likely to have defects like tiny nicks in the threads or bent threads that can damage/ destroy whatever you’re using it to fasten. You can usually tell pretty quickly if you’ve got a shitty bolt or nut if you’re threading it by hand - any irregularities are easy to feel. But if you just blast it with a power drill right off the rip, you won’t feel any of it, and might end up with an unplanned permanent fixture.