The most useful thing I've found for such tasks is a cheap set of dies and taps. They won't need to remove much metal so you don't need top-of-the-range stuff. Plus you'll be scraping dirt out of the threads, so there's no point blunting good quality kit.

There are a lot of suppliers that will let you buy small-ish quantities of nuts and bolts, in various metal compositions, and they usually arrive in the post the next day, at a reasonable price, so I just buy what I need for particular jobs. For example from Kayfast mentioned above. Occasionally, I've used a generic set screw just to put stuff back together quickly and then put a suitable bolt in when it arrives.
 
Easy way to restore original bolts nuts etc
Use one of the wife’s less expensive cake dishes preferably aluminium turn it upside down drill out to suit an electric motor 12 volt will do, mount it up so it vibrates with an offset weight on the output shaft. Put in some unused cat litter drop in bolts etc put lid on and let it run. Go to pub.
 
Easy way to restore original bolts nuts etc
Use one of the wife’s less expensive cake dishes preferably aluminium turn it upside down drill out to suit an electric motor 12 volt will do, mount it up so it vibrates with an offset weight on the output shaft. Put in some unused cat litter drop in bolts etc put lid on and let it run. Go to pub.
Should have added , there are better instructions on YouTube. When caught with said dish by wife deny all knowledge blame the dog and go to pub
 
Ultra-sonic bath with vinegar and water, then wire-brush, rust-eater after that then protective coatings.
 
Put them in a bath with a mix of black molasses and water, 1 to 9. It takes a longish while but the mix only eats the rust, leaves the good metal behind.
And no, I didn't believe it either until I tried it on a socket set that had been left to rust in a rainsoaked car with no roof.
You just need to oil them as soon as they come out of the bath. Its called "chelation" by the way.
Plenty on it here
https://www.google.com/search?q=usi...rome..69i57.8825j0j8&sourceid=chrome&ie=UTF-8
And you don't have to spend ages cleaning yucky black stuff of it afterwards as you do with other methods.
Each to their own!:):):)
 
Put them in a bath with a mix of black molasses and water, 1 to 9. It takes a longish while but the mix only eats the rust, leaves the good metal behind.
And no, I didn't believe it either until I tried it on a socket set that had been left to rust in a rainsoaked car with no roof.
You just need to oil them as soon as they come out of the bath. Its called "chelation" by the way.
Plenty on it here
https://www.google.com/search?q=usi...rome..69i57.8825j0j8&sourceid=chrome&ie=UTF-8
And you don't have to spend ages cleaning yucky black stuff of it afterwards as you do with other methods.
Each to their own!:):):)
He tells you the naturally occurring acid in the vid. Its cheaper than molasses ;)
 

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