There are multiple reasons you could be having that problem. I used stainless fasteners all the time. If they are good quality fasteners, I usually don't have any problems with them. Chinese stuff, you will be very lucky, if you don't have problems with them. More so if they are Chinese made, with standard threads. The Chinese, don't have a lot of problem with metric sizes and metric threads, but when they try to convert to standard or SAE sizes, they don't come out right. The thread pitch will always be wrong. They seem to try and use a metric thread pitch that is close to SAE thread pitch and call it good. This problem exists with any Chinese fasteners, the exact problems vary from source to source. When they make stainless fasteners, thing can get very bad.
Even with US made stainless fasteners, you should never use air tools, the speed creates heat, which can cause galling. Of US fasteners or European stuff, there are various levels of quality, some will still have a high possibility of galling, the best stuff, is noticeably better, much less problems. If you are using some of the lower quality stuff, go slow and use some form of lube on the threads.
Also if you are using nuts from one source and bolts from another, and one source happens to be Chinese, you most likely won't have the same thread pitch for both fasteners, if they are supposed to be standard or SAE fasteners. The all metal lock stainless lock nuts are a very high likely hood of galling, more so if Chinese. Unless they are US made aircraft fasteners or high quality US made fasteners for turbo related exhaust systems, which are probably just US made aircraft fasteners.
I would go buy a different brand of fasteners, if it was me, buy from a bolt company, if you need stainless fasteners. Then no air tools.
Even with US made stainless fasteners, you should never use air tools, the speed creates heat, which can cause galling. Of US fasteners or European stuff, there are various levels of quality, some will still have a high possibility of galling, the best stuff, is noticeably better, much less problems. If you are using some of the lower quality stuff, go slow and use some form of lube on the threads.
Also if you are using nuts from one source and bolts from another, and one source happens to be Chinese, you most likely won't have the same thread pitch for both fasteners, if they are supposed to be standard or SAE fasteners. The all metal lock stainless lock nuts are a very high likely hood of galling, more so if Chinese. Unless they are US made aircraft fasteners or high quality US made fasteners for turbo related exhaust systems, which are probably just US made aircraft fasteners.
I would go buy a different brand of fasteners, if it was me, buy from a bolt company, if you need stainless fasteners. Then no air tools.
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