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The last few threads in the nut has a slightly smaller pitch making it like a crimp, so cannot come undone form vibration and can be used as many times as possible. Would this pass IVA?
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From memory these are called k nuts and were originally for aerospace use.Personally i would use suggest using normal nuts when test fitting parts and then use the nylocs for the IVA as i dont know about the inspector being able to tell the difference,use the k nuts for manifolds etc.
Another thing to note also is your bolts need to be rated as 8.8 tensile strength and BZP bolts have a higher strength than the equivelent stainless ones.