dumper wrote:The studs on the top mount are 8 mil which is usually a 13 mil nut but ford and Cummings do odd sized nuts they make them so that they have their own flat washer built in to the nut and for some applications can have teeth on the underside a act as self locking nut so with this type of nut the spanner size is 1 mil smaller this also makes easy to use different spanner’s on them .
Hear is a list of what works
12ml =half inch a/f
14 ml=quarter whitworth
18mil=three eighth whitworth
That’s all a can remember off the top of my head but as you go up the size range it works just the same also using different spanner ranges all works on pipe nuts
Seriously, You've taken that wayyyyy too far.