Flo said:Aluminium?
I would be afraid they would break & leave the thread in the head. Most parts made for motorcycles are made from soft aluminiums such as 6061 or 6082. If they were made from aircraft grade such as L168 or a 7075, then maybe.
geo46er said:The ones on my 74 are chromed steel and there is no problem.
However, I suspect that for what you are going to pay to have yours
chromed (or rechromed) you could probably buy new ones anyway.
Look into some bronze exhaust nuts, they supposedly work the best.
ZFD said:Current Andover Norton nuts are bronze, then chromed, part#06-3988, but you can also have the unchromed bronze ones (cheaper) under 06-3988/1. They were chromed steel originally, which is not as good expansionwise, so the steel ones are getting loose as the head heats up. If you insist on original steel ones I am certain Nick Hopkins of Andover Norton will do you some NOS shop soiled ones at a very good price...
DogT said:Nolts
According to ZFD, the current AN 06-3988 exhaust nuts/bolts/roses/lockrings/hollow screws :roll: are now chrome plated bronze.
hobot said:Norton Lock rings! Yeah right and Combat had 65 hp. Least the fork 'nuts' aren't no hollow bolts eh.