Exhaust nuts ~ Chromed?

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Is there any point in getting the finned exhaust nuts chromed or does this point get too hot for chrome plating?

Thanks
BC
 
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.

GB
 
I like calling them exhaust or header 'roses'. They got Al at less than 400'F surrounding them and they've a lot more metal than thin wall pipes so might not blue any at all. Do it and let us know what we're missing out on.
 
And some call them "bolts" since they do have threads on the OD and screw INTO the head.
Nuts, are internally threaded and screw ONTO externally threaded fasteners.

Per Norton--they are called Lockrings.
 
Norton Lock rings! Yeah right and Combat had 65 hp. Least the fork 'nuts' aren't no hollow bolts eh.
 
Hey--the Brit engineers named it a lockring---I didn't. I thought this forum was intended to bring out the most correct attributes of the Norton mystique.
 
Proper term would probably be "hollow screws".
Bolts are not threaded all the way up, screws are.
We make a similar part for our oil exploration kit & they are called rotating nuts, well they are short like a nut I suppose.
I prefer the bronze ones myself.
 
Does anyone have any experience with the aluminum ones that have been on E-Bay. Would there be a problem with galling, or is that not an issue. It seems that they would expand at about the same rate and not come loose. Cj
 
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.
 
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.

Sorry to disappoint you, but the alloy ones vibrate loose just the same as cast ones, that I had to drill small holes in them and the barrels to use lockwire to prevent them coming loose.
 
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.

According to ZFD, the current AN 06-3988 exhaust nuts/bolts/roses/lockrings/hollow screws :roll: are now chrome plated bronze.
post89015.html
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...
 
Ms Peel is on a severe diet and heat dump helpers so gets Al lock ring rose screw 'nolts' that will be slathered in pink Milk of Magnesia and held half way tight in head by springs not safety wire.
 
The PO had a novel idea on my 750.
They have been drilled & tapped through the thick bits, & grub screws put in & screwed against the exhaust pipe. Seems to work very well.
 
According to ZFD, the current AN 06-3988 exhaust nuts/bolts/roses/lockrings/hollow screws :roll: are now chrome plated bronze.

Yes, and if you so desire you can have them in bronze unfinished (part number with /1 behind it, say 06-2464/1).

Joe/Andover Norton
 
hobot said:
Norton Lock rings! Yeah right and Combat had 65 hp. Least the fork 'nuts' aren't no hollow bolts eh.


Actually, not meaning to be argumentative here Mr. Hobot, but the fork "nuts' you have refered to here are called "Fork Top Tube bolts"--I recon due to the same Brit engineer who named the exhaust lockring. Maybe this is why some folks receive the wrong parts when they place orders to vendors in England with out supplying the part numbers---just as thought.
 
I'd reckon that most English suppliers would know exactly what you meant if you asked for "Exhaust nuts" or "Fork Top Nuts", just as they'll know what is meant by a "swinging arm" when you mean a "pivoting fork" or when you use the plural "forks" when you mean only one. We're practical motorcyclists, not engineering pedants. :roll:

The Fork top nut in particular is threaded on the inside and the outside. What is the order of precedence ?

To my mind, if it's got a hole through the middle then it's a nut (or an arsehole and that's not applicable in this case :) )
 
Just refering to the part nomenclature used in the OEM parts manuals---along with some "Colonial" Yankee humor---geez---talk about stiff upper lips.
 
You're absolutely right about the need to use part numbers. Generally my normal conversation is peppered with 04- and 06- sequences.

You're wrong about the stiff upper lip though , Old Boy. I attacked a very decent bottle of Caol Ila at about 19.30 hours and I'm only capable of dribbling and rambling by this time in the evening.

If we're discussing Norton specifics, their parts books from the 1920s and 1930s refer to bolts and screws as "pins" . I've never come across this as a term for threaded fasteners in any other context and wonder if this is some sort of Black Country dialect term ?
 
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