Question Lock Nut for crossbar/H-adapter size

[SoCalDiver07]

Can anyone help me. I picked up a set of LP72 twins and the crossbar/H-adapter is missing the locking nut. I dont have a way to check the thread pitch or size to order a couple of nuts. Can anyone point me in the right direction by either supplying the nut size and thread pitch (preferably) or link to order a new set without paying $16 in shipping? I am assuming its a standardized part. Here is a pic to the part I mean. Thank you for any help.

 

[inquis]

Are you sure you need it? I leave mine loose to allow the manifold to rotate if it ever nose dives off the bench.

 

[SoCalDiver07]

Are you sure you need it? I leave mine loose to allow the manifold to rotate if it ever nose dives off the bench.

I would prefer it, I dont like the idea of my valve not being where I reach for it.

 

[Agro]

Are you sure you need it? I leave mine loose to allow the manifold to rotate if it ever nose dives off the bench.

I don't know any diver doing this and I don't think it's a good idea. These o-rings don't like beeing rotated under pressure.

If you rotate the manifold you change distance between tanks, this creates stress for the threads.

In Europe thread size is M16x1.5, one right hand, one left hand. No idea of thread size in the rest of the world.

 

[happy-diver]

Different manufacturer, different thread, about the only uniformity, are the notches in the LH nuts

My crossovers are able to be moved too as are most of the manifolds of most of the divers I know

Everything is so interesting like a kid having a blast before a fearful person introduces them to fear

link to order a new set without paying $16 in shipping?

even this place sounds interesting

 

[Agro]

I don't know any diver doing this and I don't think it's a good idea. These o-rings don't like beeing rotated under pressure.

If you rotate the manifold you change distance between tanks, this creates stress for the threads.

In Europe thread size is M16x1.5, one right hand, one left hand. No idea of thread size in the rest of the world.

I am sorry, in Europe it is M16x1, not M16x1.5. Here I never ever saw anything else but M16x1, different manufacturers.

You can only be sure by measuring. Your thread gage must be able to measure european and US threads.

 

[PfcAJ]

I don't know any diver doing this and I don't think it's a good idea. These o-rings don't like beeing rotated under pressure.

If you rotate the manifold you change distance between tanks, this creates stress for the threads.

In Europe thread size is M16x1.5, one right hand, one left hand. No idea of thread size in the rest of the world.

It was popular to leave them loose, but the downsides that you mention are significant.

Lock your crossbars, y’all. Those orings cutting loose would be not good. They are not designed to rotate under pressure.

 

[nadwidny]

It was popular to leave them loose, but the downsides that you mention are significant.

Lock your crossbars, y’all. Those orings cutting loose would be not good. They are not designed to rotate under pressure.

So George was wrong?

They may not be designed to rotate but they can, to a certain extent without failure, as I found out many years ago when I impacted a ceiling in a wreck while scootering.

I dive OC doubles maybe once or twice a year. If the current thinking is to lock them, then I will go ahead and do so.

 

[PfcAJ]

So George was wrong?

They may not be designed to rotate but they can, to a certain extent without failure, as I found out many years ago when I impacted a ceiling in a wreck while scootering.

I dive OC doubles maybe once or twice a year. If the current thinking is to lock them, then I will go ahead and do so.

He was occasionally not correct.

Occasionally.

No appreciable damage will happen to your manifold from hitting the ceiling (not that I have ever once transgressed and hit the ceiling myself, of course). I dropped a set of 104s out of my truck onto the manifold. Bent it into an S shape but it didn’t leak. A bop in the ceiling at even the fastest scooter speeds will not create the same force. But that repeated small motion of an unlocked manifold will wear those o rings.