Brake Line Nuts
 

This may seem like a simple question for someone who knows but I have been searching the web for an hour trying to find the answer.

M10 x 1.0 nut VS. M10 x 1.0p nut
What does the p stand for ?

I'm thinking something to do with the thread size or pitch but not exactly sure what the difference is.

Thanks in advance

I tried google and stuff, but I can't answer your question.

However, I found this on the net.

http://www.boltscience.com/pages/glossary.htm#t

There is an email option there, you might want to ask the question to one of them?
If you do, please post the reply, you got me curious too :D

I also found this:
http://www.stagonset.co.uk/pictures_..._HexNy_M10.jpg
and this:
http://www.stagonset.co.uk/pictures_...NyHigh_M10.jpg

It's a Type P and Type T nut. All I can see is the P nuts are higher? more threading?

I hope you find the answer :)

If I had to guess, the p is indicating that the second number is the thread pitch (distance between threads) versus the number of threads per unit length.

M10 x 1.0...........the 10 is the diam and the 1.0 is the pitch (thread-to-thread distance) in mm.

Don't know what the p would be for, but I doubt if it is pitch since the pitch is already specified.

George

Right, I was saying that perhaps the p is just to note that the "1.0" is the pitch, since the second number is sometimes the threads per unit length. In this case, 1.0 threads per mm is the same as a pitch of 1.0, but if it were 2.0, it would matter, since 2.0 threads per mm is a .5 pitch (I think - I'm by no means an expert on this subject).

I would say they are both the same.

Could the 'p' indicate a pipe thread?

With metric designations whatever comes after the pitch would typically be the tolerance class for that size, however a 'p' tolerance class doesn't exist (at least as far as I know of). Typically you'll see a '4h' or a '6g' or something like that.

Something to keep in mind also is that in the metric world they do use straight pipe instead of taper threads more than us yanks do.

With all of that being said through, I'd guess that it's simply the pitch, as suggested above.

In the metric world, they do not indicate pitch the same way we do. A pitch of "1" simply means that it measures 1mm from crest to crest on the thread profile. Whereas, the Imperial system measures the number of threads over a given measurement. So, your 2.0 pitch would be twice as coarse as a 1.0 would be.

Thread pitch is the angle of the threads,nothing to do w/threads per unit. British and or metric pipe threads are designated by a P for parallel or T for tapered.

Wrong, dude.....

The pitch is the distance in mm from a point on one thread to the same point on the next thread....as correctly stated above by George and others.....

I'm sure that its safe to say that M10 x 1.0 & M10 x 1.0p are the same thing.
The p stands for pitch and its just redundant that sometimes they put it in there and sometimes they don't.

Thank you one and all.