Simple and probably obvious fastener question

[Jeff7]

If this metric nut, M10 x 1.25 thread, is turned one full turn, how much distance will it travel down the bolt it's on? How do I find this out?

 

[spidey07]

1.25 mm

 

[Jeff7]

So that's all it is? Just the pitch?

 

[spidey07]

I don't really know. that just seemed what is intuative. could be way off base. Probably am.

 

[Jeff7]

I see. Anyone else then? Confirmation? Denial? Questions? Comments?


Yeah, seems perfectly intuitive. But a lot of things in life seem to be quite counterintuitive, except to the twisted mind(s) which conjured them in the first place.

 

[spidey07]

Originally posted by: Jeff7
I see. Anyone else then? Confirmation? Denial? Questions? Comments?


Yeah, seems perfectly intuitive. But a lot of things in life seem to be quite counterintuitive, except to the twisted mind(s) which conjured them in the first place.

i googled a few things afterwards about how metric threads are measured. So you're correct, it's not intuative. Google should have the answer though - "metric bolt thread pitch"

I'm used to "threads per inch"

 

[calvinbiss]

well, 1 full rotation is definitly equal to the pitch. i am just unsure wether or not the 1.25 is a mm measurement of pitch, which it makes sense that it is.

 

[Jeff7]

Yes, it is.

Unfortunately, this doesn't help me much. I tried out the problem using that pitch, and it's definitely not the answer the back of the book has.


Problem is to find the stress created in 4 steel bolts and an aluminum cylinder. There are 2 plates on either side of this assembly, and that's where the nuts are - on the end of one of the plates. The bolts are to be given one full turn past hand-tight, creating stress caused by attempting to compress the 4 bolts and the aluminum cylinder by (apparently) 1.25mm. The problem with this is that we didn't do any examples like this in class. Our examples dealt mainly with tension, and it was almost always single members.