What is allowable thread pressure?

[DavidTunnard]

Within the bolted connection design assistant there is a category for allowable thread pressure. Does anyone have any links or info on what this is? I'm struggling to find anything (that I can understand anyway!)

[DavidTunnard]

Just seen this has already been asked here

https://forums.autodesk.com/t5/inventor-forum/bolted-connection-calculation-allowable-thread-pressur...

But the links in the comments are no longer working for me

[CGBenner · Accepted solution]

@DavidTunnard 

Hi, David.  I found the same thing from the Inventor 2023 Help. Can you try this link?

[DavidTunnard]

ah, thanks. that link works.

but don't really tell me what it is. Maybe it's more of an engineering question rather than an Autodesk question. However when I google it most of the answers point specifically to the bolted connection design assistant.

[Frederick_Law · Accepted solution]

σ red ≤ S y / k s and σ max ≤ S y / k s and p c ≤ p A

It is a number user set so IV can highlight if "thread pressure" is too high.

No idea what it is and which industry use it.

I usually just use stress.

All commercial nuts and bolts has max allow load and stress.

More to read on bolts, not really about "thread pressure":

https://mechanicalc.com/reference/bolted-joint-analysis

https://www.fastenal.com/content/feds/pdf/Article%20-%20Bolted%20Joint%20Design.pdf

This one has "Surface Pressure" on page 25:

https://cdn.website-editor.net/889b226a44bd42dcad28d5b124eb6f10/files/uploaded/Training%2520Course.p...

[gho.ghorbani]

Hi David. Use below table  for "Allowable pressure in threads of connection bolts":

https://help.autodesk.com/view/INVNTOR/2020/ENU/?guid=GUID-E9B9FC7B-C218-431C-A846-3A8B1204AD96