Bolt Tension Standard 1

[HarySahata]

Hi all,

I have a question for bolt tensioning and preload required for bolt connection.
how can we determine preload for bolt connection? i.e. we use ASTM A193 Grade B7 stud bolt for flange connection.
I thought the bolt must be tensioned to 70% its yield strength (as i read in many blogs), but is there any standard that mention the required preload (stress) of the bolt?

Thanks.

 

[NBrink]

I'd recommend reviewing ASME PCC-1.

While a lot of folks specify some % of yield across the board (50% being pretty common), that won't necessarily be the right number for all joints.

Nathan Brink

 

[SwinnyGG]

I thought the bolt must be tensioned to 70% its yield strength (as i read in many blogs), but is there any standard that mention the required preload (stress) of the bolt?

Your question and answer are both contained in this sentence.

70% of yield strength is a level of preload.

Whether or not that is appropriate for the joint you're designing, is up to you.

 

[HarySahata]

I'd recommend reviewing ASME PCC-1.

While a lot of folks specify some % of yield across the board (50% being pretty common), that won't necessarily be the right number for all joints.

Thanks for the great answer.

Your question and answer are both contained in this sentence.

70% of yield strength is a level of preload.

Whether or not that is appropriate for the joint you're designing, is up to you.

hehe, it's mentioned in blogs. i have to make myself clear with the standard. thanks anyway.