×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

#### Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

# Calculate tension in torqued bolt6

## Calculate tension in torqued bolt

(OP)
How do I calculate the tension in bolt based on the torque applied?

### RE: Calculate tension in torqued bolt

(OP)
@GBTorpenhow - Can I use it for Stainless Steel bolts connected to SS plates ?

Yes.

### RE: Calculate tension in torqued bolt

Except that stainless steel may have wildly different coefficients of friction due to galling. If you need to have an accurate tension with stainless steel I suggest using torque to yield or torque to angle depending on the rigidity and variability of the joint.

### RE: Calculate tension in torqued bolt

Patelam,

You can only get a range of numbers which by the look of the link is a factor of 3. That sounds about right.

Torque to tension is dependent on a number of factors which are difficult to control or determine. If you want definitive tension then use a hydraulic bolt tensioner.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

### RE: Calculate tension in torqued bolt

Without knowing it, you're guessing numbers, and will only find a range like LI mentioned. Practice is you'll only find it by testing, and it only applies when the variables affecting K-0factor, dont change

Huub
- You never get what you expect, you only get what you inspect.

### RE: Calculate tension in torqued bolt

2

#### Quote (XL83NL)

and it only applies when the variables affecting K-0factor, don't change

And that's about as rare as rocking horse shit....

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

### RE: Calculate tension in torqued bolt

Attached is some info about the threshold galling stress of various SS combinations in contact and sliding.
From a mere 2ksi to over 50 ksi.

For a cranky combo of SS fasteners, material hardness and smoothness of the threads can only do so much.

I don't remember the materials, but a precision spindle company made some SS spindles for a centrifuge or something. We routinely made gorgeous precisely ground threads in many ferrous materials.
Basically as soon as there was ANY load on the locknut when beginning to tighten against the bearing preload, the nut seized HARD to the spindle threads.
The nut simply had to be cut for removal.

#### Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

#### Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Close Box

# Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!