×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*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.

Students Click Here

Jobs

BOLTS

BOLTS

(OP)
Hello,

I would like to be adviced on two matters about bolts.

At first where can i find a table related with the alloweded torque load for each bolt dimension (e.g. M2,M4....)and with the strenght grades(3.6,12.9 etc).

There is a small pipe with internal thread at both ends.
At the one end it is bolted a bolt and at the other end it is installed a manometer.
The pipe is filled with oil.No leakages.If we start bolt the bolt the pressure shall be increased. How can i find the torque demand related with the pressure.
Can i start with : Torque =F*p/2 where F=the axial force
p=pace.

Thanks in advance

RE: BOLTS

This sounds like a problem from college, if I tell you, will I be helping you cheat?
Anyway, the torques for threaded members can be found online, try google.com.  You'll also need to know the nut/bolt materials, coating, and any lubricant present.
To calcualate the torque, you make your force triangle.  The pressure from the fliud will be your vertical leg, the torque gets converted onto the horizontal, and friction acts along the hypotenuse.  The angles in the triangle depend on thread pitch and size.  As you torque the bolt, the reaction load from the threads creates the downward pressure on the oil/manometer.

RE: BOLTS

elpa02:  For information pertaining to your first question, try http://euler9.tripod.com/fasteners/preload.html and http://euler9.tripod.com/bolt-database/.

Browser tip for engineers:  I found out you can kill pop-ups and other annoyances, and speed up your browser on quite a few sites, by turning off javascript (called "Scripting" in IE) in your browser options or preferences.  Also, browsing with images turned off, and loading them only on the pages you desire, speeds things up, too.

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.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources