×
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/nuts

bolts/nuts

bolts/nuts

(OP)
Is there any asme code that specifies which way the nut has to be on a bolt, is there such thing as a backword/upside down nut? I know the material/grade should be showing when checking a bolt up connection. I'm just wondering if 1 nut out of 45 is backword (not showing 2H) is this good reason to reject bolt up?

RE: bolts/nuts

Nuts typically have a bearing surface as do bolts. That should be the point of contact or interference. It depends on the application as to weather a nut on the wrong way would warrant rejection of an entire part of the job. But I have seen it do so before.

RE: bolts/nuts

I can't recall where I read it, but it was from a source I considered reliable: The bearing capacity of a 2H nut is unchanged from the 'washer face' to the '2H' side. Only if calibrated torque is being used to install the nuts, AND the nut is the turned member AND the calibrated torque is very close to the minimum allowable torque of that lot of bolts to achieve the minimum pretension, does it become a problem.

It is just a 'workmanlike appearance' item, like facing all the bolts the same way and using all the same length bolts in any given connection. And nobody can see it from the ground, nor after the painters roll on the usual 10-30 mils of goopy touch-up paint. IOW, these items only get rejected if the Inspector is 'green' or is having a bad day; or most likely is upset about the lackadaisical attitude and inattention-to-workmanship items of the bolt-up crew(s).

. . . Got The Tee-shirt [both a 'green' one and a "lackadaisical" one.

RE: bolts/nuts

Wow! that's a pretty different attitude,I am surprised! Shouldn't the 'nut' always be the turned member? Unless, of course it becomes a captive 'nut'? I know we measure the torque from 'nut' side only? I would have thought that it was good engineering practise to set up and maintain a bolting regime that conformed at least to best practise and standard minimums!

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