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!

*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

ASTM A358 Out-of-Roundness

ASTM A358 Out-of-Roundness

ASTM A358 Out-of-Roundness

Dear All,

I'am confused about the Out-of-Roundness description in ASTM A358.

My understanding is following:
Out-of-Roundness (ODmax - OD min) ≤ OD*1%, for instance, pipe norminal OD is 168mm, and after measuring, the ODmax is 168.8mm and ODmin is 167.9mm, so the out-of roundness=(168.8-167.9),which shall not exceed 168*1%

Is my understanding correct?

Thanks in advance.

RE: ASTM A358 Out-of-Roundness

The OD is the average OD, such as you would measure with a pi tape.
The ovality (out-of-round) is comparing min and max point diameters at any one cross section.
So with 168mm nominal OD the average can be +/-0.8mm from that.
If you use a micrometer and check at any given the location the min/max readings must be 166.3 - 169.7mm

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy

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! Already a Member? Login


Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now
The Great Project Profitability Debate
A/E firms have a great opportunity to lead the world into the future, but the industry’s greatest asset—real-time data—is sitting wasted in clunky, archaic ERP platforms. Learn how real-time, fully interactive dashboards in a modern ERP allow you to unlock data that will shape the future of the world. Download Now

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:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close