×
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

Switching form rev. numbers to letters, which letters to use

Switching form rev. numbers to letters, which letters to use

Switching form rev. numbers to letters, which letters to use

(OP)
My company is now switching from revision numbers to revision letters on our engineering documents. Numbers will now be used to track design revisions before documents are released. After they are released we will use letters to track revisions. My question is, are all the letters of the alphabet accepted for revisions? I was told that some might not be accepted. If so does any one know why they are not used?

RE: Switching form rev. numbers to letters, which letters to use

You should not use I, O or Q.  The reason is they might look too similar to 1 and 0.

"The attempt and not the deed confounds us."

RE: Switching form rev. numbers to letters, which letters to use

ASME Y14.35M-1997, "Revision of Engineering Drawings and Associated Documents" states the following for the the use of revision letters:

"5.1 Revision Letters
Upper case letters shall be used in sequence beginning with A and omitting letters "I," "O," "Q," "S," "X," and "Z'. When the single letters have been exhausted, the revisions following "Y" shall be "AA," "AB" through "AY". Should "AA" to "AY" be exhausted, the next sequence shall be "BA," "BB," etc. Revision letters shall not exceed two characters. Initial issue of a drawing does not constitute need for a revision letter and may be indicated by the use of a - (dash).symbol."

Hope this helps

GDTGUY

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


Resources

White Paper - A Guide to 3D Printing Materials
When it comes to using an FDM 3D printer effectively and efficiently, choosing the right material at the right time is essential. This 3D Printing Materials Guide will help give you and your team a basic understanding of some FDM 3D printing polymers and composites, their strengths and weaknesses, and when to use them. 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