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


Mechanical Spring Representation

Mechanical Spring Representation

Mechanical Spring Representation

I'm running up against a wall in specifying the standards for information that needs to be included on an engineering drawing of a spring. So I thought I'd ask the experts. I have done a search and checked the FAQs, but I haven't found anything yet. ANSI Y14.13M used to be the standard, but it was rescinded. Is it MIL STD 29A? Surely I'm missing something obvious.


Dan's Blog

RE: Mechanical Spring Representation

Check this link and go to page 4 it shows you how and what to specify for a compression spring:-


“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein

RE: Mechanical Spring Representation

I am not familiar with a standard for specifying a spring. But MIL-STD-29A gives what is necessary to include in the drawing. However, remember to ask only for what is necessary and give the spring manufacturer the maximum allowed freedom to "play" with free length and outside/inside diameter, meaning the largest tolerances you can allow. However, wire diameter which dictates the spring wire strength should be strictly defined. Remember, that spring is coiled and not machined therefore, allow a +/-10% tolerance for the spring force at a specified compressed length/s.

RE: Mechanical Spring Representation

Thanks, fellas. That's what I thought. I'll just cherry pick the pertinent information from old standards for what I want to see on drawings. Why did ANSI drop the spring standard, I wonder?


Dan's Blog

RE: Mechanical Spring Representation

Hi Eltron

You're very welcome.

“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein

RE: Mechanical Spring Representation

What information you include will depend on the type of drawing format and how the spring is procured. For example, a spring manufactured to your specific requirements by a qualified/approved vendor would require a source control drawing (SCD), which can be quite detailed. A spring that can be purchased as is from a list of approved sources would require a vendor item control drawing. A spring that is purchased as is from a vendor and then modified in some way for your application would require an altered item drawing.

If you intend to purchase a custom spring using a SCD, work with your vendor to ensure they are comfortable with everything specified on your drawing before releasing it. But also make sure your final SCD explicitly defines every detail so there is no confusion over the finished product your vendor needs to deliver.

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!


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