×
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

What should the hole tolerance for a .375 DIA. dowel pin be in order to be a slip-fit?

What should the hole tolerance for a .375 DIA. dowel pin be in order to be a slip-fit?

What should the hole tolerance for a .375 DIA. dowel pin be in order to be a slip-fit?

(OP)
Hi,

I have an alloy steel dowel pin of .375 DIA. that I am inserting into an aluminum housing. Can someone help me with the hole tolerance that is needed in order for it to be a slip-fit? Any reference (URL, book, etc.) of where you found your answer is always welcome. Thank you very much!

RE: What should the hole tolerance for a .375 DIA. dowel pin be in order to be a slip-fit?

MrFrench24,

A slip fit under what conditions? Obviously, due to the CTE mismatch existing between your steel pin and aluminum bore, the fit condition will change with temperature.

As a general rule, it is usually easier to control the tolerance of a ground steel pin than a drilled/reamed aluminum hole. So bias your tolerance allowances accordingly.

RE: What should the hole tolerance for a .375 DIA. dowel pin be in order to be a slip-fit?

(OP)
desertfox,

Your post helped a lot! Thanks!


tbuelna,

It is under normal room temperature conditions, ~70 Fahrenheit. Yes I understand that it is easier to control the tolerance of the ground steel pin, thank you!

--

RE: What should the hole tolerance for a .375 DIA. dowel pin be in order to be a slip-fit?

Hi

Your welcome.

Desertfox

RE: What should the hole tolerance for a .375 DIA. dowel pin be in order to be a slip-fit?

Depends how critical the application, of course. A rough rule of thumb in the machine shop is to use a 0.3760 reamer for a 3/8 dowel pin. The pin should actually measure ~0.3752.

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

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