×
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

Clearance holes diameter

Clearance holes diameter

Clearance holes diameter

(OP)
I need to know what the clearance hole size is for screws that is arranged in 3 by 3 matrix. Is there something like this on machinery handbook?

thanks
APH

RE: Clearance holes diameter

What to you mean by a 3 x 3 matrix? Clearance holes for screws are usualy 1/32" larger than the screw.

RE: Clearance holes diameter

(OP)
Haggis,

I meant I have 9 screws in 3 rows and 3 colums. I'm afraid that the hole clearance for each screw is not big enough If I use 1/32" x OD of the screw.

Hope this'll be a little more clearer..

Thanks

APH

RE: Clearance holes diameter

You mean that you've got a couple of parts that are being screwed together, and you want to make sure that the screws going into holes in part (a) have clearance to pass through holes in part (b), considering tolerances, etc?

RE: Clearance holes diameter

Hole clearance is one thing.  Positional tolerances between your prime 9 holes and your 9 secondary holes are the issue, coupled with what acceptance/rejection level you are willing to live with during inspection.

Ray Reynolds
"Computers in the future may weigh no more than 1.5 tons."
Popular Mechanics, forecasting the relentless march of science, 1949
Have you read FAQ731-376 to make the best use of Eng-Tips Forums?

RE: Clearance holes diameter

(OP)
Ivymike,

You got it. That's what I want. I thought we have something like that in the machinery handbook?

thank
APH

RE: Clearance holes diameter

If you can hold .007 true position
of the holes 1/64 clearance would
be acceptable.  If you need .015
true position, then use the 1/32
clearance holes. The smaller holes
create stonger parts but greater
accuracy is needed.

RE: Clearance holes diameter

(OP)
Diamond,

Would this depend on the size of the screw also?

APH

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