×
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

ASME B16.5 2013
3

ASME B16.5 2013

ASME B16.5 2013

(OP)
Is there some kind of tolerance on diameter of bolt hole. Example on a 4" 150# Flange the dimension given is .750 What would be the +- tolerance. If there is a tolerance, would it be different depending on the size?

RE: ASME B16.5 2013

This is not from the 2013, but the 2009 edition...

7.8.1 Bolt Circle Diameter. The required tolerance for all bolt circle diameters is as follows: ±1.5 mm (±0.06 in.)

RE: ASME B16.5 2013

HTNeighbors, your specified tolerance is on bolt circle dia, the OP asks for bolt hole dia.
I think the answer is in B16.5:2013 para 7.8.2:

Quote:


7.8.2 Bolt Hole to Bolt Hole. The required tolerance
for the center-to-center of adjacent bolt holes is as
follows:
±0.8 mm (±0.03 in.)

Hope this helps.

RE: ASME B16.5 2013

In re-reading the original question, I think the answer best answer would be in Table 11-7 and the following, similar tables. These tables list the diameter of the bolt hole and the diameter of the bolts. There is no tolerance given; it merely lists a bolt of 1/8" diameter smaller than the hole diameter.

In answer to the original question - I'm not aware of any tolerance acceptance for diameter of bolt holes.

RE: ASME B16.5 2013

(OP)
Thank you guys for your help.
XL8NL Doing the measerement for adjacent bolt holes would be a task to get an accurate measurement using dial calipers, but yes that would be the tolrerance.

HTNeighborsI see your point where B16.5 Table 11-7 points out diameter of bolts.

Considering the diameter of bolts given, would flange be rejectable if diameter of bolt hole is smaller than diameter of bolt?

Again thank you guys

RE: ASME B16.5 2013

Yes - if the diameter of the bolt hole is smaller than the diameter of the bolt - the bolt will not fit in the hole - this would be a reject. Not manufactured to spec.

RE: ASME B16.5 2013

Hi all,

I give my two cents to the discussion.
I noticed this detail years ago, my opinion is that hole position (bolte circle + hole-to-hole) is important since it is the basis for a good flange alignment, while bolt diameter has only to be large enough to accommodate the bolt with sufficient clearance, as the bolt is expected to carry only axial load. IMHO this is why there is no tolerance on bolt diameter.

Further suggestions?

Stefano

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