For flanges with 36 bolts, tighten the bolts in
groups of 3 adjacent bolts following the sequence for a
12 bolt flange.
For flanges with
40 or more bolts, tighten the bolts in adjacent groups of 4, bolts
sequenced as the number of bolts divided by 4. Follow this same rule
for all flanges with 40 or more bolts. The best source for guidance
in the matter of bolt tightening sequence for flanges is ASME PCC-1. To obtain a full copy of ASME PCC-1, latest
edition, go to
For more information
about Flange Make-up, Standoff / No Standoff and Drift, Click Here.
To learn about
how much stud should extend above nuts, Click Here.
To learn about
bolt tension for surface and subsea make-up, Click Here.
For a Catalog for Bolts,
Nuts, Ring Gaskets and Wrenches, Click Here.
Information above, and in other
parts of this Web Site, may help persons who really seek to know. If you
have a question, and you think WOODCO USA may have the capacity to answer
it, please use our
Contact Us link and give us a
chance to help.
provides Web Site Tools for identification, estimating, and reference only. Do
not use this information for manufacturing or inspection. Users of these tools
should not use them as a substitute for professional engineering advice.
Anyone making use of the information presented does so at his own risk and
assumes any and all liability resulting from such use.
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