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BOLT TIGHTENING SEQUENCE FOR FLANGES USING 12 BOLTS.

Lubricate bolt and nut threads and nut bearing face (where it contacts the flange).

After flange assembly and all nuts have been run down by hand, start wrench tightening following the sequence of the numbers indicated (marking the number on the flange with a crayon aids in keeping track of the tightening process).

During all of the following steps, keep any gap between flanges even all around the circumference, and nuts made up approximately the same amount on each end of the bolt.

  • First time around just snug the nuts with a hand wrench.

  • Second time around tighten the nuts firmly with the same wrench.

  • Third time around apply approximately 25% recommended torque.

  • Fourth time apply approximately 75% of recommended torque.

  • Fifth time around, apply 100% of recommended torque.

  • Continue tightening nuts all around until nuts do not move under 100% recommended torque.

  • If possible, re-torque after 24 hours. Most of any bolt preload loss occurs within 24.

 Revised: 06/11/2012

For a Flange Gasket, Bolt and Torque Reference Chart Click Here.

For more information about Flange Make-up, Standoff / No Standoff and Drift, 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, or need a quote, please use our Contact Us link and give us a chance to help, and send WOODCO USA some business.


WOODCO USA 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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