Flange bolt & gasket BOQ calculator
Add your flanged joints by size and class to get the total stud bolts, heavy hex nuts and gaskets, grouped by stud diameter.
Bolting BOQ
| Stud diameter | Studs | Heavy hex nuts | Nut spanner A/F |
|---|
One joint = one pair of mating flanges = one gasket. Stud length depends on flange type, facing and gasket — check ASME B16.5 Annex or the project bolting table.
Frequently asked questions
How many bolts does a 6 inch Class 150 flange need?
8 stud bolts of 3/4 in diameter with 16 heavy hex nuts.
How many nuts per stud bolt?
Two heavy hex nuts per stud bolt on a flanged joint.
Last updated 2026-11-02