Question: This question relates to ISO tank gaskets. “What measurments do you need to make ISO tank gaskets? Is it just the diagonal bolt pattern and the size of the opening?”
Tank Guru: Usually what we need to make ISO tank gaskets is the Outside Diameter, Inside Diameter, and thickness of the gasketing material regardless of whether it is a ring gasket or a full-face gasket. Then for full-face gaskets we also need to know the number and size of the bolt holes, and the Bolt Circle Diameter. For instance, we might spec out a 3” ANSI 150# gasket this way:
7.5” OD x 3.5” ID x 1/8” thick full-face gasket with 4x ¾” holes, equally-spaced on a 6” BCD.