I'll give someone best answer too. What Is Mm In Measurement. A board foot is a measure of volume, but unlike cubic feet or cubic inches, the board foot is typically used in reference to a thickness measured in inches, usually one inch. What is the abbreviation for measurements? The number (8) is the nominal major diameter in millimeters over the threads of the bolt (it will actually be slightly undersize and the nut slightly oversize to fit, but they are both named M8). Favorite Answer. If so, should I put