1.1 ,In the interest of uniformity and quality, the aerosol industry has developed dimensional guidelines which are suggested for U.S. three-piece steel and tin-plate aerosol cans of straight-wall and necked-in design. Domestic can makers uniformly agreed to comply with these guidelines and were instrumental in their development. A series of standard methods and gages were also developed to uniformly determine specific dimensions. The tolerances established for these dimensions allow for can manufacturing and filling process variations.