The results of buckling tests on 41 small-scale ring stiffened steel cylinders and one large radius fabricated ring stiffened steel cylinder under axial compression are presented. These results are compared with those of many other investigators on both stiffened and unstiffened cylinders. Elastic buckling coefficients are determined for both small scale and fabricated cylinders. A plasticity factor is determined from test data on cylinders which failed inelastically. Design equations are recommended for fabricated metal cylinders.