The Finite Element Analysis is used in the investigation of large deformations of thin cylindrical tubes subjected to diametrically opposed point loads about the mid-length, with unrestrained ends. The dimension of the tube being modelled were 76.2 mm O.D. x 1.2 mm wall with lengths of 1.6, 4, 6 and 10 diameters. The objectives of thr study are to report on the main characteristics of large deformations involving plasticity and strain hardening. The results show that the load-deflection response is non-linear in all cases with no tendency for 'snap-through' behaviour. For the three longest tubes, the initial collapse load occurs in the early stages of deformation and at the same load. Beyond this point, an increase in length corresponded with an increase in load. The results for the shortest tube, however, display buckling behaviour. The results of the 10D tube show stationary and travelling plastic hinges at the central cross-section and generators. Generally, bending strains dominate in the circumferential direction; whilst in the longitudinal direction, membrane strains were dominant.