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Aim: To evaluate the crazing of preformed stainless steel crowns by two different temperatures of autoclave sterilization. Materials and Method: 15 stainless steel crowns (3M ESP) were divided into 3 groups namely Group 1(G1) which was taken as control, Group 2(G2) which underwent Steam autoclaving at 121΀c, 15psi pressure for 20 minutes and Group 3(G3) which underwent Steam autoclaving at 132΀c, 30psi pressure for 8 min. The changes on the vestibular surface were then scored for presence or absence of crazing by using stereomicroscopy. The data was then analysed. Results: In control group the surface was relatively smooth when observed under stereomicroscope. However, in Group 2 cracks involving one-third to one-half of the surface were seen under stereomicroscope. Similar results were obtained in Group 3. Conclusion: Technique of steam autoclaving of sterilization has harmful effect on the surface of stainless steel crowns.