Noise induced hearing loss is the commonest occupational health hazard next only to accidents .Objectives of the present study were to study the characteristics of hearing loss and assess the prevalence of hearing loss in workers of lock factories. The study group included 114 workers employed in different sections of lock factories namely Power press, Lathe machine, Grinder and Hand press units. Fairly high and potentially damaging noise levels were recorded in all the sections of lock factories. Various hearing tests and audiometric test were performed to assess the hearing loss. Result of the present study indicates that hearing impairment are commoner in workers continuously exposed to high levels of occupational noise.