Abstract: Effective and efficient running of bolt and nut manufacturing industry demands determination of it�s optimal crew-size requirement. In this study, a model was developed to determine the number of manpower required (Q) in terms ofannual production target (�); production efficiency (P) machine efficiency (P o) and operators efficiency (P m); expected number of required man-hours (N) and the total production time (T). Data were collected from Oyeladun Manufacturing Industry, Ogbomoso Oyo State on types and number of machine tools available; working hours per day; number of working days per week. The model parameters were estimated as follows � (52,240), P (85%) and N (0.1877). The optimal number of personnel required by the organization was estimated to be six.