Abstract: This paper focused on the overview of failure analysis of high tensile fasteners. An industrial fastener comprises a very wide range of items like nuts and bolts, washers, studs, nails etc. Nuts and bolts are used for fastening purpose in industries where the replacement of pieces and the parts is necessary. Although, fastener is a low cost class C item but fastener failure is undesirable as is the first item that gets the blame when there is a failure, aftereffects of fastener failure are cumbersome which cause financial loss to machine & process. Hence, the cause of failure is understood & eliminated.