IIS Manufactures & Supplies Conical Contact Washer NEF 25-511

We are manufacturing Conical Contact Washer also known as Rib Washer Single Side Serrated Washer as per STD NFE 25-511 and customer requirement. This washer are conical shaped formed with plane mounting side and top serrated side. The serrated side of the washer exerts circular locking force at the internal face of the bolt head or nut. The top serrated side increases locking force and prevent the loosening of bolt during vibration & pressure