Flat Washers are made from Nylon 6/6 a high-viscosity nylon that exhibits a great deal of strength and resistance to temperature extremes making this material ideal for chemical and electrical applications. And because nylon is non-corrosive antimagnetic and resistant to friction and vibration these washers can withstand a good deal of wear and tear and movement without becoming damaged or compromised. If you already have a washer and you are trying to match it measure the inside then look for a size slightly smaller that your measurement. For example the inside measurement of the washer you measured is approx 6.50mm you need to look for a M6 washer. If the washer measured 17.25mm internally then you need a M16 Washer. It offers excellent filling qualities and hence is easily moulded even into very difficult long shapes such as threaded rod. It provides good toughness tensile strength and resistance to creep particularly in the high temperature range. Nylon has excellent wear properties low coefficient of friction and exceptional chemical resistance to aromatic hydrocarbons greases and oils. Nylon is a hygroscopic material which tends to absorb water or moisture from the surrounding environment. The amount of absorption will depend on the environmental conditions. When water or moisture is absorbed by Nylon it behaves like a plasticizer in plastics reducing the tensile strength stiffness; and increasing elongation impact strength and energy absorbing characteristics. Outdoor weathering can be improved by the addition of carbon black. All material is advisory only and its use by anyone is entirely voluntary. Reliance on it for any purpose by anyone is at the sole risk of that person and Bolt and Nut Australia is not responsible for any loss claim or damages arising therefrom.