Washers have a round hole and are also called washers, for example. These washers are preferably used together with hexagon head screws, machine screws, nuts, threaded rods, self-locking nuts, spring washers and body washers for Allen applications in steel and wood construction, as well as protective elements for surfaces. The mechanical characteristics of NBR include high abrasion resistance, good tensile and tear strength and low compression set. With regard to the thermal properties, the elastomer is temperature-resistant between a maximum of -30 °C and +120 °C - depending on the specific composition and the proportion of acrylonitrile. If the acrylonitrile content is rather low, the resistance to oils and fuels is reduced. On the other hand, the material is significantly more flex.
