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</html><thumbnail_url>https://growermetal.com/wp-content/uploads/2021/10/Tipo-DIN-6797-J-dentatura-interna.jpg</thumbnail_url><thumbnail_width>550</thumbnail_width><thumbnail_height>550</thumbnail_height><description>Internal toothed washers with geometry according to the standard DIN 6797 have small sharp and twisted teeth that extend inward from the inside edge of the washer and, when compressed, indent the bearing surface and the bolt&#x2019;s underhead to provide a discrete antiloosening effect. These washers are recommended when the head of the bolt is [&hellip;]</description></oembed>