Metric Din 6921 Indent Hex Flange Washer Non-Serrated Screw Ful Thread A2 Stainless

Primary use for Class 10.9 bolt is on truck cassis frames. The flange eliminates the need for a flat washer and helps compensate for a misaligned hole. When used with a proper class flange nut, the bolt system resists bolt slippage by distributing the clamp load over a wide area