DIN 6921 Class 10.9 Metric Flange Bolt Screw Non Serrated Black Phosphate
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
