Grade 10.9 M8 Alloy Steel Serrated-Flange Hex Head Bolts
Good for demanding applications such as suspension systems, these screws are about 10% stronger than medium-strength steel screws. Serrations under the head grip the material surface for mild vibration resistance,and the flange distributes pressure where the screw meets the surface, eliminating the need for a separate washer. The black-oxide finish provides mild corrosion resistance in dry environments. Head height includes the flange. Length is measured from under the flange.