With a series of flexible ribs or fins extending laterally from the

Official title: {with a series of flexible ribs or fins extending laterally from the shank of the stud, pin or spigot, said ribs or fins deforming predominantly in a direction parallel to the direction of insertion of the shank}

F16B21/084 (With a series of flexible ribs or fins extending laterally from the) appears on 142 US grants and 128 published applications in this corpus.