ASME/ANSI B18.2.4.6MMetric heavy hex nuts
GB/T 1229Hexagon nuts for high strength structural bolting with large width across flats—Property classes 8 and 10
GB/T 18230.3Hexagon nuts for high-structural bolting with large width across flats—Property classes 8 and 10
ISO 4775Hexagon nuts for high-strength structural boltinig with large width across flats—Property classes 8 and 10
JG/T 5057.25Construction machinery and equipment High strength large hexagon nuts