GB/T 18230.1-2000
栓接结构用大六角头螺栓 螺纹长度按GB/T 3106 C级 8.8和10.9级
Hexagon bolts for high-strength structural bolting with large width across flats(thread lengths according to GB/T 3106)-Product grade C-Property classes 8.8 and 10.9
GBT18230.1-2000, GB18230.1-2000