螺母 ? 非金属嵌件六角法兰面锁紧螺母 Prevailing torque type hexagon nuts with flange(with non-metallic insert) DIN EN 1663 | 代替 DIN 6926 ? 非金属嵌件六角锁紧薄螺母 Prevailing torque type hexagon thin nuts (with non-metallic insert ) DIN EN ISO 10511 | 代替 DIN 985 ? 钢结构用—大六角螺母 Steel hexagon nuts with large widths across flats for high - strength structural bolting DIN 6915 ? 塑料六角螺母 Plastic hexagon nuts DIN 34814 ? 六角