ISO 10512 - 1997 1型细牙六角尼龙锁紧螺母 6级、8级、10级 Prevailing torque type hexagon nuts(with non-metallic insert),style 1, with metric fine pitch thread—Property classes 6,8 and 10
ISO 12125 - 1997 细牙六角尼龙法兰锁紧螺母 A级、B级 Prevailing Torque Type Hexagon Nuts With Flange(With Non-metallic Insert) With Metricfine Pitch Thread - Product Grades A and B