ISO 10512 - 1997 1型細牙六角尼龍鎖緊螺母 6級、8級、10級 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 細牙六角尼龍法蘭鎖緊螺母 A級、B級 Prevailing Torque Type Hexagon Nuts With Flange(With Non-metallic Insert) With Metricfine Pitch Thread - Product Grades A and B