UNI 6419 - 1969 方螺母 Square Nuts for Manufacture of Railway and Tramway Rolling Stock - ISO Metric Coarse Thread - Finish C
UNI 5597 - 1965 方螺母,ISO公制粗牙螺紋,C級 Square Nuts. ISO Metric Coarse Thread. Finish c. Dadi Quadri Normali. Filettatura Metrica ISO a Passo Grosso. Categoria C.