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Кованая круглая и квадратная сталь (по ГОСТ 1133-71 в ред. 1991г.)

Диаметр или сторона квадрата кованой стали, мм: 
40; 42; 45; 48; 50; 52; 55; 58; 60; 63; 65; 68; 70; 73; 75; 78; 80; 8З; 85; 90; 95; 100: 105; 110; 115; 120; 125; 135; 140; 145; 150; 155; 160; 165; 170; 175; 180; 185; 190; 195; 200. 

Примеры обозначений:
круглой стали марки У10 диаметром 40 мм:

квадратной стали марки У12 со стороной квадрата 60 мм;

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