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  Surface quality classes for Bright Steel Products extract from Tab. 1 EN 10277-1

Condition Class
1 2 3 4
Permissible defect depth max 0,3 mm for d < 15 mm;
max 0,02 x d for 15 < d < 100 mm.		 max 0,3 mm for d < 15 mm;
max 0,02 x d for 15 < d < 75 mm;
max 1,5 mm for d > 75 mm.		 max 0,2 mm for d < 20 mm;
max 0,01 x d for 20 < d < 75 mm;
max 0,75 mm for d > 75 mm.		 technically crack-free by manufacture
Maximum percentage of delivered weihght in excess of specified level 4% 1% 1% 0,20%
Product form ¹        
Rounds + + + +
Squares + + (for d < 20 mm)  - -
Hexagons +  + (for d < 50 mm)  - -
Flats + ² - - -
NOTE    d = nominal diameter of bar and distance across flats of squares and hexagons
¹  + indicates available in these classes, - indicates not available in these classes
²  maximum depth of defect refers to respective section (width or thickness)

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