EN 10277 (Defects)

Condition Class
1 2 3 4
Permissible defect depth max 0,3 mm for d < 15 mm;
max 0,02 x d from 15 to 100 mm.
max 0,3 mm for d < 15 mm;
max 0,02 x d from 15 to 75 mm;
max 1,5 mm for d > 75 mm.
max 0,2 mm for d < 20 mm;
max 0,01 x d from 20 to 75 mm;
maxv 0,75 mm for d > 75 mm.
technically crack-free by manufacture
Maximum percentage of delivered weight 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)