Cross section tolerances (acc. to EN 10278)

Nominal size Accuracy class
h6 h7 h8 h9 h10 h11
mm
from 4 to 6 -0,008 -0,012 -0,018 0,030 -0,048 -0,075
over 6 to 10 -0,009 -0,015 -0,022 -0,036 -0,058 -0,090
over 10 to 18 -0,011 -0,018 -0,027 -0,043 -0,070 -0,110
over 18 to 30 -0,013 -0,021 -0,033 -0,052 -0,084 -0,130
over 30 to 50 -0,016 -0,025 -0,039 -0,062 -0,100 -0,160
over 50 to 80 -0,019 -0,030 -0,046 -0,074 -0,120 -0,190

Surface quality classes (acc. to EN 10277)

Class 1)
1 2 3 4
Permissible defect depth max 0,3mm for d ≤ 15mm; max 0,02 x d for 15 < d ≤ 100mm max 0,3mm for d ≤15mm; max 0,02 x d for 15 < d ≤ 75mm; max 1,5mm dla d > 75mm max 0,2mm for d ≤ 20mm; max 0,01 x d for 20 < d ≤ 75mm; max 0,75mm dla d > 75mm without cracks arising during manufacture process
Max amount of delivered products with higher than determined defect 4% 1% 1% 0,2%
Product 2)
Round bars + + + +
Square bars + +
(for d ≤ 20mm)3)
+ +
Hexagonal bars + +
(for d ≤ 50mm)3)
+ +

d = nominal diameter of a bar (round bars) or its distance across the flats (square and hexagonal bars).

1)If there were no pre-ordering agreements in the offer inquiry, Class 1 default surface is delivered.

2)+ denotes available in this class, – denotes unavailable in this class.

3)Crack detection using the rotary current method is not possible for d>20 mm or d>50 mm

Straightness deviations (acc. to EN 10278)*

* higher straightness requires agreement

Product Steel group Nominal dimension
[mm]
Max deviation [mm]
Round bars < 0,25 % C 1,0
≥ 0,25% C, alloy, quenched and tempered steels 1,5
Stainless, tool and bearing steels 1,0
Square and hexagonal bars < 0,25 % C ≤ 75 1,0
≥ 0,25% C, alloy steel, quenched and tempered steels ≤ 75 2,0
Stainless, tool and bearing steels ≤ 75 1,0

see also