Scope
This European standard specifies the technical requirements for steel bars with a finished (bright) surface. The specification applies to products manufactured by cold drawing, turning, or grinding, supplied exclusively in fixed or specified lengths. The standard does not cover cold-rolled products, nor bars cut from sheet metal or strip.
Tolerances for finished bars
| Surface finish condition |
Tolerance class according to ISO 286-2 |
| |
h6 |
h7 |
h8 |
h9 |
h10 |
h11 |
h12 |
| Drawn |
|
|
|
R |
R |
R, S, H |
R, S, H |
| Turned |
|
|
|
R |
R |
R |
R |
| Polished |
R |
R |
R |
R |
R |
R |
R |
| Ground |
R |
R |
R |
R |
R |
R |
R |
| R: round bar, S: square bar, H: hexagonal bar |
Tolerance classes
| Nominal sizes, mm |
Tolerance class according to ISO 286-2 ¹ |
| h6 |
h7 |
h8 |
h9 |
h10 |
h11 |
h12 |
| >1 to ≤3 |
0.006 |
0.010 |
0.014 |
0.025 |
0.040 |
0.060 |
0.100 |
| >3 to ≤6 |
0.008 |
0.012 |
0.018 |
0.030 |
0.048 |
0.075 |
0.120 |
| >6 to ≤10 |
0.009 |
0.015 |
0.022 |
0.036 |
0.058 |
0.090 |
0.150 |
| >10 to ≤18 |
0.011 |
0.018 |
0.027 |
0.043 |
0.070 |
0.110 |
0.180 |
| >18 to ≤30 |
0.013 |
0.021 |
0.033 |
0.052 |
0.084 |
0.130 |
0.210 |
| >30 to ≤50 |
0.016 |
0.025 |
0.039 |
0.062 |
0.100 |
0.160 |
0.250 |
| >50 to ≤80 |
0.019 |
0.030 |
0.046 |
0.074 |
0.120 |
0.190 |
0.300 |
| >80 to ≤120 |
0.022 |
0.035 |
0.054 |
0.087 |
0.140 |
0.220 |
0.350 |
| >120 to ≤180 |
0.025 |
0.040 |
0.063 |
0.100 |
0.160 |
0.250 |
0.400 |
| >180 to ≤200 |
0.029 |
0.046 |
0.072 |
0.115 |
0.185 |
0.290 |
0.460 |
| ¹ The values indicated are negative deviations from the nominal size. Example for Ø20 mm (h9): 20.000 mm – 0.052 mm = 19.948 mm. |
Limit dimensions for drawn flat bars
| Width, mm |
|
|
|
|
|
| ≤18 |
+0 |
–0.11 |
h11 |
|
|
| >18 ≤30 |
+0 |
–0.13 |
h11 |
|
|
| >30 ≤50 |
+0 |
–0.16 |
h11 |
|
|
| >50 ≤80 |
+0 |
–0.19 |
h11 |
|
|
| >80 ≤100 |
+0 |
–0.22 |
h11 |
|
|
| >100 ≤150 |
+0.50 |
–0.50 |
|
|
|
| >150 ≤200 |
+1.00 |
–1.00 |
|
|
|
| >200 ≤300 |
+2.00 |
–2.00 |
|
|
|
| >300 ≤400 |
+2.50 |
–2.50 |
|
|
|
| Thickness, mm |
Limit dimension, mm ¹ ² |
| >3 ≤6 |
–0.075 |
h11 |
|
|
|
| >6 ≤10 |
–0.090 |
h11 |
|
|
|
| >10 ≤18 |
–0.11 |
h11 |
|
|
|
| >18 ≤30 |
–0.13 |
h11 |
|
|
|
| >30 ≤50 |
–0.16 |
h11 |
|
|
|
| >50 ≤60 |
–0.19 |
h11 |
|
|
|
| >60 ≤80 |
–0.30 |
h12 |
|
|
|
| >80 ≤100 |
–0.35 |
h12 |
|
|
|
- The upper limit of +0 applies to all limit dimensions.
- Limit values are valid for low-carbon steels (C ≤ 0.20%) and free-cutting steels. For other steel grades, tolerances are increased by 50%.
|
Length types and limit dimensions
| Length types |
Length, mm |
Length limit dimensions, mm |
Specified in order |
| Manufacturing length |
3000–9000¹ |
|
Length ¹ |
| Bearing length |
3000¹ or 6000¹ |
|
E.g. Bearing 6000 |
| Exact length |
≤9000 |
By agreement, min ± 5 |
Length and limit |
¹ Presence of non-standard length bars in a batch (in bundles) is allowed:
- For cross-sections ≤ 25 mm: up to 5% of bars having at least 2/3 of the nominal length.
- For cross-sections > 25 mm: up to 10% of bars having at least 2/3 of the nominal length.
Supply without short-length bars is possible upon prior agreement with EV Group China.
