Tolerances to BS EN 10297-2 for seamless stainless steel tubes
Introduction
Unlike the standards for flat and long products, the standards for stainless steel tube products contain information on tolerances. This is possibly because the tolerance requirements for tubes are simpler to define.
Straightness
| OD |
Deviation from straightness on tube length L |
| > 33.7 mm |
0.0020 L |
| < 33.7 mm |
Agreed at time of enquiry and order |
Outside Diameter (D) and Wall Thickness (T)
Ovality is included in tolerances for outside diameter. Eccentricity is covered in tolerances for wall thickness.Unless otherwise agreed at the time of the enquiry and order the following tolerances shall apply:
| Process Route |
Tolerance on D |
Tolerance on T |
| Tolerance Class |
Tolerance Limits |
Tolerance Class |
Tolerance Limits |
| Hot finished |
D1 |
± 1.5% or ± 0.75 mm whichever is the greater |
T1 |
± 15% or ± 0.6 mm whichever is the greater |
| Cold finished |
D3 |
± 0.75% or ± 0.3 mm whichever is the greater |
T3 |
± 10% or ± 0.2 mm whichever is the greater |
If agreed at time of enquiry and order the following tolerances can apply. The purchaser can specify whether the tighter tolerance is required on D or T or both:
| Process Route |
Tolerance on D |
Tolerance on T |
| Tolerance Class |
Tolerance Limits |
Tolerance Class |
Tolerance Limits |
| Hot finished |
D2 |
± 1% or ± 0.5 mm whichever is the greater |
T2 |
± 12.5% or ± 0.4 mm whichever is the greater |
| Cold finished |
D4 |
± 0.5% or ± 0.1 mm whichever is the greater |
T4 |
± 7.5% or ± 0.15 mm whichever is the greater |
Length
The tubes shall be supplied in random lengths unless otherwise agreed at the time of the enquiry and order. The purchaser shall specify the range of random lengths to be supplied. If exact lengths are required the tolerances given below shall apply:
| Length L (mm) |
Tolerance (mm) |
| L < 6000 |
+5/-0 |
| 6000 < L < 12000 |
+10/-0 |
| L > 12000 |
by agreement |
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