Seamless Mechanical Steel Tube Tolerances

Cold Drawn Round Alloy Steel

Diameter Tolerances

OD
Size Range,
Inches
Wall:
Percent of
OD
Unannealed Or
Stress Relief Annealed
Soft Annealed or
Normalized
Oil Quenched
& Tempered
OD Inches ID Inches OD Inches ID Inches OD & ID
Plus Minus Plus Minus Plus Minus Plus Minus Plus/Minus
Up to 0.499 All .004 .000 .005 .002 .005
0.500-1.699 All .005 .000 .000 .005 .007 .002 .002 .007 .007
1.700-2.099 All .006 .000 .000 .006 .006 .005 .005 .006 .008
2.100-2.499 All .007 .000 .000 .007 .008 .005 .005 .008 .009
2.500-2.899 All .008 .000 .000 .008 .009 .005 .005 .009 .010
2.900-3.299 All .009 .000 .000 .009 .011 .005 .005 .011 .012
3.300-3.699 All .010 .000 .000 .010 .013 .005 .005 .013 .013
3.700-4.099 All .011 .000 .000 .011 .013 .007 .010 .010 .014
4.100-4.499 All .012 .000 .000 .012 .014 .007 .011 .011 .015
4.500-4.899 All .013 .000 .000 .013 .016 .007 .012 .012 .017
4.900-5.299 All .014 .000 .000 .014 .018 .007 .013 .013 .018
5.300-5.549 All .015 .000 .000 .015 .020 .007 .014 .014 .019
5.550-5.999 Under 6 .010 .010 .010 .010 .018 .018 .018 .018 .025
6 to 71/2 .009 .009 .009 .009 .016 .016 .016 .016 .023
Over 71/2 .018 .000 .009 .009 .017 .015 .016 .016 .023
6.000-6.499 Under 6 .013 .013 .013 .013 .023 .023 .023 .023 .033
6 to 71/2 .010 .010 .010 .010 .018 .018 .018 .018 .025
Over 71/2 .020 .000 .010 .010 .020 .015 .018 .018 .025
6.500-6.999 Under 6 .015 .015 .015 .015 .027 .027 .027 .027 .038
6 to 71/2 .012 .012 .012 .012 .021 .021 .021 .021 .029
Over 71/2 .012 .012 .012 .012 .021 .021 .021 .021 .029
7.000-7.499 Under 6 .018 .018 .018 .018 .032 .032 .032 .032 .045
6 to 71/2 .013 .013 .013 .013 .023 .023 .023 .023 .033
Over 71/2 .026 .000 .013 .013 .031 .015 .023 .023 .033
7.500-7.999 Under 6 .020 .020 .020 .020 .035 .035 .035 .035 .050
6 to 71/2 .015 .015 .015 .015 .026 .026 .026 .026 .037
Over 71/2 .029 .000 .015 .015 .036 .015 .026 .026 .037
8.000-8.499 Under 6 .023 .023 .023 .023 .041 .041 .041 .041 .058
6 to 71/2 .016 .016 .016 .016 .028 .028 .028 .028 .040
Over 71/2 .031 .000 .015 .016 .033 .022 .028 .028 .040
8.500-8.999 Under 6 .025 .025 .025 .025 .044 .044 .044 .044 .063
6 to 71/2 .017 .017 .017 .017 .030 .030 .030 .030 .043
Over 71/2 .034 .000 .015 .019 .038 .022 .030 .030 .043
9.000-9.499 Under 6 .028 .028 .028 .028 .045 .045 .049 .049 .070
6 to 71/2 .019 .019 .019 .019 .033 .033 .033 .033 .047
Over 71/2 .037 .000 .015 .022 .043 .022 .033 .033 .047
9.500-9.999 Under 6 .030 .030 .030 .030 .045 .045 .053 .053 .075
6 to 71/2 .020 .020 .020 .020 .035 .035 .035 .035 .050
Over 71/2 .040 .000 .015 .025 .048 .022 .035 .035 .050
10.000-10.999 Under 6 .034 .034 .034 .034 .045 .045 .060 .060 .080
6 to 71/2 .022 .022 .022 .022 .039 .039 .039 .039 .055
Over 71/2 .044 .000 .015 .029 .055 .022 .039 .039 .055
11.000-12.000 Under 6 .035 .035 .035 .035 .050 .050 .065 .065
6 to 71/2 .025 .025 .025 .025 .045 .045 .045 .045
Over 71/2 .045 .000 .015 .035 .060 .022 .045 .045
Tabulated tolerances can be applied simultaneously to only two of three dimensions, i.e., ODxWall or IDxWall. ID Tolerances apply only to tube specified ODxID or IDxWall...and to dimensions 0.625" and over when ID is at least half the OD. Wall thickness less than 3% of OD, require added ovality tolerances of plus and minus 1/2% of mean OD. If water quench and temper is required or specified-refer to Mill for applicable tolerance.

Wall Tolerances

Wall
Thickness
% of OD
Wall Tolerances Max%
Over And Under Normal Wall
ID Under .500" ID .500" Over
Under 10% ±10.0% ±7.5%
10 to 25% ±10.0% ±6.0%
Over 25% ±12.5% ±7.5%
ASTM-A-519 modified

Straightness Tolerances

Outside
Diameter
Size Range
Inches
Wall
Percent
Of Outside
Diameter
Total
Camber
In Any
3 Feet
Up to 5.000" 3% OD & Over .030"
5.001/8.000" 4% OD & Over .045"
8.001/10.750" 4% OD & Over .060"
Not applicable to quenched and tempered tubes over 302 BHN

The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other purposes.

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