Seamless Mechanical Steel Tube Tolerances

Hot Rolled Round Alloy Steel

Diameter Tolerances

Outside Diameter Tolerances (Inches) Outside Diameter Tolerances (Inches)
Specified Size O.D. (inches) As Rolled Or Annealed Plus & Minus Oil Quenched And Tempered Plus & Minus Specified Size O.D. (inches) As Rolled Or Annealed Plus & Minus Oil Quenched And Tempered Plus & Minus
2.000 to 2.499 .017" .027" 8.000 to 8.499 .043" .064"
2.500 to 2.999 .019" .029" 8.500 to 8.999 .045" .068"
3.000 to 3.499 .021" .032" 9.000 to 9.499 .048" .072"
3.500 to 3.999 .023" .035" 9.500 to 9999 .050" .076"
4.000 to 4.499 .025" .038" 10.000 to 10.499 .053" .080"
4.500 to 4.999 .027" .041" 10.500 to 11.000 .055" .084"
5000 to 5.499 .029î .044î 11.001 to 11.499 1% O.D. Consult
5.500 to 5.999 .031î .047î 11.500 to 11.999 1% O.D. Mill
6.000 to 6.499 .033" .050î 12.000 to 13.999 1% O.D. Consult
6.500 to 6.999 .035î .053î 14.000 to 15.999 1% O.D. Mill
7.000 to 7.499 .037î .056î 16.000 to 17.999 1% O.D. Consult
7.500 to 7.999 .040î .060î 18.000 to 24.000 1% O.D. Mill
Note 1: Normalized and tempered tolerances are the same as quenched and tempered tolerances.
Note 2: If water quench and temper is required for specified ó Refer to Mill for applicable tolerance.
Note 3: Hot Rolled tubing usually is specified OD x Wall only.

Wall Tolerances

Wall Thickness

Maximum Over & Under Normal Wall
2" to 11" O.D. Over 11" O.D.
Plus Minus Plus Minus
Walls under 10% of nominal Outside Diameter 10.0% 10.0% 12.5% 12.5%
Walls 10% of nominal O.D. to 25% of nominal O.D. inclusive. 7.5% 7.5% 12.5% 12.5%
Walls over 25% of nominal Outside Diameter 7.5% 7.5% 12.5% 12.5%
Note: Wall thickness range & tolerances are ASTM-A-519 modified

Straightness Tolerances

Outside Diameter Size Range Inches Wall % Of Outside Diameter Maximum Deviation From Straight
Total Inches
In Any
3 Feet
Total In Entire Length: Inches Per Foot Of Length
Length 3 to 22 Feet Length Under 3 And Over 22 Feet
Up to 5000" 3% OD & Over .030" .007" .010"
5.001/8.000" 4% OD & Over .045" .010" .015"
8.001/10.750" 4" OD & Over .060" .015" .020"
Note: Out-of-straightness is ordinarily checked at points of maximum deviation (as determined by line-of-sight observation) by means of a three-front straightedge and feeler gages. When overall straightness in entire length is of concern, the tube is rolled on a surface-plate and maximum deviation-from-straight is determined by means of feeler gages inserted between the tube and plate at point of maximum departure. If rotational methods such as chucking the tubs at its ends or supporting the ends on rollers and rotating under a dial indicator are used, extreme care in interpreting results must be employed because readings are influenced by OD dimensional variation in addition to deviation-from-straight. 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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