TOLERANCES ASTM A554 FOR WELDED ROUND SQUARE AND RECTANGULAR TUBING
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Diameter, Wall,* and Ovality Tolerances (all conditions except tubing with bead removed)

Note 1 – Ovality is the difference between maximum and minimum outside diameters measured at any one cross section. There is no additional tolerance for ovality on tubes having a specified wall
thickness of more than 3% of the outside diameter.

Note 2 – For sizes up to and including 5 in, (127.0 mm) outside diameter, an ovality tolerance of twice the tabular outside diameter tolerance spread shown is applied one half plus and one half minus to tubes having a specified wall thickness of 3% or less of the specified outside diameter. The average of the maximum and minimum outside diameter readings should fall within the outside diameter tolerances as shown in the table.

Note 3 – For sizes over 5 in. (127.0 mm) to and including 16 in. (406.4 mm) outside diameter, when the specified wall thickness is 3% or less of the outside diameter, the ovality shall not exceed 1.5% of the specified outside diameter.

OD Size
inches (mm)

Wall Thickness OD ± 
inches mm inches mm
Under ½ (12.7) 0.020 to 0.049 0.51 to 1.24 0.004 0.10
½ to 1 (12.7 to 25.4) 0.020 to 0.065 0.51 to 1.65 0.005 0.13
½ to 1 (12.7 to 25.4) over 0.065 to 0.134 over 1.65 to 3.40 0.010 0.25
over 1 to 1½ (25.4 to 38.1) incl 0.025 to 0.065 0.64 to 1.65 0.008 0.20
over 1 to 1½ (25.4 to 38.1) incl over 0.065 to 0.134 over 1.65 to 3.40 0.010 0.25
over 1½ to 2 (38.1 to 50.8) incl 0.025 to 0.049 0.64 to 1.24 0.010 0.25
over 1½ to 2 (38.1 to 50.8) incl over 0.049 to 0.083 over 1.24 to 2.11 0.011 0.28
over 1½ to 2 (38.1 to 50.8) incl over 0.083 to 0.149 over 2.11 to 3.78 0.012 0.30
over 2 to 2½ (50.8 to 63.5) incl 0.032 to 0.065 0.81 to 1.65 0.012 0.30
over 2 to 2½ (50.8 to 63.5) incl over 0.065 to 0.109 over 1.65 to 2.77 0.013 0.33
over 2 to 2½ (50.8 to 63.5) incl over 0.109 to 0.165 over 2.77 to 4.19 0.014 0.36
over 2½ to 3½ (63.5 to 88.9) incl 0.032 to 0.165 0.81 to 4.19 0.014 0.36
over 2½ to 3½ (63.5 to 88.9) incl over 0.165 over 4.19 0.020 0.51
over 3½ to 5 (88.9 to 127.0) incl 0.035 to 0.165 0.89 to 4.19 0.020 0.51
over 3½ to 5 (88.9 to 127.0) incl over 0.165 over 4.19 0.025 0.64
over 5 to 7½ (127.0 to 190.5) incl 0.049 to 0.250 1.24 to 6.35 0.025 0.64
over 5 to 7½ (127.0 to 190.5) incl over 0.250 over 6.35 0.030 0.76
over 7½ to 16 (190.5 to 406.4) incl all all 0.00125 in./in. or mm/mm of circumstances

Diameter, Wall,* and Ovality Tolerances (for tubing with bead removed)

Note 1 – Ovality is the difference between maximum and minimum outside diameters measured at any one cross section. There is no additional tolerance for ovality on tubes having a specified wall thickness of more than 3% of the outside diameter.

Note 2 – An ovality allowance of twice the outside diameter tolerance, shown in this table, is applied one half plus and one half minus to the outside diameter, for tubes having a specified wall thickness of 3% or less of the specified outside diameter. The average of the maximum and minimum outside diameter readings should fall within the outside diameter tolerances of this table.

Note 3 – Tubing may be specified to only two of the three following dimensions – outside diameter, inside diameter, or wall.

OD Size in. (mm)
OD ± ID ±
inches mm inches mm
Up to 3⁄32 (2.4) excl 0.001 0.03 0.001 0.03
3⁄32 to 3⁄16 (2.4 to 4.8) excl 0.0015 0.038 0.0015 0.038
3⁄16 to 1⁄2 (4.8 to 12.7) excl 0.003 0.08 0.005 0.13
1⁄2 to 1 (12.7 to 25.4) 0.004 0.10 0.006 0.15
1 to 11⁄2 (25.4 to 38.1) excl 0.005 0.13 0.007 0.18
1 1⁄2 to 2 (38.1 to 50.8) excl 0.006 0.15 0.008 0.20
2 to 21⁄2 (50.8 to 63.5) excl 0.007 0.18 0.010 0.25
2 1⁄2 to 31⁄2 (63.5 to 88.9) excl 0.010 0.25 0.014 0.36
3 1⁄2 to 5 (88.9 to 127.0) incl 0.015 0.38 0.020 0.51
over 5 to 16 (127.0 to 406.4) incl 0.00125 in./in. or mm/mm of circumference
0.0013 in./in. or mm/mm of circumference

 

Square and Rectangular Tubing

Diameter, Wall,* and Ovality Tolerances (all conditions except tubing with bead removed)

Note 1 – Ovality is the difference between maximum and minimum outside diameters measured at any one cross section. There is no additional tolerance for ovality on tubes having a specified wall
thickness of more than 3% of the outside diameter.

Note 2 – For sizes up to and including 5 in, (127.0 mm) outside diameter, an ovality tolerance of twice the tabular outside diameter tolerance spread shown is applied one half plus and one half minus to tubes having a specified wall thickness of 3% or less of the specified outside diameter. The average of the maximum and minimum outside diameter readings should fall within the outside diameter tolerances as shown in the table.

Note 3 – For sizes over 5 in. (127.0 mm) to and including 16 in. (406.4 mm) outside diameter, when the specified wall thickness is 3% or less of the outside diameter, the ovality shall not exceed 1.5% of the specified outside diameter.

OD Size
inches (mm)

Wall Thickness OD ± 
inches mm inches mm
Under ½ (12.7) 0.020 to 0.049 0.51 to 1.24 0.004 0.10
½ to 1 (12.7 to 25.4) 0.020 to 0.065 0.51 to 1.65 0.005 0.13
½ to 1 (12.7 to 25.4) over 0.065 to 0.134 over 1.65 to 3.40 0.010 0.25
over 1 to 1½ (25.4 to 38.1) incl 0.025 to 0.065 0.64 to 1.65 0.008 0.20
over 1 to 1½ (25.4 to 38.1) incl over 0.065 to 0.134 over 1.65 to 3.40 0.010 0.25
over 1½ to 2 (38.1 to 50.8) incl 0.025 to 0.049 0.64 to 1.24 0.010 0.25
over 1½ to 2 (38.1 to 50.8) incl over 0.049 to 0.083 over 1.24 to 2.11 0.011 0.28
over 1½ to 2 (38.1 to 50.8) incl over 0.083 to 0.149 over 2.11 to 3.78 0.012 0.30
over 2 to 2½ (50.8 to 63.5) incl 0.032 to 0.065 0.81 to 1.65 0.012 0.30
over 2 to 2½ (50.8 to 63.5) incl over 0.065 to 0.109 over 1.65 to 2.77 0.013 0.33
over 2 to 2½ (50.8 to 63.5) incl over 0.109 to 0.165 over 2.77 to 4.19 0.014 0.36
over 2½ to 3½ (63.5 to 88.9) incl 0.032 to 0.165 0.81 to 4.19 0.014 0.36
over 2½ to 3½ (63.5 to 88.9) incl over 0.165 over 4.19 0.020 0.51
over 3½ to 5 (88.9 to 127.0) incl 0.035 to 0.165 0.89 to 4.19 0.020 0.51
over 3½ to 5 (88.9 to 127.0) incl over 0.165 over 4.19 0.025 0.64
over 5 to 7½ (127.0 to 190.5) incl 0.049 to 0.250 1.24 to 6.35 0.025 0.64
over 5 to 7½ (127.0 to 190.5) incl over 0.250 over 6.35 0.030 0.76
over 7½ to 16 (190.5 to 406.4) incl all all 0.00125 in./in. or mm/mm of circumstances

Diameter, Wall,* and Ovality Tolerances (for tubing with bead removed)

Note 1 – Ovality is the difference between maximum and minimum outside diameters measured at any one cross section. There is no additional tolerance for ovality on tubes having a specified wall thickness of more than 3% of the outside diameter.

Note 2 – An ovality allowance of twice the outside diameter tolerance, shown in this table, is applied one half plus and one half minus to the outside diameter, for tubes having a specified wall thickness of 3% or less of the specified outside diameter. The average of the maximum and minimum outside diameter readings should fall within the outside diameter tolerances of this table.

Note 3 – Tubing may be specified to only two of the three following dimensions – outside diameter, inside diameter, or wall.

Outside Dimension Tolerances
Largest specified outside dimension
across flats, inches (mm)
Wall
thickness,
inches (mm)
± Inches (mm)
across flats,
convesity or
concavity, included
to 1¼ (31.8) incl all 0.015 (0,38)
over 1¼ to 2½ (31.8 to 63.5) incl all 0.020 (0.51)
over 2½ to 5½ (63.5 to 139.7 (incl) all 0.030 (0.76)
over 5½ to 8 (139.7 to 203.2) incl all 0.060 (1.52)
1 to 11⁄2 (25.4 to 38.1) excl 0.005 0.13
>Wall Thickness Tolerance
______________________________
± 10% of specified wall thickness
Maximum Radii of Corners
Wall Thickness, inches (mm) Radii of Corners,
max, inches (mm)
over 0.020 to 0.049 (0.51 to 1.24) incl
3⁄32 (2.4)
over 0.049 to 0. 065 (1.24 to 1.65) incl
⅛ (3.2)
over 0.065 to 0.083 (1.65 to 2.11) incl
9⁄64 (3.6)
over 0.083 to 0.095 (2.11 to 2.42) incl
3⁄16 (4.8)
over 0.095 to 0.109 (2.42 to 2.77) incl
13⁄64 (5.2)
over 0.109 to 0.134 (2.77 to 3.40) incl
7⁄32 (5.6)
over 0.134 to 0.156 (3.40 to 3.96) incl
1⁄4 (6.4)
over 0.156 to 0.200 (3.96 to 5.08) incl
3⁄8 (9.5)
over 0.200 to 0.250 (5.08 to 6.35) incl 1⁄2 (12.7)
over 0.250 to 0.375 (6.35 to 9.53) incl
3⁄4 (19.1)
Twist Tolerances
Largest Size, inches (mm) Twist in 3 ft,
max, inches (mm/m)
Under ½ (12.7)
0.050 (1.4)
½ to 1½ (12.7 to 38.1) incl
0.075 (2.1)
over 1½ to 2½ (38.1 to 63.5) incl
0.095 (2.6)
over 2½ to 4 (63.5 to 101.6) incl
0.125 (3.5)
over 4 to 6 (101.6 to 152.4) incl
0.250 (6.9)
over 6 (152.4)
0.375 (10.4)
Squareness of Sides
± B + C x 0.006
where
B = tolerance of out-of-square, and
C = length of longest side
The straightness tolerance is 0.075 in. in 3ft or 2.1 mm in 1 m
using a 3 ft (I m)straight edge and feeler gauge.