tolerance (A554)

Diameter, Wall,A and ovality Tolerances ( All Conditions Except Tubing with Bead Removed)

Note 1- Ovality is the difference between maximum and minmum outside diameters measured at any one accross 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 overlity 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 maxiumu and minimum outside diameter readings should fall within the outside diameter tolerance as shown in this table.
Note 3- For sizes over 5-in. (127.0mm) to and including 16-in. (406.4-mm) outside diameter, when the specified wall thickness in 3 % or less of the outside diameter, the ovality shall not exceed 1.5% of the specified outside diameter.

OD Size, in. (mm)
Wall Thickness
OD ±
in.
mm
in.
mm
Under 1/2 (12.7) 0.020 to 0.049 0.51 to 1.24 0.004 0.10
1/2 to 1 (12.7 to 25.4) 0.020 to 0.065 0.51 to 1.65 0.005 0.13
1/2 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 1 1/2 (25.4 to 38.1), incl 0.025 to 0.065 0.64 to 1.65 0.008 0.20
Over 1 to 1 1/2 (25.4 to 38.1), incl over 0.065 to 0.134 over 1.65 to 3.40 0.010 0.25
Over 1 1/2 to 2 (38.1 to 50.8), incl 0.025 to 0.049 0.64 to 1.25 0.010 0.25
Over 1 1/2 to 2 (38.1 to 50.8), incl over 0.049 to 0.089 over 1.24 to 2.11 0.011 0.28
Over 1 1/2 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 2 1/2 (50.8 to 63.5), incl 0.032 to 0.065 0.81 to 1.65 0.012 0.30
Over 2 to 2 1/2 (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 2 1/2 (50.8 to 63.5), incl over 0.109 to 0.165 over 2.77 to 4.19 0.014 0.36
Over 2 1/2 to 3 1/2 (63.5 to 88.9), incl 0.032 to 0.165 0.81 to 4.19 0.014 0.36
Over 2 1/2 to 3 1/2 (63.5 to 88.9), incl over 0.165 over 4.19 0.020 0.51
Over 3 1/2 to 5 (88.9 to 127.0), incl 0.035 to 0.165 0.89 to 4.19 0.020 0.51
Over 3 1/2 to 5 (88.9 to 127.0), incl over 0.165 over 4.19 0.025 0.64
Over 5 to 7 1/2 (25.4 to 38.1), incl 0.049 to 0.250 1.24 to 6.35 0.025 0.64
Over 5 to 7 1/2 (127.0 to 190.5), incl over 0.250 over 6.35 0.030 0.76
Over 7 1/2to 16 (190.5 to 406.4), incl all all 0.00125 in./in. or mm/mm of circumference

AWall tolerance ±10% of specified wall thickness

Diameter, Wall,A 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 be 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 tolerance 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, ±
in.
mm
in.
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), excl 0.004 0.10 0.006 0.15
1 to 1 1/2 (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 2 1/2 (50.8 to 63.5), excl 0.007 0.18 0.010 0.25
2 1/2 to 3 1/2 (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

AWall tolerance is ±10% of specified wall thickness

Square and Rectangular Tubing

Outside Dimension Tolerance
Largest Specified Outside
Dimension Across Flats, in. (mm)
Wall Thickness, in. (mm)
±, in. (mm), across Flats, Convexity or Concavity, incl
To 1 1/4 (31.8), incl all 0.015 (0.38)
Over 1 1/4 to 2 1/2 (31.8 to 63.5), incl all 0.020 (0.51)
Over 2 1/2 to 5 1/2 (63.5 to 139.7), incl all 0.030 (0.76)
Over 5 1/2 to 8 (139.7 to 203.2), incl all 0.060 (1.52)

± 10 % of specified wall thickness

Maximum Radii of Corners (see fig)

radii of corners

Wall Thickness, in. (mm)
Radii of Corners, max, in. (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 1/8 (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 Tolerance

Largest Size, in. (mm)
Twist in 3 ft, max, in. (mm/m)
Under 1/2 (12.7) 0.050 (1.4)
1/2 to 1 1/2 (12.7 to 38.1), incl 0.075 (2.1)
Over 1 1/2 to 2 1/2 (38.1 to 63.5), incl 0.095 (2.6)
Over 2 1/2 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 for cut-of-square, and
C = length of longest side.
The straightness tolerance is 0.075 in. in 3 ft or 2.1 mm in 1 m using a 3-ft (1-m) straightedge and feeler gage.

 

We manufacture following grades :
301 Stainless Steel Box Section, 302 Stainless Steel Box Section, 304 Stainless Steel Box Section, 304L Stainless Steel Box Section, 305 Stainless Steel Box Section, 309S Stainless Steel Box Section, 309S-Cb Stainless Steel Box Section, 310S Stainless Steel Box Section, 316 Stainless Steel Box Section, 316L Stainless Steel Box Section, 317 Stainless Steel Box Section, 321 Stainless Steel Box Section, 330 Stainless Steel Box Section, 347 Stainless Steel Box Section, 429 Stainless Steel Box Section, 430 Stainless Steel Box Section, 430-Ti Stainless Steel Box Section.

301 Welded Square Tube, 302 Welded Square Tube, 304 Welded Square Tube, 304L Welded Square Tube, 305 Welded Square Tube, 309S Welded Square Tube, 309S-Cb Welded Square Tube, 310SWelded Square Tube, 316 Welded Square Tube, 316L Welded Square Tube, 317 Welded Square Tube, 321 Welded Square Tube, 330 Welded Square Tube, 347Welded Square Tube, 429 Welded Square Tube, 430 Welded Square Tube, 430-Ti Welded Square Tube.

301 Welded Rectangular Tube, 302 Welded Rectangular Tube, 304 Welded Rectangular Tube, 304L Welded Rectangular Tube, 305 Welded Rectangular Tube, 309S Welded Rectangular Tube, 309S-Cb Welded Rectangular Tube, 310S Welded Rectangular Tube, 316 Welded Rectangular Tube, 316L Welded Rectangular Tube, 317 Welded Rectangular Tube, 321 Welded Rectangular Tube, 330 Welded Rectangular Tube, 347 Welded Rectangular Tube, 429 Welded Rectangular Tube, 430 Welded Rectangular Tube, 430-Ti Welded Rectangular Tube.

301 Square Pipe, 302 Square Pipe, 304 Square Pipe, 304L Square Pipe, 305 Square Pipe, 309S Square Pipe, 309S-Cb Square Pipe, 310S Square Pipe, 316 Square Pipe, 316L Square Pipe, 317 Square Pipe, 321 Square Pipe, 330 Square Pipe, 347 Square Pipe, 429 Square Pipe, 430 Square Pipe, 430-Ti Square Pipe.

301 Rectangular Pipe, 302 Rectangular Pipe, 304 Rectangular Pipe, 304L Rectangular Pipe, 305 Rectangular Pipe, 309S Rectangular Pipe, 309S-Cb Rectangular Pipe, 310S Rectangular Pipe, 316 Rectangular Pipe, 316L Rectangular Pipe, 317 Rectangular Pipe, 321 Rectangular Pipe, 330 Rectangular Pipe, 347 Rectangular Pipe, 429 Rectangular Pipe, 430 Rectangular Pipe, 430-Ti Rectangular Pipe.

301 Flat Tube, 302 Flat Tube, 304 Flat Tube, 304L Flat Tube, 305 Flat Tube, 309S Flat Tube, 309S-Cb Flat Tube, 310S Flat Tube, 316 Flat Tube, 316L Flat Tube, 317 Flat Tube, 321 Flat Tube, 330 Flat Tube, 347 Flat Tube, 429 Flat Tube, 430 Flat Tube, 430-Ti Flat Tube.