Manufacturing tolerances may be specified to conform to ASTM — A 500 specification. Unless otherwise specified, all manufacturing tolerances will be suitable for standard structural applications.

Outside Dimensions (OD1, OD2)

The specified dimensions, measured across the flats on rectangles and squares, at positions at least 2″ from either end and including an allowance for convexity or concavity, shall not exceed the plus and minus tolerances shown below.

Outside Dimensional Tolerances for Rectangular and
Square Tubing
Largest Outside Dimension Across Flats in Inches Tolerance Plus or Minus

Over 4 to 5″
Over 5″


040
1%

Chemical and Mechanical Properties

Chemical and mechanical properties of tubing shall conform to the properties of the starting material specified.

Corner Radius (R)

The outside corner radius of a rectangular or square section is generally 2 x’s the material thickness (t). Maximum tolerance 3t.

Wall Thickness (t)

The wall thickness at any point shall not exceed ± 12% of the nominal wall.

Squareness of Sides (Xo)

Adjacent sides may deviate from 90o by a tolerance of ± 2o maximum.

Lengths

Cutting Tolerance


Exact Cut Cut
to size + – 0″
Min. R/L Cut to min. size + 6″ (est.) – 0″
Random Lengths 15′ -24′, standard lengths 20′

Twist (T)

Maximum Twist

Specified Dimensions of Longest side, inches
over 2″ to 4″ incl..075 6″ incl over
4″ to 8″ incl.087
over 6″ to.100 over 8″ .112

Straightness (C)

The commercial tolerance for straightness is 1/8″ times the total number of feet of total length divided by 5.

125″ x
total length
5
Outside
Dimension Tolerances
Largest Nominal Outside Dimension Across
Flats, in. (mm)
Wall Thickness inches. (mm) ±, in. (mm), across Flats, Covexity or Concavity, incl
To 1-1/4 (31.8), incl all 0.015
(0.38)
Over 1-14 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)
Maximum
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)
Twist
Tolerances
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 (63.5) 0.125 (3.5)
Squareness of Sides
±B = C x 0.006
where: B = tolerance
for out-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.
AWall tolerance is ± 10% of nominal wall thickness

TOLERANCE GUIDELINES – 200K DRAWBENCH – [AS PER ASTM A 500]


Outside Dimensions

The specified dimensions, measured across the flats on rectangles and squares, at positions at least 2″ from either end and including an allowance for convexity or concavity, shall not exceed the plus and minus tolerances shown below . . .

Outside Dimensional Tolerances for Rectangular and Square
Tubing
Tolerance Plus or Minus
Largest Outside DimensionalAcross Flats in Inches
Over 3-1/2″ to 5-1/2″ incl

Over 5-1/2″

.030″
1%

Corner Radius — The outside corner radius of rectangular or square section is generally 2 times the material thickness. Maximum tolerance 3 times.

Wall Thickness — The wall thickness of any point shall not exceed ± 12-1/2%.

Squareness of Sides

Adjacent side may deviate from 90° by a tolerance of ± 2° maximum.

Twist

Maximum Twist Specified dimensions of longest side

over 2-1/2″ to 4″ incl. over 4″ to 6″ incl.087″ over 6″ to 8″ incl .100″ over 8″ .100″

Straightness — The commercial tolerance for straightness is 1/8″ times the total number of feet of total length divided by 5.

DIAMETER,WALL,AND*
OVALITYTOLERANCES [AS PER ASTM A 554]

(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 nominal 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 tubular outside diameter tolerance spread shown is applied one half plus and one half minus to tubes having a nominal wall thickness of 3% or less of the nominal outside diameter readings should fall within the outside diameter tolerances as shown in this 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, 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 1.24 0.010 0.25
Over 1-1/2
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 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 .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 16 (127.0 to
406.4), incl.
all all 0.00125 in./in. or
mm/mm of circumference

* Wall Tolerance ± 10% of nominal wall thickness