ELECTRIC RESISTANCE WELDED TUBING

ASTM A513

Electric resistance welded tubes are produced from a cold rolled or hot rolled strip which is formed by rolls at room temperature into a tubular shape. Welding takes place as an electric current heats the two edges of the strip as they are pressed together. Only a narrow band of metal is heated while the rest of the tube remains at room temperature. The weld flash is always trimmed off the outside of the tube. The flash can also be trimmed or rolled down on the inside by special tooling.

DIAMETER TOLERANCES (INCHES) COLD ROLLED ROUND

NOTE: Measurements for diameter are to be taken at least 2 inchesa from the ends of the tubes.

Outside Diameter
Range, In.a
Wall Thickness
Flash-in
Tubingb
Flash
Controlled
to 0.010 In.
max
Tubingc
Flash Controlledd
to 0.005 In. max
Tubing
Bwge
In.a
Outside
Diameter
Plus and
Minus
Outside
Diameter
Plus and
Minus
Outside
Diameter
Plus and
Minus
Inside
Diameter
Plus and
Minus
Tolerances, In.f
3/8 to 5/8, incl
22 to 16
0.028 to 0.065
0.0030
Over 5/8 to 1-1/8,
incl
22 to 20
0.028 to 0.035
0.0035
0.0035
0.0035
0.013
Over 5/8 to 1-1/8,
incl
18
0.049
0.0035
0.0035
0.0035
0.015
Over 5/8 to 1-1/8,
incl
16 to 14
0.065 to 0.083
0.0035
0.0035
0.0035
0.019
Over 3/4 to 1-1/8,
incl
13
0.095
0.0035
0.0035
0.0035
0.019
Over 7/8 to 1-1/8,
incl
12 to 11
0.109 to 0.120
0.0035
0.0035
0.0035
0.021
Over 1-1/8 to 2,
incl
22 to 18
0.028 to 0.049
0.005
0.005
0.005
0.015
Over 1-1/8 to 2,
incl
16 to 13
0.065 to 0.095
0.005
0.005
0.005
0.019
Over 1-1/8 to 2,
incl
12 to 10
0.109 to 0.134
0.005
0.005
0.005
0.022
a1 inch = 25.4 mm.
bFlash-In tubing is produced to outside diameter tolerances and wall thickness tolerances only, and the height of the inside welding flash does not exceed the wall thickness or 3/32 inch, whichever is less.
cFlash controlled to 0.010 inch max tubing consists of tubing over 5/8 inch outside diameter which is commonly produced to outside diameter tolerances and wall thickness tolerances only, in which the height of the remaining inside welding flash is controlled not to exceed 0.010 inch
dFlash controlled to 0.005 inch max tubing is produced to outside diameter tolerances and wall thickness tolerances, inside diameter tolerances and wall thickness tolerances, or outside diameter tolerances and inside diameter tolerances, in which the height of the remaining inside welding flash is controlled not to exceed 0.005 inch. Any remaining flash is considered to be part of the applicable inside diameter tolerances.
eBirmingham Wire Gauge.
fThe ovality shall be within the above tolerances except when the wall thickness is less than 3 percent of the outside diameter.

 

Outside Diameter
Range, In.a
Wall Thickness
Flash-in
Tubingb
Flash
Controlled
to 0.010 In.
max
Tubingc
Flash Controlledd
to 0.005 In. max
Tubing
Bwge
In.a
Outside
Diameter
Plus and
Minus
Outside
Diameter
Plus and
Minus
Outside
Diameter
Plus and
Minus
Inside
Diameter
Plus and
Minus
Tolerances, In.f
Over 2 to 2-1/2, incl
20 to 18
0.035 to 0.049
0.006
0.006
0.006
0.016
Over 2 to 2-1/2, incl
16 to 13
0.065 to 0.095
0.006
0.006
0.006
0.020
Over 2 to 2-1/2, incl
12 to 10
0.109 to 0.134
0.006
0.006
0.006
0.023
Over 2-1/2 to 3, incl
20 to 18
0.035 to 0.049
0.008
0.008
0.008
0.018
Over 2-1/2 to 3, incl
16 to 13
0.065 to 0.095
0.008
0.008
0.008
0.022
Over 2-1/2 to 3, incl
12 to 10
0.109 to 0.134
0.008
0.008
0.008
0.025
Over 3 to 3-1/2, incl
20 to 18
0.035 to 0.049
0.009
0.009
0.009
0.019
Over 3 to 3-1/2, incl
16 to 13
0.065 to 0.095
0.009
0.009
0.009
0.023
Over 3 to 3-1/2, incl
12 to 10
0.109 to 0.134
0.009
0.009
0.009
0.026
Over 3-1/2 to 4, incl
20 to 18
0.035 to 0.049
0.010
0.010
0.010
0.020
Over 3-1/2 to 4, incl
16 to 13
0.065 to 0.095
0.010
0.010
0.010
0.024
Over 3-1/2 to 4, incl
12 to 10
0.109 to 0.134
0.010
0.010
0.010
0.027
Over 4 to 6, incl
16 to 13
0.065 to 0.095
0.020
0.020
0.020
0.034
Over 4 to 6, incl
12 to 10
0.109 to 0.134
0.020
0.020
0.020
0.037
Over 6 to 8, incl
14 to 13
0.083 to 0.095
0.025
0.025
0.025
0.039
Over 6 to 8, incl
12 to 10
0.109 to 0.134
0.025
0.025
0.025
0.042
a1 inch = 25.4 mm.
bFlash-In tubing is produced to outside diameter tolerances and wall thickness tolerances only, and the height of the inside welding flash does not exceed the wall thickness or 3/32 inch, whichever is less.
cFlash controlled to 0.010 inch max tubing consists of tubing over 5/8 inch outside diameter which is commonly produced to outside diameter tolerances and wall thickness tolerances only, in which the height of the remaining inside welding flash is controlled not to exceed 0.010 inch
dFlash controlled to 0.005 inch max tubing is produced to outside diameter tolerances and wall thickness tolerances, inside diameter tolerances and wall thickness tolerances, or outside diameter tolerances and inside diameter tolerances, in which the height of the remaining inside welding flash is controlled not to exceed 0.005 inch. Any remaining flash is considered to be part of the applicable inside diameter tolerances.
eBirmingham Wire Gauge.
fThe ovality shall be within the above tolerances except when the wall thickness is less than 3 percent of the outside diameter.

WALL THICKNESS TOLERANCES (INCHES) COLD ROLLED ROUND

Wall
Thickness
Outside Diameter, In.
In.a
Bwgb
3/8 to
7/8
incl.
Over 7/8
to 1-7/8,
inc.
Over 1-7/8
to 3-3/4,
inc.
Over 3-3/4
to 5,
incl.
Over 5
to 6,
incl.
Over 6
to 8,
incl.
Wall Thickness Tolerances, in.,a Plus and Minus
Plus
Minus
Plus
Minus
Plus
Minus
Plus
Minus
Plus
Minus
Plus
Minus
0.028
22
0.001
0.005
0.001
0.005
0.035
20
0.002
0.005
0.001
0.005
0.001
0.005
0.049
18
0.003
0.006
0.002
0.006
0.002
0.006
0.065
16
0.005
0.007
0.004
0.007
0.004
0.007
0.004
0.007
0.004
0.007
0.083
14
0.006
0.007
0.005
0.007
0.004
0.007
0.004
0.007
0.004
0.008
0.004
0.008
0.095
13
0.006
0.007
0.005
0.007
0.004
0.007
0.004
0.007
0.004
0.008
0.004
0.008
0.109
12
0.006
0.008
0.005
0.008
0.005
0.008
0.005
0.009
0.005
0.009
0.120
11
0.007
0.008
0.006
0.008
0.005
0.008
0.005
0.009
0.005
0.009
0.134
10
0.007
0.008
0.006
0.008
0.005
0.008
0.005
0.009
0.005
0.009

a 1 inch = 25.4 mm.
b Birmingham Wire Gauge.