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BWG and SWG Tube Size Chart

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BWG and SWG are alternative measurements for steel tubing sizes (outside diameter and wall thickness). BWG stands for “Birmingham Wire Gauge” (or “Stubs Iron Wire Gauge”). Each BWG number (example from 10 to 22) represents a specific steel tubing thickness, which can be converted in inches or mm. SWG stands for “Standard Wire Gauge” (also called “Imperial Wire Size”)  and is an alternative way – to BWG – to indicate steel tubing’s wall thickness. 

BWG TUBE CHART (BIRMINGHAM WIRE GAUGE)

BWG Tube gauge chart: steel tubing sizes, i.e. tubes wall thickness in inches and mm, and tubes weight in lbs/ft – kg/m (ASTM A450)

Tube Outside Diameter Tube Gauge 22 Tube Gauge 20 Tube Gauge 18 Tube Gauge 16 Tube Gauge 14 Tube Gauge 12 Tube Gauge 11 Tube Gauge 10
inch
.028		 mm
0.711		 inch
.035		 mm 0.889 inch 0.49 mm 1.244 inch 0.65 mm 1.65 inch
0.83		 mm 2.108 inch 0.109 mm 2.768 inch
0.12		 mm 3.047 inch 0.134 mm 3.403
inch mm lb/ft kg/m lb/ft kg/m lb/ft kg/m lb/ft kg/m lb/ft kg/m lb/ft kg/m lb/ft kg/m lb/ft kg/m
1/4″ 6.350 – – 0.820 0.122 0.107 0.159 0.130 0.194 – – – – – – – –
5/16″ 7.950 – – 0.106 0.157 0.14 0.209 0.175 0.260 – – – – – – – –
3/8″ 9.525 – – 0.129 0.192 0.173 0.258 0.219 0.326 0.263 0.392 – – – – – –
1/2″ 12.700 0.143 0.213 0.177 0.263 0.240 0.357 0.307 0.457 0.376 0.559 0.362 0.668 0.495 0.737 – –
5/8″ 15.875 0.181 0.270 0.224 0.334 0.306 0.456 0.395 0.558 0.489 0.727 0.61 0.908 0.658 0.979 – –
3/4′ 19.050 – – 0.271 0.404 0.373 0.555 0.483 0.719 0.601 0.894 0.759 1.13 0.82 1.22 0.894 1.33
7/8″ 22.225 0.257 0.383 0.319 0.475 0.439 0.654 0.572 0.851 0.712 1.06 0.907 1.35 0.981 1.46 1.08 1.6
1″ 25.400 0.296 0.44 0.367 0.546 0.505 0.752 0.66 0.982 0.826 1.23 1.06 1.57 1.15 1.71 1.26 1.87
1-1/4″ 31.750 0.372 0.553 0.462 0.687 0.638 0.95 0.833 1.24 1.06 1.57 1.35 2.01 1.47 2.19 1.63 2.42
1-1/2″ 38.100 0.448 0.666 0.556 0.828 0.773 1.15 1.01 1.51 1.28 1.9 1.65 2.45 1.8 2.68 1.99 2.96
1-3/4″ 44.450 0.523 0.779 0.652 0.97 0.907 1.35 1.19 1.77 1.51 2.24 1.94 2.89 2.12 3.16 2.35 3.5
2″ 50.800 0.599 0.892 0.746 1.110 1.040 1.54 1.36 2.03 1.73 2.57 2.24 3.33 2.45 3.65 2.71 4.04
2-1/2″ 63.500 – – – – 1.3 1.94 1.72 2.56 2.18 3.24 2.83 4.21 3.1 4.61 3.44 5.12
3″ 76.200 – – – – 1.57 2.34 2.7 3.08 2.63 3.91 3.42 5.09 3.75 5.58 4.17 6.2
3-1/2″ 88.900 – – – – 1.83 2.73 2.43 3.61 3.08 4.58 4.01 5.97 4.4 6.55 4.9 7.29
4″ 101.600 – – – – 2.1 3.13 2.78 4.13 3.53 5.25 4.6 6.85 5.05 7.52 5.62 8.37

SWG TUBE CHART (STANDARD WIRE GAUGE)

SWG Tube gauge chart: steel tubing sizes, i.e. tubes wall thickness in inches and mm, and tubes weight in lbs/ft – kg/m (ASTM A450)

Tube Outside Diameter Tube Gauge 22 Tube Gauge 20 Tube Gauge 18 Tube Gauge 16 Tube Gauge 14 Tube Gauge  12 Tube Gauge 11 Tube Gauge 10
inch
.028		 mm 0.711 inch
.036		 mm 0.914 inch 0.48 mm 1.218 inch 0.64 mm 1.625 inch 0.80 mm 2.032 inch 0.104 mm 2.641 inch 0.116 mm 2.946 inch 0.128 mm 3.251
inch mm lb/ft kg/m lb/ft kg/m lb/ft kg/m lb/ft kg/m lb/ft kg/m lb/ft kg/m lb/ft kg/m lb/ft kg/m
1/4″ 6.350 – – 0.830 0.124 0.105 0.157 0.129 0.192 – – – – – – –
5/16″ 7.950 – – 0.108 0.161 0.138 0.205 0.173 0.257 – – – – – – –
3/8″ 9.525 – – 0.132 0.197 0.170 0.253 0.216 0.321 0.256 0.381 – – – – –
1/2″ 12.700 0.143 0.213 0.181 0.27 0.235 0.35 0.303 0.451 0.365 0.543 0.447 0.665 0.484 0.720 – –
5/8″ 15.875 0.181 0.270 0.230 0.342 0.300 0.447 0.390 0.580 0.473 0.704 0.588 0.875 0.641 0.954 – –
3/4′ 19.050 – – 0.279 0.415 0.366 0.544 0.476 0.709 0.582 0.866 0.732 1.09 0.800 1.19 0.867 1.29
7/8″ 22.225 0.257 0.383 0.328 0.488 0.431 0.641 0.563 0.838 0.692 1.03 0.874 1.3 0.954 1.42 1.04 1.55
1″ 25.400 0.296 0.44 0.376 0.56 0.496 0.738 0.65 0.967 0.8 1.19 1.02 1.51 1.12 1.66 1.21 1.8
1-1/4″ 31.750 0.372 0.553 0.474 0.706 0.626 0.931 0.827 1.23 1.02 1.51 1.3 1.93 1.43 2.13 1.56 2.32
1-1/2″ 38.100 0.448 0.666 0.572 0.851 0.759 1.13 0.994 1.48 1.24 1.84 1.58 2.35 1.74 2.59 1.91 2.84
1-3/4″ 44.450 0.523 0.779 0.669 0.996 0.887 1.32 0.650 1.74 1.45 2.16 1.86 2.77 2.06 3.06 2.25 3.35
2″ 50.800 0.599 0.892 0.766 1.14 1.02 1.51 1.340 2.000 1.67 2.48 2.14 3.19 2.37 3.53 2.6 3.97
2-1/2″ 63.500 – – – – 1.28 1.9 1.69 2.52 2.1 3.13 2.71 4.03 3.000 4.47 3.3 4.91
3″ 76.200 – – – – 1.54 2.29 2.000 3.03 2.53 3.77 3.27 4.87 3.63 5.4 3.99 5.94
3-1/2″ 88.900 – – – – 1.79 2.67 2.390 3.55 2.97 4.42 3.83 5.7 4.26 6.34 4.68 6.97
4″ 101.600 – – – – 2.06 3.06 2.740 4.07 3.41 5.07 4.4 6.54 4.89 7.28 5.38 8.01

BWG AND SWG TUBE GAUGE CONVERSION IN MM AND INCHES

Tube SWG gauge conversion into inches and millimeters

SWG SWG Gauge in inches SWG Gauge in mm
0 Tube SWG 0.324 8.23
1 Tube SWG  0.3 7.62
2 Tube SWG 0.276 7.01
3 Tube SWG 0.252 6.4
4 Tube SWG 0.232 5.89
5 Tube SWG 0.212 5.38
6 Tube SWG 0.192 4.88
7 Tube SWG 0.176 4.47
8 Tube SWG 0.16 4.06
9 Tube SWG 0.144 3.66
10 Tube SWG 128 3.25
11 Tube SWG 0.116 2.95
12 Tube SWG 0.104 2.64
13 Tube SWG 0.092 2.34
14 Tube SWG 0.08 2.03
15 Tube SWG 0.072 1.83
16 Tube SWG 0.064 1.63
17 Tube SWG 0.056 1.42
18 Tube SWG 0.048 1.22
19 Tube SWG 0.04 1.02
20 Tube SWG 0.036 0.91
21 Tube SWG 0.032 0.81
22 Tube SWG 0.028 0.71
23 Tube SWG 0.024 0.61
24 Tube SWG 0.022 0.56
25 Tube SWG 0.02 0.51
26 Tube SWG 0.018 0.46
27 Tube SWG 0.0164 0.42
28 Tube SWG 0.0148 0.38
29 Tube SWG 0.0136 0.35
30 Tube SWG 0.0124 0.31
31 Tube SWG 0.0116 0.29
32 Tube SWG 0.0108 0.27
33 Tube SWG 0.01 0.25
34 Tube SWG 0.0092 0.23
35 Tube SWG 0.0084 0.21
36 Tube SWG 0.0076 0.19

BWG BWG Gauge to inches BWG Gauge in mm
0 Tube BWG 0.34 8.64
1 Tube BWG  0.3 7.62
2 Tube BWG 0.284 7.21
3 Tube BWG 0.259 6.58
4 Tube BWG 0.238 6.05
5 Tube BWG 0.22 5.59
6 Tube BWG 0.203 5.16
7 Tube BWG 0.18 4.57
8 Tube BWG 0.165 4.19
9 Tube BWG 0.148 3.76
10 Tube BWG 0.134 3.4
11 Tube BWG 0.12 3.05
12 Tube BWG 0.109 2.77
13 Tube BWG 0.95 2.41
14 Tube BWG 0.083 2.11
15 Tube BWG 0.072 1.83
16 Tube BWG 0.065 1.65
17 Tube BWG 0.058 1.47
18 Tube BWG 0.049 1.24
19 Tube BWG 0.042 1.07
20 Tube BWG 0.035 0.89
21 Tube BWG 0.032 0.81
22 Tube BWG 0.028 0.71
23 Tube BWG 0.025 0.64
24 Tube BWG 0.022 0.56
25 Tube BWG 0.02 0.51
26 Tube BWG 0.018 0.46
27 Tube BWG 0.016 0.41
28 Tube BWG 0.014 0.36
29 Tube BWG 0.013 0.33
30 Tube BWG 0.012 0.3
31 Tube BWG 0.01 0.25
32 Tube BWG 0.009 0.23
33 Tube BWG 0.008 0.2
34 Tube BWG 0.007 0.18
35 Tube BWG 0.005 0.13
36 Tube BWG 0.004 0.1

DIFFERENCE SWG AND SWG TUBE GAUGE

Tube Gauge Chart BWG SWG
Difference between swg and bwg tube gauge chart.pdf

8 Responses

  1. I pay a quick visit everyday a few web pages and information sites
    to read articles or reviews, however this weblog gives feature based content.

    Reply

  2. I pay a quick visit everyday a few web pages and information sites
    to read articles or reviews, however this weblog gives feature based content.

    Reply

  4. Dear Sirs/Madams, I believe the wall thickness values, in inches, are a factor of 10x too high for the tubes of gauge 18, 16, 14, and 12. No criticism here; I’ve made many mistakes in my life! Just trying to help.

    Reply

  6. Clarified my doubts and provided me the knowledge required to confidently source the material required. top job. Thank You one and all

    Reply

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