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BWG and SWG Tube Size Chart

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 DiameterTube Gauge 22Tube Gauge 20Tube Gauge 18Tube Gauge 16Tube Gauge 14Tube Gauge 12Tube Gauge 11Tube Gauge 10
inch
.028
mm
0.711
inch
.035
mm 0.889inch 0.49mm 1.244inch 0.65mm 1.65inch
0.83
mm 2.108inch 0.109mm 2.768inch
0.12
mm 3.047inch 0.134mm 3.403
inchmmlb/ftkg/mlb/ftkg/mlb/ftkg/mlb/ftkg/mlb/ftkg/mlb/ftkg/mlb/ftkg/mlb/ftkg/m
1/4″6.3500.8200.1220.1070.1590.1300.194
5/16″7.9500.1060.1570.140.2090.1750.260
3/8″9.5250.1290.1920.1730.2580.2190.3260.2630.392
1/2″12.7000.1430.2130.1770.2630.2400.3570.3070.4570.3760.5590.3620.6680.4950.737
5/8″15.8750.1810.2700.2240.3340.3060.4560.3950.5580.4890.7270.610.9080.6580.979
3/4′19.0500.2710.4040.3730.5550.4830.7190.6010.8940.7591.130.821.220.8941.33
7/8″22.2250.2570.3830.3190.4750.4390.6540.5720.8510.7121.060.9071.350.9811.461.081.6
1″25.4000.2960.440.3670.5460.5050.7520.660.9820.8261.231.061.571.151.711.261.87
1-1/4″31.7500.3720.5530.4620.6870.6380.950.8331.241.061.571.352.011.472.191.632.42
1-1/2″38.1000.4480.6660.5560.8280.7731.151.011.511.281.91.652.451.82.681.992.96
1-3/4″44.4500.5230.7790.6520.970.9071.351.191.771.512.241.942.892.123.162.353.5
2″50.8000.5990.8920.7461.1101.0401.541.362.031.732.572.243.332.453.652.714.04
2-1/2″63.5001.31.941.722.562.183.242.834.213.14.613.445.12
3″76.2001.572.342.73.082.633.913.425.093.755.584.176.2
3-1/2″88.9001.832.732.433.613.084.584.015.974.46.554.97.29
4″101.6002.13.132.784.133.535.254.66.855.057.525.628.37

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 DiameterTube Gauge 22Tube Gauge 20Tube Gauge 18Tube Gauge 16Tube Gauge 14Tube Gauge  12Tube Gauge 11Tube Gauge 10
inch
.028
mm 0.711inch
.036
mm 0.914inch 0.48mm 1.218inch 0.64mm 1.625inch 0.80mm 2.032inch 0.104mm 2.641inch 0.116mm 2.946inch 0.128mm 3.251
inchmmlb/ftkg/mlb/ftkg/mlb/ftkg/mlb/ftkg/mlb/ftkg/mlb/ftkg/mlb/ftkg/mlb/ftkg/m
1/4″6.3500.8300.1240.1050.1570.1290.192
5/16″7.9500.1080.1610.1380.2050.1730.257
3/8″9.5250.1320.1970.1700.2530.2160.3210.2560.381
1/2″12.7000.1430.2130.1810.270.2350.350.3030.4510.3650.5430.4470.6650.4840.720
5/8″15.8750.1810.2700.2300.3420.3000.4470.3900.5800.4730.7040.5880.8750.6410.954
3/4′19.0500.2790.4150.3660.5440.4760.7090.5820.8660.7321.090.8001.190.8671.29
7/8″22.2250.2570.3830.3280.4880.4310.6410.5630.8380.6921.030.8741.30.9541.421.041.55
1″25.4000.2960.440.3760.560.4960.7380.650.9670.81.191.021.511.121.661.211.8
1-1/4″31.7500.3720.5530.4740.7060.6260.9310.8271.231.021.511.31.931.432.131.562.32
1-1/2″38.1000.4480.6660.5720.8510.7591.130.9941.481.241.841.582.351.742.591.912.84
1-3/4″44.4500.5230.7790.6690.9960.8871.320.6501.741.452.161.862.772.063.062.253.35
2″50.8000.5990.8920.7661.141.021.511.3402.0001.672.482.143.192.373.532.63.97
2-1/2″63.5001.281.91.692.522.13.132.714.033.0004.473.34.91
3″76.2001.542.292.0003.032.533.773.274.873.635.43.995.94
3-1/2″88.9001.792.672.3903.552.974.423.835.74.266.344.686.97
4″101.6002.063.062.7404.073.415.074.46.544.897.285.388.01

BWG AND SWG TUBE GAUGE CONVERSION IN MM AND INCHES

Tube SWG gauge conversion into inches and millimeters

SWGSWG Gauge in inchesSWG Gauge in mm
0 Tube SWG0.3248.23
1 Tube SWG 0.37.62
2 Tube SWG0.2767.01
3 Tube SWG0.2526.4
4 Tube SWG0.2325.89
5 Tube SWG0.2125.38
6 Tube SWG0.1924.88
7 Tube SWG0.1764.47
8 Tube SWG0.164.06
9 Tube SWG0.1443.66
10 Tube SWG1283.25
11 Tube SWG0.1162.95
12 Tube SWG0.1042.64
13 Tube SWG0.0922.34
14 Tube SWG0.082.03
15 Tube SWG0.0721.83
16 Tube SWG0.0641.63
17 Tube SWG0.0561.42
18 Tube SWG0.0481.22
19 Tube SWG0.041.02
20 Tube SWG0.0360.91
21 Tube SWG0.0320.81
22 Tube SWG0.0280.71
23 Tube SWG0.0240.61
24 Tube SWG0.0220.56
25 Tube SWG0.020.51
26 Tube SWG0.0180.46
27 Tube SWG0.01640.42
28 Tube SWG0.01480.38
29 Tube SWG0.01360.35
30 Tube SWG0.01240.31
31 Tube SWG0.01160.29
32 Tube SWG0.01080.27
33 Tube SWG0.010.25
34 Tube SWG0.00920.23
35 Tube SWG0.00840.21
36 Tube SWG0.00760.19

BWGBWG Gauge to inchesBWG Gauge in mm
0 Tube BWG0.348.64
1 Tube BWG 0.37.62
2 Tube BWG0.2847.21
3 Tube BWG0.2596.58
4 Tube BWG0.2386.05
5 Tube BWG0.225.59
6 Tube BWG0.2035.16
7 Tube BWG0.184.57
8 Tube BWG0.1654.19
9 Tube BWG0.1483.76
10 Tube BWG0.1343.4
11 Tube BWG0.123.05
12 Tube BWG0.1092.77
13 Tube BWG0.952.41
14 Tube BWG0.0832.11
15 Tube BWG0.0721.83
16 Tube BWG0.0651.65
17 Tube BWG0.0581.47
18 Tube BWG0.0491.24
19 Tube BWG0.0421.07
20 Tube BWG0.0350.89
21 Tube BWG0.0320.81
22 Tube BWG0.0280.71
23 Tube BWG0.0250.64
24 Tube BWG0.0220.56
25 Tube BWG0.020.51
26 Tube BWG0.0180.46
27 Tube BWG0.0160.41
28 Tube BWG0.0140.36
29 Tube BWG0.0130.33
30 Tube BWG0.0120.3
31 Tube BWG0.010.25
32 Tube BWG0.0090.23
33 Tube BWG0.0080.2
34 Tube BWG0.0070.18
35 Tube BWG0.0050.13
36 Tube BWG0.0040.1

DIFFERENCE SWG AND SWG TUBE GAUGE

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

Comments

This post currently has 4 responses

  • 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.

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