USA Industries
Product Line Sheet

Nominal Tube Dimensions Chart (BWG)

BWG measures steel tubing sizes, indicating both outside diameter and wall thickness. BWG stands for "Birmingham Wire Gauge" or "Stubs Iron Wire Gauge." Each BWG number corresponds to a specific thickness, convertible to inches or mm.

Outside Diameter
(OD):

BWG Tube Gauge
Thickness:

Tube O.D.
Tube Gauge
BWG 00 BWG 0 BWG 1 BWG 2 BWG 3 BWG 4 BWG 5 BWG 6 BWG 7 BWG 8 BWG 9 BWG 10 BWG 11 BWG 12 BWG 13 BWG 14 BWG 15 BWG 16 BWG 17 BWG 18 BWG 19 BWG 20 BWG 21 BWG 22 BWG 23 BWG 24
Wall Thickness (in)
.380 .340 .300 .284 .259 .238 .220 .203 .180 .165 .148 .134 .120 .109 .095 .083 .072 .065 .058 .049 .042 .035 .032 .028 .025 .022
Tube I.D.
1/4"  N/A  N/A  N/A  N/A  N/A  N/A  N/A  N/A  N/A  N/A  N/A  N/A .010 .032 .060 .084 .106 .120 .134 .152 .166 .180 .186 .194 .200 .206
3/8"  N/A  N/A  N/A  N/A  N/A  N/A  N/A  N/A .015 .045 .079 .107 .135 .157 .185 .209 .231 .245 .259 .277 .291 .305 .311 .319 .325 .331
1/2"  N/A  N/A  N/A  N/A  N/A .024 .060 .094 .140 .170 .204 .232 .260 .282 .310 .334 .356 .370 .384 .402 .416 .430 .436 .444 .450 .456
5/8"  N/A  N/A .025 .057 .107 .149 .185 .219 .265 .295 .329 .357 .385 .407 .435 .459 .481 .495 .509 .527 .541 .555 .561 .569 .575 .581
3/4"  N/A .070 .150 .182 .232 .274 .310 .344 .390 .420 .454 .482 .510 .532 .560 .584 .606 .620 .634 .652 .666 .680 .686 .694 .700 .706
7/8" .115 .195 .275 .307 .357 .399 .435 .469 .515 .545 .579 .607 .635 .657 .685 .709 .731 .745 .759 .777 .791 .805 .811 .819 .825 .831
1" .240 .320 .400 .432 .482 .524 .560 .594 .640 .670 .704 .732 .760 .782 .810 .834 .856 .870 .884 .902 .916 .930 .936 .944 .950 .956
1 1/8" .365 .445 .525 .557 .607 .649 .685 .719 .765 .795 .829 .857 .885 .907 .935 .959 .981 .995 1.009 1.027 1.041 1.055 1.061 1.069 1.075 1.081
1 1/4" .490 .570 .650 .682 .732 .774 .810 .844 .890 .920 .954 .982 1.010 1.032 1.060 1.084 1.106 1.120 1.134 1.152 1.166 1.180 1.186 1.194 1.200 1.206
1 1/2" .740 .820 .900 .932 .982 1.024 1.060 1.094 1.140 1.170 1.204 1.232 1.260 1.282 1.310 1.334 1.356 1.370 1.384 1.402 1.416 1.430 1.436 1.444 1.450 1.456
1 3/4" .990 1.070 1.150 1.182 1.232 1.274 1.310 1.344 1.390 1.420 1.454 1.482 1.510 1.532 1.560 1.584 1.606 1.620 1.634 1.652 1.666 1.680 1.686 1.694 1.700 1.706
2" 1.240 1.320 1.400 1.432 1.482 1.524 1.560 1.594 1.640 1.670 1.704 1.732 1.760 1.782 1.810 1.834 1.856 1.870 1.884 1.902 1.916 1.930 1.936 1.944 1.950 1.956
2 1/4" 1.490 1.570 1.650 1.682 1.732 1.774 1.810 1.844 1.890 1.920 1.954 1.982 2.010 2.032 2.060 2.084 2.106 2.120 2.134 2.152 2.166 2.180 2.186 2.194 2.200 2.206
2 1/2" 1.740 1.820 1.900 1.932 1.982 2.024 2.060 2.094 2.140 2.170 2.204 2.232 2.260 2.282 2.310 2.334 2.356 2.370 2.384 2.402 2.416 2.430 2.436 2.444 2.450 2.456
2 3/4" 1.990 2.070 2.150 2.182 2.232 2.274 2.310 2.344 2.390 2.420 2.454 2.482 2.510 2.532 2.560 2.584 2.606 2.620 2.634 2.652 2.666 2.680 2.686 2.694 2.700 2.706
3" 2.240 2.320 2.400 2.432 2.482 2.524 2.560 2.594 2.640 2.670 2.704 2.732 2.760 2.782 2.810 2.834 2.856 2.870 2.884 2.902 2.916 2.930 2.936 2.944 2.950 2.956
3 1/4" 2.490 2.570 2.650 2.682 2.732 2.774 2.810 2.844 2.890 2.920 2.954 2.982 3.010 3.032 3.060 3.084 3.106 3.120 3.134 3.152 3.166 3.180 3.186 3.194 3.200 3.206
3 1/2" 2.740 2.820 2.900 2.932 2.982 3.024 3.060 3.094 3.140 3.170 3.204 3.232 3.260 3.282 3.310 3.334 3.356 3.370 3.384 3.402 3.416 3.430 3.436 3.444 3.450 3.456
3 3/4" 2.990 3.070 3.150 3.182 3.232 3.274 3.310 3.344 3.390 3.420 3.454 3.482 3.510 3.532 3.560 3.584 3.606 3.620 3.634 3.652 3.666 3.680 3.686 3.694 3.700 3.706
4" 3.240 3.320 3.400 3.432 3.482 3.524 3.560 3.594 3.640 3.670 3.704 3.732 3.760 3.782 3.810 3.834 3.856 3.870 3.884 3.902 3.916 3.930 3.936 3.944 3.950 3.956
4 1/4" 3.490 3.570 3.650 3.682 3.732 3.774 3.810 3.844 3.890 3.920 3.954 3.982 4.010 4.032 4.060 4.084 4.106 4.120 4.134 4.152 4.166 4.180 4.186 4.194 4.200 4.206
4 1/2" 3.740 3.820 3.900 3.932 3.982 4.024 4.060 4.094 4.140 4.170 4.204 4.232 4.260 4.282 4.310 4.334 4.356 4.370 4.384 4.402 4.416 4.430 4.436 4.444 4.450 4.456
4 3/4" 3.990 4.070 4.150 4.182 4.232 4.274 4.310 4.344 4.390 4.420 4.454 4.482 4.510 4.532 4.560 4.584 4.606 4.620 4.634 4.652 4.666 4.680 4.686 4.694 4.700 4.706
5" 4.240 4.320 4.400 4.432 4.482 4.524 4.560 4.594 4.640 4.670 4.704 4.732 4.760 4.782 4.810 4.834 4.856 4.870 4.884 4.902 4.916 4.930 4.936 4.944 4.950 4.956
5 1/4" 4.490 4.570 4.650 4.682 4.732 4.774 4.810 4.844 4.890 4.920 4.954 4.982 5.010 5.032 5.060 5.084 5.106 5.120 5.134 5.152 5.166 5.180 5.186 5.194 5.200 5.206