NOMINAL TUBE DIMENSION CHART (BWG)

BWG and SWG are alternative measurements for steel tubing sizes (OD & wall thickness). Each BWG number represents a specific steel tubing thickness, which can be converted in inches or mm. SWG (Standard Wire Gauge (SWG) is an alternate way to indicate steel tubing’s wall thickness. Calculate specific sizing by using the two drop down menus above the chart.

BWG Table

TABLE TO DETERMINE NOMINAL TUBE ID’S - BIRMINGHAM WIRE GAUGE (BWG)

Tube Gauge / Thickness:

Outside Diameter (O.D.):

TABLE TO DETERMINE NOMINAL TUBE ID’S - BIRMINGHAM WIRE GAUGE (BWG)
Wall thickness		Tube OD (in/mm)
BWG	Decimal in/mm	^3/8	^1/2	^5/8	^3/4	^7/8	1	1 ^1/8	1 ^1/4	1 ^3/8	1 ^1/2	1 ^5/8	1 ^3/4	2	2 ^1/2
BWG	Decimal in/mm	9.53	12.70	15.88	19.05	22.23	25.40	28.58	31.75	34.93	38.10	41.28	44.45	50.80	63.50