Reliable 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