CSA G40.21 50W or Metric 350W Class H Fact Sheet
In accordance with CSA G40.21, hollow sections — welded or seamless round, square, rectangular or special-profile structural tubing — are available in two classes: Class C and Class H. The benefits of Class H over Class C include increased axial capacity in accordance with CSA S16-14 and savings in mass up to 20%. CSA G40.21 50W Class H HSS are regularly rolled at our factory in Harrow, Ontario.