Channel 20A? What's the matter?
Channel steel, 20#A specification, 200*73*7.0 theory, weight 22.637
Not 20A. It should be 20A. The letters in the back of the numbers are different in meaning. The letters behind the channel must be lowercase (waist thickness is different).20 represents section height 200mm of channel steel, 200*73*7.0 theoretical weight 22.637
