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Question:

What's the difference between 25B and 25A I-beam?

What's the difference between 25B and 25A I-beam?

Answer:

Because the channel steel is a cross section steel strip with groove shape. Its specifications, such as a*b*c (here, a, B, C, only letters, no other meaning and letters), a means waist height of a mm, leg width of B mm, waist thickness of C mm channel. For example: channel type 25a#, specifications for 250*78*7, which means waist height (a) is 250mm, leg width (b) 78mm, waist thickness (c) 7mm
Channel type 25a#, 25b#, 25c# is to indicate "waist height of the same" channel, but its leg width and waist thickness is different, so you need to add a, B, C to the right of the model to be distinguished. For example, 25a# means 250*78*7. 25b# stands for 250*80*9.25c# stands for 250*82*11.

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