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Question:

What is the difference between the type 4040c and 4040d of aluminum profile?

What is the difference between the type 4040c and 4040d of aluminum profile?

Answer:

I think you see two things and find it makes no difference to ask the question! If so, the two profiles are identical, just numbers from different companies!
Sometimes there are differences in wall thickness, and sometimes there are differences between strengthening and non strengthening.
No drawings, really difficult to say, each manufacturer of profiles on the naming method is not the same.

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