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Rebar Weight

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Dear List Members,
I have the question about the weight of Reinforcing Steel Bar.
According to ASTM A615, The weight of the rebars shall be at least 94% of the applicable weight per unit length prescribed in Table 1.
It is the  6% margine that I am curious. What caused this 6% weight margine?
If anyone knows this reason, Please let me know!!
Thanks in advance.
Kang, Sung-hoon