The difference between two 304 stainless steel bolts
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Recently, we have ordered a large number of 304M16 bolts, but upon closer inspection, we found that some bolts have the words A2-70 FL marked on the nuts, while others do not. Moreover, the color of the unmarked bolts is much darker than that of the marked bolts. What is the reason? Could it be that he was deceived? Let’s talk about it. This post was last edited by Yanyangzhisteel on 2009-4-6 21:10 ]
It may be a product of two manufacturers, A2-70 is the material grade
“A2-70" is the performance mark of stainless steel bolts, screws, studs and nuts. The "A2" before "-" indicates the material group, that is, the second group of austenitic steel A2. The number part "70" after the "-" indicates the performance level of the product. The number is 1/10 of the nominal tensile strength, that is, the performance tensile strength of this product is 700N/(mm* mm). FL may be the abbreviation of material dealer