A B8 and a B8M stud look identical, but only the B8M has the molybdenum that resists pitting. Mix-ups happen at the mill, in a warehouse and on site, and a mill certificate cannot catch a bar that was swapped after it left the mill. PMI checks the finished part itself, so the chemistry on the certificate and the part in the box are proven to match.
Handheld XRF reads the alloying elements, not carbon, and it sees chemistry, not heat treatment: B7M differs from B7 in its tempering and its hardness limit, which a hardness test tells apart.
model dataMethod as described in ASTM E1476, which lists XRF among the ways to identify metals. PMI of 100% of the bolting, with any part of the wrong grade rejected, is a supplementary requirement of ASTM A962 (examination per Guide E1916). The carbon limit of handheld XRF from an analyser maker's published guidance. Peaks sit at each element's Kα energy (physical constants); their heights are illustrative, not a measured analysis. Studs drawn as 1 in. double-end studs with 1-8 UNC threads; the analyser is generic.
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