Carbon Steel conforms to ASTM A516 GR 70 or SAE 1010-1030.
FV = Full Vacuum
Note: The minor size bolt holes on reducing filler flanges are always
threaded. Also, many sizes of this style of reducing filler flange
are constructed with both the major size and minor size bolt holes
as threaded. This is to prevent interference between bolt heads and
nuts of the two-connecting flanges. Please be aware of what these
will be connected to - if connecting to other flanges that have
threaded holes, a concentric reducer (through holes on both flanges)
may be required. The PTFE-lined ductile iron reducing flanges are
constructed with the major holes as through holes in all sizes. The
thickness dimension may be different than the carbon steel reducing
flange.
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