Imagine you are a stamping plant. You buy 100 tons of steel, and your tooling is designed to the 2017 flatness spec. However, your supplier has a dusty copy of the 1998 version. The 1998 standard is looser by 0.020". You certify the steel as "good," run it through the press, and break a $50,000 die. The lawsuit will hinge on which standard was cited in the purchase order. If you said "per AISI D100," you lose. If you said "per ," the supplier is liable.
: Guidance on bolted, screwed, and welded connection design. Aisi D100-17 Pdf