440 Stainless (grade unspecified) in stock
It depends entirely on which sub-grade it is, and an unspecified "440" listing does not tell you. The family spans 0.6 to 1.2% carbon and 16 to 18% chromium, and edge retention varies materially from 440A at the bottom to 440C at the top. Treat the unqualified tag as lower-confidence information.
AISI 440 is a family, not a grade. 440A, 440B and 440C are genuinely different steels with different carbon contents and different behavior. A product described only as "440 stainless" could be any of them, and the gap between the ends of the family is large enough to matter.
Corrosion resistance is excellent across the whole family, so that part of the answer is safe. Edge retention is not.
Where a manufacturer specifies the sub-grade, our product page carries it. Where the manufacturer only says 440, we say 440, because inventing a sub-grade to make a listing look better would be a fabricated specification.
Our steel reference marks this tag as lower confidence for exactly that reason, and we would rather tell you that than paper over it.
Assume the lower end of the family unless the maker states otherwise. If edge retention is your priority, buy a knife whose steel is named precisely: 440C, D2, 14C28N and the rest are all specified grades.
For a knife that mostly needs to not rust, unspecified 440 is a perfectly reasonable material.
The grid below shows 440 Stainless (grade unspecified) listings from Böker Plus, Böker Magnum, Gerber and Case, chosen from the catalog when this answer was written. Each one carries 440 Stainless (grade unspecified) in its own specification table, and its price is read from the live catalog every time the site is built.
