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Fastener nomenclature question

What are the meanings of the four digit numbers in fasteners? Ex: 4140

Ryan Anderson
employee - Shawnee, KS USA
December 20, 2009

While the context can change meaning, whenever I see "4140" in a parts specification I first consider that it refers to the steel alloy used to make the part. 4140 is a common designation for an alloy steel in North American designation systems. If that makes sense within the context of your question, it's the meaning I'd give most credence to.

Lee Gearhart
metallurgist - E. Aurora, New York
December 30, 2009

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