On 2010-06-21, Ed Pawlowski wrote:

I don't know if that is exactly the cost, but it sure is going to be higher.
Anything needing certification or to meet military specs is higher. In the
McMaster catalog a 1/4-20 stainless bolt can be 14¢ to meet ASTM specs and
becomes 94¢ to meet a MIL spec.

Just like food grade propane!

nb