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Question: Can an A563 Grade DH high strength heavy hex nut be substituted for a lower strength A563 Grade A hex nut?

Answer: Yes. According to ASTM A563, the specification covering carbon and alloy steel nuts, the supplier may supply any higher strength nut at anytime, but the supplier must give notice to the purchaser that the substitution is being made. Read More...

A common question that we encounter has to do with what type of coupling nut should be used in conjunction with a particular grade of bolt or rod. Typically, a coupling nut would be specified as a grade of nut, as opposed to a grade of bolt. The ASTM grade of hex nut that is [...] Read More...

Question: Can an A194 grade 2H nut be substituted for an A563 grade DH nut? If so, does it work the other way around… Can an A563 grade DH nut be substituted for an A194 grade 2H nut? Answer: Both ASTM A194 Grade 2H nuts and ASTM A563 grade DH nuts are high strength nuts [...] Read More...