ASME B 18.2.6 - 2019
Heavy Hex Nuts for Use With Structural Bolts
(ASTM A563 / A194 / A194M)
|①,Chemical and mechanical properties of heavy hex nuts shall conform to ASTM A 563 grades or ASTM A194/ A194M,
Grade 2H. The nut's grade shall have a proofload capacity equal to or greater than the ultimate tensie strength of the bolt
it will be used with.