ID Grade MarkSpecificationPart DescriptionMaterialNom Size RangeYield (min psi)Tensile (min psi)Proof Load (psi)
No Grade MarkSAE J995 Grade 2Hot or Cold Forged NutCarbon Steel¼ and Larger  90,000
SAE J995 Grade 5Hot or Cold Forged NutsCarbon Steel¼ and Larger  120,000 (UNC)109,000 (UNF)
SAE J995 Grade 8Hot or Cold Forged NutsCarbon SteelQuenched and Tempered¼ and Larger  150,000
2HASTM A194Hot or Cold Forged Nuts for High Pressure and High Temperature ServiceMedium Carbon SteelQuenched and Tempered¼ and Larger  175,000
4ASTM A194Hot or Cold Forged Nuts for High Pressure and High Temperature ServiceMedium Carbon Alloy Steel Quenched and Tempered¼ and Larger  175,000
7ASTM A194Hot or Cold Forged Nuts for High Pressure and High Temperature ServiceMedium Carbon Alloy Steel Quenched and Tempered¼ and Larger  175,000
8ASTM A194Hot or Cold Forged Nuts for High Pressure and High Temperature ServiceAISI 304¼ and Larger  80,00075,000
8MASTM A194Hot or Cold Forged Nuts for High Pressure and High Temperature ServiceAISI 316¼ and Larger  80,00075.000
8TASTM A194Hot or Cold Forged Nuts for High Pressure and High Temperature ServiceAISI 321¼ and Larger  80,00075.000