STANDARD BOLT IDENTIFICATION MARKINGS

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Proof Load(psi)Yield StrengthMin (psi)Tensile StrengthMin (psi)Low or Medium Carbon Steel1/4 THRU 1 33,00036,000Low CarbonSteel1 4 thru 4 SAE J429Grade 2Low or Medium Carbon Steel1 4 thru 3 4Over 3 4 thru 1 55,00033,00057,00036,00074,00060,000 No Grade MarkSAE J429Grade 4StudsMedium Carbon Cold Drawn Steel1 4 thru 1 100,000115,000Low or Medium Carbon Steel1/4 THRU 1 33,00036,000Low CarbonSteel1 4 thru 4 Low or Medium Carbon Steel1 4 thru 3 4Over 3 4 thru 1 55,00033,00057,00036,00074,00060,000ASTM A193Grade B5Bolts, Screws, Studs forHigh Temperature ServiceAISI 5011 4 thru 4 80,000100,000ASTM A193Grade B6Bolts, Screws, Studs forHigh Temperature ServiceAISI 4101 4 thru 4 85,000110,000ASTM A193Grade B7Bolts, Screws, Studs forHigh Temperature ServiceAISI 4140,4142, or41451 4 thru 2 Over 2 thru 4Over 4 thru 7 105,00095,00075,000125,000115,000100,000 ASTM A193Grade B16Bolts, Screws.

Proof Load (psi) Yield Strength Min (psi) Tensile Strength Min (psi) STANDARD BOLT IDENTIFICATION MARKINGS Identification Low‐ or Medium‐ Carbon Steel,