STANDARD BOLT IDENTIFICATION MARKINGS

Proof Load(psi)Yield StrengthMin (psi)Tensile StrengthMin (psi)Low or Medium Carbon Steel1/4 THRU 1 33,00036,000 Low CarbonSteel1 4 thru 4 SAE J429 grade 2 Low or Medium Carbon Steel1 4 thru 3 4 Over 3 4 thru 1 55,00033,00057,00036,00074,00060,000 No grade MarkSAE J429 grade 4 StudsMedium Carbon Cold Drawn Steel1 4 thru 1 100,000115,000 Low or Medium Carbon Steel1/4 THRU 1 33,00036,000 Low CarbonSteel1 4 thru 4 Low or Medium Carbon Steel1 4 thru 3 4 Over 3 4 thru 1 55,00033,00057,00036,00074,00060,000 ASTM A193 grade B5 Bolts, Screws, Studs forHigh Temperature ServiceAISI 5011 4 thru 4 80,000100,000 ASTM A193 grade B6 Bolts, Screws, Studs forHigh Temperature ServiceAISI 4101 4 thru 4 85,000110,000 ASTM A193 grade B7 Bolts, Screws, Studs forHigh Temperature ServiceAISI 4140,4142, or41451 4 thru 2 Over 2 thru 4 Over 4 thru 7 105,00095,00075,000125,000115,000100,000 ASTM A193 grade B16 Bolts, Screws.

Grade 1 No Grade Mark Bolts, Screws, Studs 60,000 Bolts, Screws, Studs ASTM A307 Grades A&B 60,000 STANDARD BOLT IDENTIFICATION MARKINGS Identification Grade Mark Specification Fastener Description Material Nominal Size Range (in.) This technical information is supplied as a courtesy.

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  Identification, Grade, Bolt, Marking, Bolt identification markings, Bolt identification markings identification grade

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