Transcription of STANDARD BOLT IDENTIFICATION MARKINGS
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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.
Grade B16 Bolts, Screws, Studs for High‐ Temperature Service CrMoVa Alloy Steel 1⁄4 thru 2 ½ Over 2 ½ thru 4 Over 4 thru 7 −− −− −− 105,000 95,000 85,000 125,000 115,000 100,000 SAE J429 Grade 1 No Grade Mark Bolts, Screws, Studs 60,000 Bolts, Screws, Studs ASTM A307 Grades A&B 60,000
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