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.
High‐ Temperature Service ASTM A193 Grade B6 Bolts, Screws, Studs for High‐ Temperature Service ASTM A193 Grade B7 Bolts, Screws, Studs for High‐ Temperature Service AISI 4140, 4142, or 4145 1⁄4 thru 2 ½ Over 2 ½ thru 4 Over 4 thru 7 −− −− −− 105,000 …
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