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.
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 95,000 75,000 125,000 115,000 100,000 ASTM A193 Grade B16 Bolts, Screws, Studs for High‐ Temperature
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