STANDARD BOLT IDENTIFICATION MARKINGS

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STANDARD BOLT IDENTIFICATION MARKINGSThis technical information is supplied as a courtesy. All-Pro Threaded neither employs nor maintains an engineering or technical staff, and All-Pro is merely supplying certainmanufacturing, technical, and/or design specifications and data received by All-Pro Threaded from the products’ manufacturer or taken from consensus standards, and is in nomanner originated, developed, created, enhanced, altered, or approved by All-Pro Threaded.IdentificationGrade MarkSpecificationFastenerDescriptionSAE J429Grade 1Low‐ orMedium‐Carbon SteelLow‐CarbonSteelNominal SizeRange (in.)1/4 THRU 1 ½Mechanical PropertiesProof Load(psi)Yield StrengthMin (psi)33,00036,000Tensile StrengthMin (psi)60,0001 4 thru 4 Low‐ orMedium‐Carbon Steel1 4 thru 3 4Over 3 4 thru 1 bon Cold‐Drawn Steel1 4 thru 1 ½ 100,000115,000Low‐ orMedium‐Carbon Steel1/4 THRU 1 ½33,00036,000Low‐CarbonSteel1 4 thru 4 Low‐ orMedium‐Carbon Steel1 4 thru 3 4Over 3 4 thru 1 ½55,00033,00057,00036,00074,00060,000ASTM A193Grade B5Bolts, Screws,Studs forHigh‐TemperatureServiceAISI 5011 4 thru 4 80,000100,000ASTM A193Grade B6Bolts, Screws,Studs forHigh‐TemperatureServiceAISI 4101 4 thru 4 85,000110,000ASTM A193Grade B7Bolts, Screws,Studs forHigh‐TemperatureServiceAISI 4140,4142, or41451 4 thru 2 ½Over 2 ½ thru 4Over 4 thru 7 105,00095,00075,000125,000115,000100,000ASTM A193Grade B16Bolts, Screws,Studs forHigh‐TemperatureServiceCrMoVaAlloy Steel1 4 thru 2 ½Over 2 ½ thru 4Over 4 thru 7 105,00095,00085,000125,000115,000100,000Bolts, Screws,StudsNo GradeMarkMaterialSAE J429Grade 2SAE J429Grade 4StudsNo GradeMarkASTM A307Grades A&BBolts, Screws,Studs60,000Page 1 of 8

STANDARD BOLT IDENTIFICATION MARKINGSThis technical information is supplied as a courtesy. All-Pro Threaded neither employs nor maintains an engineering or technical staff, and All-Pro is merely supplying certainmanufacturing, technical, and/or design specifications and data received by All-Pro Threaded from the products’ manufacturer or taken from consensus standards, and is in nomanner originated, developed, created, enhanced, altered, or approved by All-Pro Threaded.IdentificationGrade MarkSpecificationFastenerDescriptionASTM A193Grade B8Bolts, Screws,Studs forHigh‐TemperatureServiceASTM A193Grade B8CBolts, Screws,Studs forHigh‐TemperatureServiceASTM A193Grade B8MBolts, Screws,Studs forHigh‐TemperatureServiceMaterialNominal SizeRange (in.)Mechanical PropertiesProof Load(psi)Yield StrengthMin (psi)Tensile StrengthMin (psi)AISI 3041 4 and Larger1 4 thru 3 4Over 3 4 thru 1Over 1 thru 1 ¼Over 1 ¼ thru 1 ½ 0105,000100,000AISI 3471 4 and Larger1 4 thru 3 4Over 3 4 thru 1Over 1 thru 1 ¼Over 1 ¼ thru 1 ½ 0105,000100,000AISI 3161 4 and Larger1 4 thru 3 4Over 3 4 thru 1Over 1 thru 1 ¼Over 1 ¼ thru 1 ½ 0105,000100,000ASTM A193Grade B8TBolts, Screws,Studs forHigh‐TemperatureServiceAISI 3211 4 and Larger1 4 thru 3 4Over 3 4 thru 1Over 1 thru 1 ¼Over 1 ¼ thru 1 ½ 0105,000100,000ASTM A193Grade B8Bolts, Screws,Studs forHigh‐TemperatureServiceAISI 304Strain‐Hard‐ened1 4 and Larger1 4 thru 3 4Over 3 4 thru 1Over 1 thru 1 ¼Over 1 ¼ thru 1 ½ 0105,000100,000ASTM A193Grade B8CBolts, Screws,Studs forHigh‐TemperatureServiceAISI 347Strain‐Hard‐ened1 4 and Larger1 4 thru 3 4Over 3 4 thru 1Over 1 thru 1 ¼Over 1 ¼ thru 1 ½ 0105,000100,000ASTM A193Grade B8MBolts, Screws,Studs forHigh‐TemperatureServiceAISI 316Strain‐Hard‐ened1 4 thru 3 4Over 3 4 thru 1Over 1 thru 1 ¼Over 1 ¼ thru 1 ½ ASTM A193Grade B8TBolts, Screws,Studs forHigh‐TemperatureServiceAISI 321Strain‐Hard‐ened1 4 thru 3 4Over 3 4 thru 1Over 1 thru 1 ¼Over 1 ¼ thru 1 ½ 000ASTM A320Grade L7Bolts, Screws,Studs forLow‐TemperatureServiceAISI 4140,4142, or41451 4 thru 2 ½ 105,000125,000Page 2 of 8

STANDARD BOLT IDENTIFICATION MARKINGSThis technical information is supplied as a courtesy. All-Pro Threaded neither employs nor maintains an engineering or technical staff, and All-Pro is merely supplying certainmanufacturing, technical, and/or design specifications and data received by All-Pro Threaded from the products’ manufacturer or taken from consensus standards, and is in nomanner originated, developed, created, enhanced, altered, or approved by All-Pro Threaded.IdentificationGrade l SizeRange (in.)ASTM A320Grade L7ABolts, Screws,Studs forLow‐TemperatureServiceAISI 4037ASTM A320Grade L7BBolts, Screws,Studs forLow‐TemperatureServiceMechanical PropertiesProof Load(psi)Yield StrengthMin (psi)Tensile StrengthMin (psi)1 4 thru 2 ½ 105,000125,000AISI 41371 4 thru 2 ½ 105,000125,000ASTM A320Grade L7CBolts, Screws,Studs forLow‐TemperatureServiceAISI 87401 4 thru 2 ½ 105,000125,000ASTM A320Grade L43Bolts, Screws,Studs forLow‐TemperatureServiceAISI 43401 4 thru 4 105,000125,000ASTM A320Grade B8Bolts, Screws,Studs forLow‐TemperatureServiceAISI 3041 4 and Larger 30,00075,000ASTM A320Grade B8CBolts, Screws,Studs forLow‐TemperatureServiceAISI 3471 4 and Larger 30,00075,000ASTM A320Grade B8TBolts, Screws,Studs forLow‐TemperatureServiceAISI 3211 4 and Larger 30,00075,000ASTM A320Grade B8FBolts, Screws,Studs forLow‐TemperatureServiceAISI 303 or303Se1 4 and Larger 30,00075,000ASTM A320Grade B8MBolts, Screws,Studs forLow‐TemperatureServiceAISI 3161 4 and Larger 30,00075,000Page 3 of 8

STANDARD BOLT IDENTIFICATION MARKINGSThis technical information is supplied as a courtesy. All-Pro Threaded neither employs nor maintains an engineering or technical staff, and All-Pro is merely supplying certainmanufacturing, technical, and/or design specifications and data received by All-Pro Threaded from the products’ manufacturer or taken from consensus standards, and is in nomanner originated, developed, created, enhanced, altered, or approved by All-Pro Threaded.IdentificationGrade MarkSpecificationFastenerDescriptionASTM A320Grade B8Bolts, Screws,Studs forLow‐TemperatureServiceASTM A320Grade B8CBolts, Screws,Studs forLow‐TemperatureServiceASTM A320Grade B8TBolts, Screws,Studs forLow‐TemperatureServiceMaterialNominal SizeRange (in.)Mechanical PropertiesProof Load(psi)Yield StrengthMin (psi)Tensile StrengthMin (psi)AISI 3041 4 thru 3 4Over 3 4 thru 1Over 1 thru 1 ¼Over 1 ¼ thru 1 ½ AISI 3471 4 thru 3 4Over 3 4 thru 1Over 1 thru 1 ¼Over 1 ¼ thru 1 ½ AISI 3161 4 thru 3 4Over 3 4 thru 1Over 1 thru 1 ¼Over 1 ¼ thru 1 ½ ASTM A320Grade B8FBolts, Screws,Studs forLow‐TemperatureServiceAISI 3211 4 thru 3 4Over 3 4 thru 1Over 1 thru 1 ¼Over 1 ¼ thru 1 ½ ASTM A320Grade B8MBolts, Screws,Studs forLow‐TemperatureServiceAISI 303 or303Se1 4 thru 3 4Over 3 4 thru 1Over 1 thru 1 ¼Over 1 ¼ thru 1 ½ SAE J429Grade 5Bolts, ScrewsMedium‐Carbon Steel,Quenched andTempered1 4 thru 1Over 1 thru 1 ½85,00074,00092,00081,000120,000105,000ASTM A449Bolts, Screws,StudsMedium‐Carbon Steel,Quenched andTempered1 4 thru 1Over 1 thru 1 ½Over 1 ½ thru 090,000SemsLow‐ orMedium‐Carbon Steel,Quenched andTempered#6 thru 3 885,000 120,000Bolts, ScrewsLow‐CarbonMarten‐ siticSteel,Quenched andTempered1 4 thru 185,00092,000120,000SAE J429Grade 5.1SAE J429Grade 5.2Page 4 of 8

STANDARD BOLT IDENTIFICATION MARKINGSThis technical information is supplied as a courtesy. All-Pro Threaded neither employs nor maintains an engineering or technical staff, and All-Pro is merely supplying certainmanufacturing, technical, and/or design specifications and data received by All-Pro Threaded from the products’ manufacturer or taken from consensus standards, and is in nomanner originated, developed, created, enhanced, altered, or approved by All-Pro Threaded.IdentificationGrade l SizeRange (in.)ASTM A325Type 1High‐StrengthStructural BoltsMedium‐Carbon Steel,Quenched andTemperedYield StrengthMin (psi)Tensile StrengthMin (psi)1 2 thru 11 1/8 thru 1 engthStructural BoltsLow‐CarbonMarten‐ siticSteel,Quenched andTempered1 2 thru 185,00092,000120,000ASTM A325Type 3High‐StrengthStructural BoltsAtmospheric‐Corrosion‐Resisting Steel,Quenched andTempered1 2 thru 11 1/8 thru 1185,00074,00092,00081,000120,000105,000ASTM A354Grade BBBolts, StudsAlloy Steel,Quenched andTempered1 4 thru 2 ½2 ¾ thru 480,00075,00083,00078,000105,000100,000ASTM A354Grade BCBolts, StudsAlloy Steel,Quenched andTempered1 4 thru 2 ½2 ¾ thru 4105,00095,000109,00099,000125,000115,000Bolts andScrewsMedium‐Carbon AlloySteel,Quenched andTempered1 4 thru 1 ½105,000115,000133,000Bolts, ScrewsAlloy Steel,Quenched andTempered1 4 thru 1 ½120,000130,000150,000StudsMedium‐Carbon Alloy orSAE 1041ModifiedElevated‐TemperatureDrawn Steel1 4 thru 1 ½120,000130,000150,000ASTM A325Type 2ASTM J429Grade 7SAE J429Grade 8ASTM A354Grade BDSAE J429Grade 8.1No Grade MarkMechanical PropertiesProof Load(psi)Page 5 of 8

STANDARD BOLT IDENTIFICATION MARKINGSThis technical information is supplied as a courtesy. All-Pro Threaded neither employs nor maintains an engineering or technical staff, and All-Pro is merely supplying certainmanufacturing, technical, and/or design specifications and data received by All-Pro Threaded from the products’ manufacturer or taken from consensus standards, and is in nomanner originated, developed, created, enhanced, altered, or approved by All-Pro Threaded.IdentificationGrade l SizeRange (in.)ASTM A490High‐StrengthStructural BoltsAlloy Steel,Quenched andTemperedISO R898Class 4.6Bolts,Screws,StudsMechanical PropertiesProof Load(psi)Yield StrengthMin (psi)Tensile StrengthMin (psi)1 2 thru 1 ½120,000130,000150,000 min170,000 maxLow‐ orMedium‐Carbon Steel,Quenched andTemperedAll sizes through 1 ½33,00036,00060,000ISO R898Class 5.8Bolts,Screws,StudsLow‐ orMedium‐Carbon Steel,Quenched andTemperedAll sizes through 1 ½55,00057,00074,000ISO R898Class 8.8Bolts,Screws,StudsMedium‐Carbon Steel,Quenched andTemperedAll sizes through 1 ½85,00092,000120,000ISO R898Class 10.9Bolts,Screws,StudsAlloy Steel,Quenched andTemperedAll sizes through 1 ½120,000130,000150,000No Grade MarkNo Grade MarkAll‐Pro Threaded Head MarkingPage 6 of 8

STANDARD NUT IDENTIFICATION MARKINGSThis technical information is supplied as a courtesy. All-Pro Threaded neither employs nor maintains an engineering or technical staff, and All-Pro ismerely supplying certain manufacturing, technical, and/or design specifications and data received by All-Pro Threaded from the products’manufacturer or taken from consensus standards, and is in no manner originated, developed, created, enhanced, altered, or approved by All-ProThreaded.IdentificationGrade MarkNo Grade MarkSpecificationMaterialASTM A563Grade AASTM A563Grade AASTM A563Grade BCarbon SteelASTM A563Grade CNominal SizeRange (in.)Proof Load(psi)Hardness RockwellMinMax69B55C3269B55C32B69C32See Note1/4 thru 1 1/23,41/4 thru 1Over 1 thru 1 1/2120Carbon Steel; Maybe Quenched andTempered1 4 thru 4144B78C385ASTM A563Grade C3Atmospheric‐Corrosion‐ResistantSteel; May beQuenched andTempered1 4 thru 4144B78C385, 9ASTM A563Grade DCarbon Steel; Maybe Quenched andTempered1 4 thru 4150B84C386ASTM A563Grade DHCarbon Steel,Quenched andTempered1 4 thru 4175C24C386ASTM A563Grade DH3Atmospheric‐Corrosion‐ResistantSteel, Quenchedand Tempered1 4 thru 4175C24C385,9ASTM A194Grade 1Carbon Steel1 4 thru 4130B70‐‐‐‐‐7ASTM A194Grade 2Medium‐CarbonSteel1 4 thru 41501593527,8ASTM A194Grade 2HMedium‐CarbonSteel, Quenchedand Tempered1 4 thru 4175C24C387105Page 7 of 8

STANDARD NUT IDENTIFICATION MARKINGSThis technical information is supplied as a courtesy. All-Pro Threaded neither employs nor maintains an engineering or technical staff, and All-Pro ismerely supplying certain manufacturing, technical, and/or design specifications and data received by All-Pro Threaded from the products’manufacturer or taken from consensus standards, and is in no manner originated, developed, created, enhanced, altered, or approved by All-ProThreaded.IdentificationGrade MarkSpecificationMaterialNominal SizeRange (in.)Proof Load(psi)ASTM A194Grade 2HMMedium‐CarbonSteel, Quenchedand Tempered1 4 thru 4ASTM A194Grade 4Medium‐CarbonAlloy Steel,Quenched andTemperedASTM A194Grade 7Hardness RockwellSee NoteMinMax1501592377,81 4 thru 4175C24C387Medium‐CarbonAlloy Steel,Quenched andTempered1 4 thru 4175C24C387ASTM A194Grade 7MMedium‐CarbonAlloy Steel,Quenched andTempered1 4 thru 41501592377ASTM A194Grade 8Stainless AISI 3041 4 thru 48012630010ASTM A194Grade 8MStainless AISI 3161 4 thru 48012630010All‐Pro Threaded Head MarkingNOTES:1. In addition to the indicated grade marking, all grades, except A563 Grades O, A, and B, must be marked for manufacturerindentification.2. The markings shown for all grades of A194 nuts are for cold‐formed and hot‐forged nuts. When nuts are machined from bar stock thenut must be additionally marked with the letter “B.”3. Nuts are not required to be marked unless specified by the purchaser. When marked, the identification marking shall be the gradeletter O, A, or B.4. Properties shown are those of non‐plated or non‐coated coarse‐thread hex nuts.5. Properties shown are those of coarse‐thread heavy hex nuts.6. Properties shown are those of coarse‐thread heavy hex nuts.7. Properties shown are those of coarse 8‐thread heavy hex nuts.8. Hardnesses are Brinell Hardness numbers.9. The nut manufacturer, at his option, may add other markings to indicate the use of atmospheric‐corrosion‐resistant steel.10. Nuts that are carbide‐solution‐treated require additional letter A–8A or 8MA.11. Specifications:ASTM A563: Carbon and Alloy Steel NutsASTM A194/A194M: Carbon and Alloy Steel Nuts for Bolts for High‐Pressure and High‐Temperature ServiceOther, less common, grades exist but are not listed here.Page 8 of 8

Proof Load (psi) Yield Strength Min (psi) Tensile Strength Min (psi) Low‐ or Medium‐

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