STANDARD BOLT IDENTIFICATION MARKINGS

1 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.

2 000 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, Studs forHigh Temperature ServiceCrMoVaAlloy Steel1 4 thru 2 Over 2 thru 4 Over 4 thru 7 105,00095,00085,000125,000115,000100,000 SAE J429 Grade 1 No Grade MarkBolts, Screws, Studs60,000 Bolts, Screws, StudsASTM A307 Grades A&B60,000 STANDARD bolt IDENTIFICATION MARKINGSI dentificationGrade MarkSpecificationFastenerDescriptionMate rialNominal SizeRange (in.)

3 This 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 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-Pro PropertiesPage 1 of 8 Proof Load(psi)Yield StrengthMin (psi)Tensile StrengthMin (psi) STANDARD bolt IDENTIFICATION MARKINGSI dentificationGrade MarkSpecificationFastenerDescriptionMate rialNominal SizeRange (in.)

4 This 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 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-Pro PropertiesASTM A193 Grade B8 Bolts, Screws, Studs forHigh Temperature ServiceAISI 3041 4 and Larger1 4 thru 3 4 Over 3 4 thru 1 Over 1 thru 1 Over 1 thru 1 30,000100,00080.

5 00065,00050,00075,000125,000115,000105,0 00100,000 ASTM A193 Grade B8 CBolts, Screws, Studs forHigh Temperature ServiceAISI 3471 4 and Larger1 4 thru 3 4 Over 3 4 thru 1 Over 1 thru 1 Over 1 thru 1 30,000100,00080,00065,00050,00075,000125 ,000115,000105,000100,000 ASTM A193 Grade B8 MBolts, Screws, Studs forHigh Temperature ServiceAISI 3161 4 and Larger1 4 thru 3 4 Over 3 4 thru 1 Over 1 thru 1 Over 1 thru 1 30,000100,00080,00065,00050,00075,000125 ,000115,000105,000100,000 ASTM A193 Grade B8 TBolts, Screws, Studs forHigh Temperature ServiceAISI 3211 4 and Larger1 4 thru 3 4 Over 3 4 thru 1 Over 1 thru 1 Over 1 thru 1 30,000100,00080,00065,00050,00075,000125 ,000115,000105,000100,000 ASTM A193 Grade B8 Bolts, Screws, Studs forHigh Temperature ServiceAISI 304 Strain Hard ened1 4 and Larger1 4 thru 3 4 Over 3 4 thru 1 Over 1 thru 1 Over 1 thru 1 30,000100,00080,00065,00050,00075,000125 ,000115,000105,000100,000 ASTM A193 Grade B8 CBolts, Screws.

6 Studs forHigh Temperature ServiceAISI 347 Strain Hard ened1 4 and Larger1 4 thru 3 4 Over 3 4 thru 1 Over 1 thru 1 Over 1 thru 1 30,000100,00080,00065,00050,00075,000125 ,000115,000105,000100,000 ASTM A193 Grade B8 MBolts, Screws, Studs forHigh Temperature ServiceAISI 316 Strain Hard ened1 4 thru 3 4 Over 3 4 thru 1 Over 1 thru 1 Over 1 thru 1 95,00080,00065,00050,000110,000100,00095 ,00090,000 ASTM A193 Grade B8 TBolts, Screws, Studs forHigh Temperature ServiceAISI 321 Strain Hard ened1 4 thru 3 4 Over 3 4 thru 1 Over 1 thru 1 Over 1 thru 1 100,00080,00065,00050,000125,000115,0001 05,000100,000 ASTM A320 Grade L7 Bolts, Screws, Studs forLow Temperature ServiceAISI 4140,4142, or41451 4 thru 2 105,000125,000 Page 2 of 8 Proof Load(psi)Yield StrengthMin (psi)Tensile StrengthMin (psi) STANDARD bolt IDENTIFICATION MARKINGSI dentificationGrade MarkSpecificationFastenerDescriptionMate rialNominal SizeRange (in.)

7 This 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 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-Pro PropertiesASTM A320 Grade L7 ABolts, Screws, Studs forLow Temperature ServiceAISI 40371 4 thru 2 105,000125,000 ASTM A320 Grade L7 BBolts, Screws.

8 Studs forLow Temperature ServiceAISI 41371 4 thru 2 105,000125,000 ASTM A320 Grade L7 CBolts, Screws, Studs forLow Temperature ServiceAISI 87401 4 thru 2 105,000125,000 ASTM A320 Grade L43 Bolts, Screws, Studs forLow Temperature ServiceAISI 43401 4 thru 4 105,000125,000 ASTM A320 Grade B8 Bolts, Screws, Studs forLow Temperature ServiceAISI 3041 4 and Larger 30,00075,000 ASTM A320 Grade B8 CBolts, Screws, Studs forLow Temperature ServiceAISI 3471 4 and Larger 30,00075,000 ASTM A320 Grade B8 TBolts, Screws, Studs forLow Temperature ServiceAISI 3211 4 and Larger 30,00075,000 ASTM A320 Grade B8 FBolts, Screws, Studs forLow Temperature ServiceAISI 303 or303Se1 4 and Larger 30,00075,000 ASTM A320 Grade B8 MBolts, Screws, Studs forLow Temperature ServiceAISI 3161 4 and Larger 30,00075,000 Page 3 of 8 Proof Load(psi)Yield StrengthMin (psi)Tensile StrengthMin (psi) STANDARD bolt IDENTIFICATION MARKINGSI dentificationGrade MarkSpecificationFastenerDescriptionMate rialNominal SizeRange (in.)

9 This 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 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-Pro PropertiesASTM A320 Grade B8 Bolts, Screws, Studs forLow Temperature ServiceAISI 3041 4 thru 3 4 Over 3 4 thru 1 Over 1 thru 1 Over 1 thru 1 100,00080,00065,00050,000100.

10 00080,00065,00050,000 ASTM A320 Grade B8 CBolts, Screws, Studs forLow Temperature ServiceAISI 3471 4 thru 3 4 Over 3 4 thru 1 Over 1 thru 1 Over 1 thru 1 100,00080,00065,00050,000100,00080,00065 ,00050,000 ASTM A320 Grade B8 TBolts, Screws, Studs forLow Temperature ServiceAISI 3161 4 thru 3 4 Over 3 4 thru 1 Over 1 thru 1 Over 1 thru 1 100,00080,00065,00050,000100,00080,00065 ,00050,000 ASTM A320 Grade B8 FBolts, Screws, Studs forLow Temperature ServiceAISI 3211 4 thru 3 4 Over 3 4 thru 1 Over 1 thru 1 Over 1 thru 1 100,00080,00065,00050,000100,00080,00065 ,00050,000 ASTM A320 Grade B8 MBolts, Screws, Studs forLow Temperature ServiceAISI 303 or303Se1 4 thru 3 4 Over 3 4 thru 1 Over 1 thru 1 Over 1 thru 1 100,00080,00065,00050,000100,00080,00065 ,00050,000 SAE J429 Grade 5 Bolts, ScrewsMedium Carbon Steel, Quenched and Tempered1 4 thru 1 Over 1 thru 1 85,00074,00092,00081,000120,000105,000 ASTM A449 Bolts, Screws, StudsMedium Carbon Steel.