Bolt Identification Markings

Mechanical Properties

Proof Load(psi)

Yield StrengthMin (psi)

Tensile StrengthMin (psi)

Nominal SizeRange (in.)MaterialSpecifica-

tionFastener

DescriptionIdentificationGrade Mark

Bolt Identification Markings

ASTM A193Grade B8M

ASTM A193Grade B8T

ASTM A193Grade B8

ASTM A320Grade L7

ASTM A193Grade B8C

ASTM A320Grade L7A

ASTM A193Grade B8M

ASTM A320Grade L7B

ASTM A320Grade L43

ASTM A193Grade B8T

ASTM A320Grade L7C

AISI 316

AISI 321

AISI 304Strain-Hard-

AISI 4140,4142, or

AISI 4037

AISI 4137

AISI 4340

AISI 8740

1⁄4 and Larger

1⁄4 thru 21⁄2

1⁄4 thru 4

1⁄4 thru 3⁄4

Over 3⁄4 thru 1Over 1 thru 11⁄4

Over 11⁄4 thru 11⁄2

1⁄4 thru 3⁄4

−−−−−−−−

−−

30,000

105,000

100,000 80,000 65,000 50,000

95,00080,00065,00050,000

100,000 80,000 65,000 50,000

125,000115,000105,000100,000

110,000100,000 95,000 90,000

125,000115,000105,000100,000

75,000

125,000

SAE J429Grade 1

Low- or Medium-Carbon

ASTM A307Grades A&B

Bolts,Screws,Studs

Low-Carbon Steel

SAE J429Grade 2

SAE J429Grade 4

ASTM A193Grade B5

ASTM A193Grade B6

ASTM A193Grade B7

ASTM A193Grade B16

ASTM A193Grade B8C

ASTM A193Grade B8

Low- or Medium-Carbon

55,00033,000

57,00036,000

74,00060,000

Medium-Carbon Cold-Drawn

AISI 501

AISI 410

AISI 4140,4142, or

CrMoVaAlloy Steel

AISI 347

AISI 304

No Grade Mark

1⁄4 thru 11⁄2

1⁄4 thru 4

1⁄4 thru 21⁄2Over 21⁄2 thru 4Over 4 thru 7

33,000

−−

−−−−−−

−−

36,000

100,000

80,000

85,000

105,000 95,000 75,000

105,000 95,000 85,000

60,000

115,000

100,000

110,000

125,000115,000100,000

1⁄4 thru 4

1⁄4 thru 3⁄4

Bolts,Screws,Studs

forHigh-

TemperatureService

Bolts,Screws,Studs

forLow-

TemperatureService

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Proof Load(psi)

tionFastener

ASTM A320Grade B8C

ASTM A320Grade B8

ASTM A320Grade B8T

ASTM A320Grade B8F

ASTM A320Grade B8M

SAE J429Grade 5.2

ASTM A325Type 1

ASTM A325Type 2

ASTM A325Type 3

ASTM A354Grade BB

ASTM A354Grade BC

ASTM J429Grade 7

AISI 347

AISI 304

AISI 321

AISI 316

AISI 303 or303Se

AISI 321

AISI 316

AISI 303 or 303Se

1⁄4 and Larger −− 30,000 75,000

B8M Bolts,Screws,Studs

forLow-

TemperatureService

Bolts,Screws,Studs

High-Strength Structural

Bolts, Studs

Bolts and Screws

Bolts, Screws, Studs

1⁄4 thru 3⁄4

−−−−−−−−

−−

100,00080,00065,00050,000

SAE J429Grade 5

SAE J429Grade 8

SAE J429Grade 5.1

ASTM A449

ASTM A354Grade BD

Medium-Carbon Steel, Quenched and

Tempered

Low- or Medium-

Carbon Steel, Quenched and

Tempered

Low-Carbon Marten-

sitic Steel, Quenched and

Tempered

Medium-Carbon Steel, Quenched and

Tempered

Low-Carbon Marten-

sitic Steel, Quenched and

Tempered

Atmospheric-Corrosion-

Resisting Steel, Quenched and

Tempered

Alloy Steel, Quenched and

Tempered

Medium-Carbon Alloy Steel,

Quenched and Tempered

Alloy Steel, Quenched and

Tempered

1⁄4 thru 1Over 1 thru 11⁄2

1⁄4 thru 1

#6 thru 3⁄8

1⁄4 thru 1Over 1 thru 11⁄2

Over 11⁄2 thru 3

1⁄2 thru 111⁄8 thru 11⁄2

1⁄2 thru 1

1⁄2 thru 111⁄8 thru 11⁄2

1⁄4 thru 21⁄2

23⁄4 thru 4

1⁄4 thru 21⁄2

23⁄4 thru 4

1⁄4 thru 11⁄2

85,00074,000

85,00074,00055,000

85,00074,000

85,000

85,00074,000

80,00075,000

105,000 95,000

105,000

120,000

85,000

92,00081,000

92,00081,00058,000

92,00081,000

92,000

92,00081,000

83,00078,000

109,000 99,000

115,000

130,000

92,000

120,000105,000

120,000105,000 90,000

120,000105,000

120,000

120,000105,000

105,000100,000

125,000115,000

133,000

150,000

120,000

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Proof Load(psi)

tionFastener

SAE J429Grade 8.1

ASTM A490

ISO R898Class 4.6

ISO R898Class 5.8

ISO R898Class 8.8

ISO R898Class 10.9

High-Strength Structural

Medium-Carbon Alloy or SAE

1041 Modified Elevated-Tem-perature Drawn

Alloy Steel, Quenched and Tem-

Low- or Medium-

Carbon Steel, Quenched and Tem-

Medium-Carbon Steel,

Quenched and Tem-

Alloy Steel, Quenched and Tem-

No Grade Mark

1⁄4 thru 11⁄2

1⁄2 thru 11⁄2

All sizes thru 11⁄2

130,000

36,000

57,000

92,000

130,000

120,000

33,000

55,000

85,000

120,000

120,000 130,000

150,000

60,000

74,000

120,000

150,000

150,000 min170,000 maxA490

Bolts,Screws,Studs

Nut Identification Markingsbegin on the following page.

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HardnessRockwell

Proof Load(ksi) Min Max

Nominal SizeRange (in.)MaterialSpecificationIdentification

Grade Mark

Nut Identification MarkingsSeeNote

ASTM A563Grade O

Carbon Steel

Carbon Steel; May be Quenched and

Tempered

Atmospheric-Cor-rosion-Resistant Steel; May be Quenched and

Tempered

Carbon Steel; May be Quenched and

Tempered

Carbon Steel, Quenched and

Tempered

Atmospheric-Cor-rosion-Resistant Steel, Quenched

and Tempered

Carbon Steel

Medium-Carbon Steel

Medium-Carbon Steel, Quenched and Tempered

Stainless AISI 304

Stainless AISI 316

ASTM A563Grade A

ASTM A563Grade C

ASTM A563Grade C3

ASTM A563Grade D

ASTM A563Grade DH

ASTM A563Grade DH3

ASTM A194Grade 1

ASTM A194Grade 4

ASTM A194Grade 7

ASTM A194Grade 8

ASTM A194Grade 7M

ASTM A194Grade 8M

ASTM A194Grade 2

ASTM A194Grade 2H

ASTM A194Grade 2HM

ASTM A563Grade B

No Grade Mark

1⁄4 thru 11⁄2

1⁄4 thru 4

1⁄4 thru 1

Over 1 thru 11⁄2

−−

NOTES:

1. In addition to the indicated grade marking, all grades, except A563 Grades O, A, and B, must be marked for manufacturer indentification.

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 the nut must be additionally marked with the letter “B.”

3. Nuts are not required to be marked unless specified by the purchaser. When marked, the identifica-tion marking shall be the grade letter 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 Nuts ASTM A194/A194M: Carbon and Alloy Steel Nuts for Bolts for High-Pressure and High-Tempera-

ture Service

Other, less common, grades exist but are not listed here.

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Bolt Identification Markings

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