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General Information, Facts & Tables
[Bolt Head Markings]

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Overview

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Images 1 - 32 are bolt head markings, images 32 - 45 are nut markings.
 

Bolt Head Images

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Image of various bolt and nut markings 

Designations

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ID#

Specification

Material

1

ASTM A307 Grade A

Low Carbon Steel

1

ASTM A307 Grade B

Low Carbon Steel

1

ISO R898 Class 4.6

Medium Carbon Steel, Quenched and Tempered

1

ISO R898 Class 5.8

Medium Carbon Steel, Quenched and Tempered

1

SAE J429 Grade 1

Low or Medium Carbon Steel

1

SAE J429 Grade 2

Low or Medium Carbon Steel

1

SAE J429 Grade 4

Medium Carbon Cold Drawn Steel

1

SAE J429 Grade 8.1

Medium carbon alloy or SAE 1041 modified elevated temperature drawn steel

2

ASTM A193 Grade B5

AISI 501

3

ASTM A193 Grade B6

AISI 410

4

ASTM A193 Grade B7

AISI 4140, 4142 or 4105

5

ASTM A193 Grade B8

AISI 304

5

ASTM A320 Grade B8

AISI 304

6

ASTM A193 Grade B16

CrMoVa Alloy Steel

7

ASTM A193 Grade B8C

AISI 347

7

ASTM A320 Grade B8C

AISI 347

8

ASTM A320 Grade B8F

AISI 303 or 303se

9

ASTM A193 Grade B8M

AISI 316

9

ASTM A320 Grade B8M

AISI 316

10

ASTM A193 Grade B8T

AISI 321

10

ASTM A320 Grade B8T

AISI 321

11

ASTM A193 Grade B8

AISI 304 Strain Hardened

12

ASTM A193 Grade B8C

AISI 347 Strain Hardened

13

ASTM A193 Grade B8M

AISI 316 Strain Hardened

14

ASTM A193 Grade B8T

AISI 321 Strain Hardened

15

ASTM A320 Grade L7

AISI 4140, 4142 0r 4145

16

ASTM A320 Grade L7A

AISI 4037

17

ASTM A320 Grade L7B

AISI 4137

18

ASTM A320 Grade L7C

AISI 8740

19

ASTM A320 Grade L43

AISI 4340

20

ASTM A449

Medium Carbon Steel, Quenched and Tempered

20

SAE J429 Grade 5

Medium Carbon Steel, Quenched and Tempered

21

SAE J429 Grade 5.1

Low or Medium Carbon Steel, Quenched and Tempered

22

SAE J429 Grade 5.2

Low Carbon Martensitic Steel, Quenched and Tempered

23

SAE J429 Grade 7

Medium carbon alloy steel, quenched and tempered

24

ASTM A354 Grade BD

Alloy steel, quenched and tempered

24

SAE J429 Grade 8

Medium carbon alloy steel, quenched and tempered

25

ASTM A325 Type 1

Medium Carbon Steel, Quenched and Tempered

26

ASTM A325 Type 2

Low Carbon Martensitic Steel, Quenched and Tempered

27

ASTM A325 Type 3

Atmospheric corrosion resisting steel, quenched and tempered

28

ASTM A490

Alloy steel, quenched and tempered

29

ISO R898 Class 8.8

Alloy steel, quenched and tempered

30

ASTM A354 Grade BB

Alloy steel, quenched and tempered

30

ISO R898 Class 10.9

Alloy steel, quenched and tempered

32

ASTM A354 Grade BC

Alloy steel, quenched and tempered

33

ASTM A563 Grade 0

Carbon steel

33

ASTM A563 Grade A

Carbon steel

33

ASTM A563 Grade B

Carbon steel

34

ASTM A563 Grade C

Carbon steel (may be quenched and tempered)

35

ASTM A563 Grade C3

Atmospheric corrosion resisting steel, may be quenched and tempered

36

ASTM A563 Grade D

Carbon steel (may be quenched and tempered)

37

ASTM A563 Grade DH

Carbon steel, quenched and tempered

38

ASTM A563 Grade DH3

Atmospheric corrosion resisting steel, quenched and tempered

39

ASTM A194 Grade 1

Carbon steel

40

ASTM A194 Grade 2

Medium carbon steel

41

ASTM A194 Grade 2H

Medium carbon steel, quenched and tempered

42

ASTM A194 Grade 2HM

Medium carbon steel, quenched and tempered

43

ASTM A194 Grade 4

Medium carbon alloy steel, quenched and tempered

44

ASTM A194 Grade 7

Medium carbon alloy steel, quenched and tempered

45

ASTM A194 Grade 7M

Medium carbon alloy steel, quenched and tempered