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SAE J429 Grade 2 and 5 and 8 Hex Cap Screws

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  • Last update:

    2021-11-29 13:54

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Ningbo Steel Bolt Co., Ltd
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meos15064804(Mr.)  

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 telephone:

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Beijing

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Panjiashan, Xiepu Town, Zhenhai, Ningbo, China
Website:

http://www.ningbo-bolts.com/ http://meos15064804.xywj-cn.com/
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SAE J429

SAE J429 standard covers specifications to chemical, mechanical and other material requirements for inch-series carbon and alloy steel bolts, screws, studs, and U-bolts, used in automotive and related industries in sizes up-to 1-1/2 inch, inclusive.


SAE J429 Grades

Grade Designation

Products

Nominal Size Range Dia, Inch

1

Bolts, Screws, Studs

1/4 through 1-1/2

2

Bolts, Screws, Studs

1/4 through 1-1/2

3/4 through 1-1/2

4

Studs

1/4 through 1-1/2

5

Bolts, Screws, Studs

1/4 through 1

Over 1 through 1-1/2

5.2

Bolts, Screws

1/4 through 1

8

Bolts, Screws, Studs

1/4 through 1-1/2

8.1

Studs

1/4 through 1-1/2

8.2

Bolts, Screws, Studs

1/4 through 1


SAE J429 Chemical Composition

Grade

Nominal Size, Dia, Inch.

Material

C %

Mn %

P %

S %

B %

1

1/4 through 1-1/2

Low or medium carbon steel

0.55 max

…

0.025 max

0.025 max

…

2

1/4 through 1-1/2

Low or medium carbon steel

0.15 – 0.55

…

0.025 max

0.025 max

…

4

1/4 through 1-1/2

Medium carbon steel

0.28 – 0.55

…

0.025 max

0.13 max

…

5

1/4 through 1-1/2

Medium carbon steel

0.28 – 0.55

…

0.025 max

0.025 max (4)

…

Carbon steel with additives (e.g. Boron or Cr or Mn)

0.15 – 0.40

…

0.025 max

0.025 max (4)

0.0005 – 0.003

5.2

1/4 through 1

Low or medium carbon steel

0.15 – 0.25

0.74 max

0.025 max

0.025 max

0.0005 – 0.003

8

1/4 through 1-1/2

Medium carbon steel Or

0.25 – 0.55

…

0.025 max

0.025 max (4)

…

Alloy (6,7,8) Steel with additives (e.g. Boron or Cr or Mn)

0.20 – 0.55

…

0.025 max

0.025 max (4)

…

Medium carbon (6,7,8) Alloy Steel

0.28 – 0.55

…

0.025 max

0.025 max

…

8.1

1/4 through 1-1/2

Medium carbon alloy (6,7,8) or SAE 1541 steel

0.28 – 0.55

…

0.025 max

0.04 max

…

8.2

1/4 through 1

Low carbon boron steel (6)

0.15 – 0.25

0.74 max

0.025 max

0.025 max

0.0005 – 0.003

NOTES :

1. All values are for product analysis (percent by weight). For cast or heat analysis, use standard permissible varia-tions as shown in SAE J409.
2. For studs only, sulfur content may be 0.33% maximum.
3. For Grades 5 and 5.1, fasteners, medium carbon boron or medium carbon alloy steels, as specified for Grade 8 fasteners, may also be used at the manufacturer's option.
4. For studs only, sulfur content may be 0.13% maximum.
5. Grade 5 material heat treated before assembly with a hardened washer is an acceptable substitute.
6. When the carbon content in boron steel is less than 0.25% the minimum manganese shall be 0.60% for Grades 5, 5.1, and 5.2 and 0.70% for Grades 8, 8.1, and 8.2.
7. Alloy steel shall contain at least one of the following elements in the minimum quantity given: chromium 0.30%, nickel 0.30%, molybdenum 0.20%, vanadium 0.10%, manganese 1.65%. Where elements are specified in combi-nations of two, three, four, or five and have alloy contents less than those given above, the limit value to be applied for steel class determination is 70% of the sum of the individual limit values shown above for the two, three, four or five elements concerned.
8. When alloy steels are in the "as quenched" condition, prior to tempering, the microstructure in the core of the threaded section shall be approximately 90% martensite (refer to Table 3).
9. When boron is added the limits shall be 0.0005% to 0.003%.


SAE J429 Mechanical Requirements for Bolts, Screws and Studs

Grade Desig- nation

Prod ucts

Nominal Size Dia, In

Full Size's Bolts, Screws, Studs, Sems, Proof Load (Stress), psi

Full Size's Bolts, Screws, Studs, Sems, Tensile Strength (Stress) , Min, Ps'

Machine Test Specimens of Bolts, Screws, and Studs Yield's Strength (Stress) Min, psi

Machine Test Specimens of Bolts, Screws, and Studs Tensile Strength (Stress) Min, psi

Machine Test Specimens of Bolts, Screws, and Studs Elongation Min, %

Machine Test Specimens of Bolts, Screws, and Studs Reduction of Area Min, %

Surface Hardness Rockwell 30N Max

Core Hardness Rockwell Min

Core Hardness Rockwell Max

1

Bolts, Screws. Studs

1/4 thru 1-1/2

33,0000)

60,000

36,000

60,000

18

35


B70

B100

2

Bolts, Screws, Studs

1/4 thru 3/40)

55,0000)

74,000

57,000

74,000

18

35

-

680

B100

Over 3/4 thru 1-1/2

33,000

60,000

36,000

60,000

18

35

-

B70

B100

4

Studs

114 thru 1-1/2

65,000

1,15,000

1,00,000

1,15,000

10

35

-

C22

C32

5

Bolts, Screws, Studs

1/4 thru 1

85,000

1,20,000

92,000

1,20,000

14

35

54

C25

C34

Over 1 thru 1-1/2

74,000

1,05,000

81,000

1,05,000

14

35

50

C19

C30

5.1

SEMS

No. 4 thru 5/8

85,000

1,20,000

-

-

-

-

60.

C25

C40

5.2

Bolts, Screws

1/4 thru 1

85,000

1,20,000

92,000

1,20,000

14

35

56

C26


8

Bolts, Screws, Studs

1/4 1/2 ru th 1-

1,20,000

1,50,000

1,30,000

1,50,000

12

35

59.

33

39

8.1

Studs

1/4 thru 1-1/2

1,20,000

1,50,000

1,30,000

1,50,000

10

35

59.

C33

C39

8.2

Bolts, Screws

1/4 thru 1

1,20,000

1,50,000

1,30,000

1,50,000

10

35

59.

C33

C39

Note:

1. See footnote 2 of the Scope.
2. Yield strength is stress at which a permanent set of 0.2% of gage length occurs.
3. Not applicable to studs or slotted and cross recess head products.
4. Proof load test. Requirements in these grades only apply to stress relieved products.
5. Grade 2 requirements for sizes 1/4 through 3/4 in. apply only to bolts and screws 6 in. and shorter in lengths. For bolts and screws longer than 6 in., Grade 1 requirements shall apply.
6. Grade 5 material heat treatment before assembly with a hardened washer is an acceptable substitute.
7. "Full Size" means a tension test specimen consisting of a completed fastener for testing in the ready alteration.


SAE J429 Proof Load for Bolts, Screws and Studs

Nominal Dia of Product and Threads per in.

Stress Area, in2

Grade 1

Grade 2

Grade 4

Grade 5 & 5.2(2)

Grade 5.1

Grade 8,8.1, 8.2(2)

Proof Load, lb

Proof Load, lb

Proof Load, lb

Proof Load, lb

Proof Load, lb

Proof Load, lb

Coarse Thread Series UNC

No. 6-32

0.00909

-

-

-

-

750

-

8-32

0.0140

-

-

-

-

1,200

-

10-24

0.0175

-

-

-

-

1,500

-

12-24

0.0242

-

-

-

-

2,050

-

1/4-20

0.0318

1,050

1,750

2,050

2,700

2,700

3,800

5/16-18

0.0524

1,750

2,900

3,400

4,450

4,450

6,300

3/8-16

0.0775

2,550

4,250

5,050

6,600

6,600

9,300

7/16-14

0.1063

3,500

5,850

6,900

9,050

9,050

12,800

1/2-13

0.1419

4,700

7,800

9,200

12,100

12,100

17,000

9/16-12

5/8-11

3/4-10

7/8-9

1-8

0.182

0.226

0.334

0.462

0.606

6,000

7,450

11,000

15,200

20,000

10,000

12,400

18,400

15,200

20,000

11,800

14,700

21,700

30,000

39,400

15,500

19,200

28,400

39,300

51,500

15,500

19,200

-

-

-

21,800

27,100

40,100

55,400

72,700

1-1/8-7

1-1/4-7

1-3/8-6

1-1/2-6

0.763

0.969

1.155

1,405

25,200

32,000

38,100

46,400

25,200

32,000

38,100

46,400

49,600

63,000

75,100

91,300

56,500

71,700

85,500

104,000

-

-

-

-

91,600

116,300

138,600

168,600

Thread

No. 6-40

0.01015

-

-

-

-

850

-

8-36

0.01474

-

-

-

-

1,250

-

10-32

0.0200

-

-

-

-

1,700

-

12-28

0.0258

-

-

-

-

2,200

-

1/4-28

0.0364

1,200

2,000

2,350

3,100

3,100

4,350

5/16-24

0.0580

1,900

3,200

3,750

4,900

4,900

6,950

3/8-24

0.0878

2,900

4,800

5,700

7,450

7,450

10,500

7/16-20

1/2-20

0.1187

0.1599

3,900

5,300

6,550

8,800

7,700

10,400

10,100

13,600

10,100

13,600

14,200

19,200

9/16-18

5/8-18

3/4-16

7/8-14

1-12

0.203

0.256

0.373

0.509

0.663

6,700

8,450

12,300

16,800

21,900

11,200

14,100

20,500

16,800

21,900

13,200

16,600

24,200

33,100

43,100

17,300

21,800

31,700

43,300

56,400

17,300

21,800

-

-

-

24,400

30,700

44,800

61,100

79,600

1 14 UNS

0.679

22,400

22,400

44,100

57,700

-

81,500

1-1/8-12

0.856

28,200

28,200

55,600

63.300

-

102,700

1-1/4-12

1,073

35,400

35,400

69,700

79,400

-

128,800

1-3/8-12

1,315

43,400

43,400

85,500

97,300

-

157,800

1-1/2-12

1,581

52,200

52,200

102,800

117,000

-

189,700

Note:

1. Proof loads and tensile strengths are computed by multiplying the proof load stresses and tensile strength stresses given in Table 1 by the stress area of the thread. The stress area of sizes and thread series not included in Table 5 may be computed from the formula: As = 0.7854 [D - (0.9743/n)]2 where D equals nominal diameter in inches and n equals threads per inch.
2. Grades 5.2 and 8.2 applicable to sizes 1/4 through 1 in.


SAE J429 Tensile Strength for Bolts, Screws and Studs

Nominal Dia of Product and Threads per in.

Stress Area, in2

Grade 1

Grade 2

Grade 4

Grade 5 & 5.2(2)

Grade 5.1

Grade 8,8.1, 8.2(2)

Tensile Strength Min, lb

Tensile Strength Min. lb

Tensile Strength Min, lb

Tensile Strength Min, lb

Tensile Strength Min, lb

Tensile Strength Min, lb

Coarse Thread Series UNC

No. 6-32

0.00909

-

-

-

-

1,100

-

8-32

0.0140

-

-

-

-

1,700

-

10-24

0.0175

-

-

-

-

2,100

-

12-24

0.0242

-

-

-

-

2,900

-

1/4-20

0.0318

1,900

2,350

3,650

3,800

3,800

4,750

5/16-18

0.0524

3,150

3,900

6,000

6,300

6,300

7,850

3/8-16

0.0775

4,650

5,750

8,400

9,300

9,300

11,600

7/16-14

0.1063

6,400

7,850

12,200

12,800

12,800

15,900

1/2-13

0.1419

8,500

10,500

18,300

17,000

17,000

21,300

9/16-12
5/8-11
3/4-10
7/8-9
1-8

0.182
0.226
0.334
0.462
0.606

10,900
13,600
20,000
27,700
36,400

13,500
16,700
24,700
27,700
36,400

20,900
25,400
38,400
53,100
69,700

21,800
27,100
40,100
55,400
72,700

21,800
27,100
-
-
-

27,300
33,900
50,100
69,300
90,900

1-1/8-7
1-1/4-7
1-3/8-6
1-1/2-6

0.763
0.969
1.155
1,405

45,800
58,100
69,300
84,300

45,800
58,100
69,300
84,300

87,700
111,400
132,800
161,600

80,100
101,700
121,300
147,500

-
-
-
-

114,400
145,400
173,200
210,800

Fine Thread Series UNF

No. 6-40

0.01015

-

-

-

-

1,200

-

8-36

0.01474

-

-

-

-

1,750

-

10-32

0.0200

-

-

-

-

2,400

-

12-28

0.0258

-

-

-

-

3,100

-

1/4-28

0.0364

2,200

2,700

4,200

4,350

4,350

5,450

5/16-24

0.0580

3,500

4,300

6,700

6,950

6,950

8,700

3/8-24

0.0878

5,250

6,500

10,100

10,500

10,500

13,200

7/16-20
1/2-20

0.1187
0.1599

7,100
9,600

8,800
11,800

13,650
18,400

14,200
19,200

14,200
19,200

17,800
24,000

9/16-18
5/8-18
3/4-16
7/8-14
1-12

0.203
0.256
0.373
0.509
0.663

12,200
15,400
22,400
30,500
39,800

15,000
18,900
27,600
30,500
39,800

23,300
29,400
42,900
58,500
76,200

24,400
30,700
44,800
61,100
79,600

24,400
30,700
-
-
-

30,400
38,400
56,000
76,400
99,400

1 14 UNS

0.679

40,700

40,700

78,100

81,500

-

101,900

1-1/8-12

0.856

51,400

51,400

98,400

89,900

-

128,400

1-1/4-12

1,073

64,400

64,400

123,400

112,700

-

161,000

1-3/8-12

1,315

78,900

78,900

151,200

138,100

-

197,200

1-1/2-12

1,581

94,900

94,900

181,800

166,000

-

237,200

SAE J429 Bolts Grade Identification Mark

Grade

Identification Mark

1

None

2

None
None

4

None

5

5.2

8

8.1

None

8.2


Reference Documents

· SAE J403

· SAE J404

· SAE J1268

· ASTM F2328

· ASTM F606

· ASTM F1470

· ASME B18.18.2





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