Fastener Strengths

Standard (Inch) Fastener Strengths

 

Grade 2

Grade 5

Grade 8

ASTM A 574

Nominal
Diameter

Stress
Area (in2)

Proof
Load
(lbf)

Ultimate
Load
Min. (lbf)

Proof
Load
(lbf)

Ultimate
Load
Min. (lbf)

Proof
Load
(lbf)

Ultimate
Load
Min. (lbf)

Proof
Load
( lbf)

Ultimate
Load
Min. (lbf)

#0 - 80

0.00180

63

133

153

216

216

270

243

306

#1 - 64

0.00263

92

195

224

316

316

395

368

473

1 - 72

0.00278

97

206

236

334

334

417

375

473

#2 - 56

0.00370

130

274

315

444

444

555

518

666

2 - 64

0.00394

138

292

335

473

473

591

532

670

#3 - 48

0.00487

170

360

414

584

584

731

682

877

3 - 56

0.00523

183

387

445

628

628

785

706

889

#4 - 40

0.00604

211

447

513

725

725

906

846

1,090

4 - 48

0.00661

231

489

562

793

793

992

892

1,124

#5 - 40

0.00796

279

589

677

955

955

1,194

1,110

1,430

5 - 44

0.00830

291

614

706

996

996

1,245

1,121

1,411

#'6 - 32

0.00909

318

673

773

1,091

1,091

1,364

1,270

1,640

6 - 40

0.01015

355

751

863

1,218

1,218

1,523

1,370

1,726

#8- 3 2

0.0140

490

1,036

1,190

1,680

1,680

2,100

1,960

2,520

8 - 36

0.01474

516

1,091

1,253

1,769

1,769

2,211

1,990

2,506

#10 - 24

0.0175

613

1,295

1,488

2,100

2,100

2,625

2,450

3,150

10 - 32

0.0200

700

1,480

1,700

2,400

2,400

3,000

2,700

3,400

#12 - 24

0.0242

847

1,791

2,057

2,904

2,904

3,630

3,267

4,114

12 - 28

0.0258

903

1,909

2,193

3,096

3,096

3,870

3,483

4,386

1/4 - 20

0.0318

1,750

2,350

2,700

3,800

3,800

4,750

4,450

5,730

1/4 - 28

0.0364

2,000

2,700

3,100

4,350

4,350

5,450

4,915

6,188

5/16 - 18

0.0524

2,900

3,900

4,450

6,300

6,300

7,850

7,340

9,440

5/16 - 24

0.0580

3,200

4,300

4,900

6,950

6,950

8,700

7,831

9,860

3/8 - 16

0.0775

4,250

5,750

6,600

9,300

9,300

11,600

10,800

13,900

3/8 - 24

0.0878

4,800

6,500

7,450

10,500

10,500

13,200

11,854

14,926

7/16 - 14

0.1063

5,850

7,850

9,050

12,800

12,800

15,900

14,900

19,100

7/16 - 20

0.1187

6,550

8,800

10,100

14,200

14,200

17,800

16,026

20,179

1/2 - 13

0.1419

7,800

10,500

12,100

17,000

17,000

21,300

19,900

25,500

1/2 - 20

0.1599

8,800

11,800

13,600

19,200

19,200

24,000

21,589

27,183

9/16 - 12

0.182

10,000

13,500

15,500

21,800

21,800

27,300

24,573

30,940

9/16 - 18

0.203

11,200

15,000

17,300

24,400

24,400

30,400

27,408

34,510

Metric Fastener Strengths

 

Class 4.6

Class 5.8

Class 8.8

Class 9.8

Class 10.9

Nominal
Diameter
mm

Stress
Area
(mm2)

Proof
Load
KN

Ultimate
Load
Min. KN

Proof
Load
KN

Ultimate
Load
Min. KN

Proof
Load
KN

Ultimate
Load
Min. KN

Proof
Load
KN

Ultimate
Load
Min. KN

Proof
Load
KN

Ultimate
Load
Min. KN

M1.6 x 0.35

1.27

0.28575

0.508

0.4826

0.6604

0.762

1.016

0.8255

1.143

1.0541

1.3208

M2 x 0.4

2.07

0.46575

0.828

0.7866

1.0764

1.242

1.656

1.3455

1.863

1.7181

2.1528

M2.5x0.45

3.39

0.76275

1.356

1.2882

1.7628

2.034

2.712

2.2035

3.051

2.8137

3.5256

M3 x 0.5

5.03

1.13

2.01

1.91

2.62

2.92

4.02

3.27

4.53

4.18

5.23

M3.5 x 0.6

6.78

1.53

2.71

2.58

3.53

3.94

5.42

4.41

6.1

5.63

7.05

M4 x 0.7

8.78

1.98

3.51

3.34

4.57

5.1

7.02

5.71

7.9

7.29

9.13

M5 x 0.8

14.2

3.2

5.68

5.4

7.38

8.23

11.35

9.23

12.8

11.8

14.8

M6 x 1

20.1

4.52

8.04

7.64

10.4

11.6

16.1

13.1

18.1

16.7

20.9

M7

28.9

6.5

11.6

11

15

16.8

23.1

18.8

26

24

30.1

M8 x 1.25

36.6

8.24

14.6

13.9

19

21.2

29.2

23.8

32.9

30.4

38.1

M8 x 1

39.2

8.82

15.7

14.9

20.4

22.7

31.36

25.5

35.3

32.5

40.8

M10 x 1.5

58.0

13

23.2

22

30.2

33.7

46.4

37.7

52.2

48.1

60.3

M10 x 1

64.5

14.5

25.8

24.5

33.5

37.4

51.6

41.9

58.1

53.5

67.1

M12 x 1.5

88.1

19.8

35.2

33.5

45.8

51.1

70.5

57.3

79.3

73.1

91.6

M14 x 1.5

125

28.1

50

47.5

65

72.5

100

81.2

112

104

130

M16 x 2

157

35.3

62.8

59.7

81.6

91

125

102

141

130

163

M16 x 1.5

167

37.6

66.8

63.5

86.8

96.9

134

109

150

139

174

M18

192

43.2

76.8

73

99.8

115

159

124.8

172.8

159

200

M18 x 1.5

216

48.6

86.4

82.1

112

130

179

140.4

194.4

179

225