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Bolt Size Chart

Size

Nominal (Major)

Coarse Thread (UNC)

Fine Thread (UNF)

Diameter [in]

Threads Per Inch

Tensile Stress Area [in2]

Minor Area [in2]

Threads Per Inch

Tensile Stress Area [in2]

Minor Area [in2]

#0

0.06

---

---

---

80

0.0018

0.0015

#2

0.086

56

0.0037

0.0031

64

0.0039

0.0034

#4

0.112

40

0.006

0.005

48

0.0066

0.0057

#5

0.125

40

0.008

0.0067

44

0.0083

0.0072

#6

0.138

32

0.0091

0.0075

40

0.0102

0.0087

#8

0.164

32

0.014

0.012

36

0.0147

0.0129

#10

0.19

24

0.0175

0.0145

32

0.02

0.0175

1/4"

0.25

20

0.0318

0.0269

28

0.0364

0.0326

5/16"

0.3125

18

0.0524

0.0454

24

0.058

0.0524

3/8"

0.375

16

0.0775

0.0678

24

0.0878

0.0809

7/16"

0.4375

14

0.1063

0.0933

20

0.1187

0.109

1/2"

0.5

13

0.1419

0.1257

20

0.1599

0.1486

9/16"

0.5625

12

0.182

0.162

18

0.203

0.189

5/8"

0.625

11

0.226

0.202

18

0.256

0.24

3/4"

0.75

10

0.334

0.302

16

0.373

0.351

7/8"

0.875

9

0.462

0.419

14

0.509

0.48

1"

1

8

0.606

0.551

12

0.663

0.625

1-1/8"

1.125

7

0.763

0.693

12

0.856

0.812

1-1/4"

1.25

7

0.969

0.89

12

1.073

1.024

1-3/8"

1.375

6

1.155

1.054

12

1.315

1.26

1-1/2"

1.5

6

1.405

1.294

12

1.581

1.521

1-3/4"

1.75

5

1.9

1.74

---

---

---

2"

2

4.5

2.5

2.3

---

---

---


Metric Bolt Thread Size: 

Thread sizes for coarse and fine pitch thread were created using the standard sizes from ASME B1.13M. Coarse pitch threads are preferred and should be used whenever possible, as stated in ASME B1.13M. 


Nominal (Major)

Diameter [mm]

Coarse Pitch

Fine Pitch

Pitch

[mm]

Tensile Stress

Area [mm2]

Minor

Area [mm2]

Pitch

[mm]

Tensile Stress

Area [mm2]

Minor

Area [mm2]

1.6

0.35

1.27

1.076

---

---

---

2

0.4

2.073

1.789

---

---

---

2.5

0.45

3.391

2.98

---

---

---

3

0.5

5.031

4.473

---

---

---

3.5

0.6

6.775

6

---

---

---

4

0.7

8.779

7.75

---

---

---

5

0.8

14.18

12.68

---

---

---

6

1

20.12

17.89

---

---

---

8

1.25

36.61

32.84

1

39.17

36.03

10

1.5

57.99

52.29

1.25

61.2

56.3

12

1.75

84.27

76.25

1.25

92.07

86.04

14

2

115.4

104.7

1.5

124.5

116.1

16

2

156.7

144.1

1.5

167.2

157.5

20

2.5

244.8

225.2

1.5

271.5

259

24

3

352.5

324.3

2

384.4

364.6

30

3.5

560.6

519

2

621.2

596

36

4

816.7

759.3

2

914.5

883.8

42

4.5

1121

1045

2

1264

1228

48

5

1473

1377

2

1671

1629

56

5.5

2030

1905

2

2301

2252

64

6

2676

2520

2

3031

2975

72

6

3460

3282

2

3862

3799

80

6

4344

4144

1.5

4851

4798

90

6

5591

5364

2

6099

6020

100

6

6995

6740

2

7562

7473

110

---

---

---

2

9182

9084



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