NESS ENGINEERING
TECHNICAL DATA
SCREW THREAD MECHANICAL DATA

  Coarse Threads  FineThreads

Coarse Screw Threads
 

Size

Threads / inch

Major Diameter (in.)

Minor Diameter (in.)

Lead Angle (Deg.)

Lead Angle (Min.)

1

64

0.073

0.056

4

31

2

56

0.086

0.067

4

22

3

48

0.099

0.076

4

26

4

40

0.112

0.085

4

45

5

40

0.125

0.098

4

11

6

32

0.138

0.101

4

50

8

32

0.164

0.130

3

58

10

24

0.190

0.145

4

39

12

24

0.216

0.171

4

1

1/4

20

0.250

0.196

4

11

5/16

18

0.313

0.252

3

40

3/8

16

0.375

0.307

3

24

7/16

14

0.438

0.360

3

20

1/2

13

0.5

0.417

3

7

9/16

12

0.563

0.472

2

59

5/8

11

0.625

0.527

2

56

3/4

10

0.750

0.642

2

40

7/8

9

0.875

0.755

2

31

1

8

1.000

0.865

2

29

Fine Screw Threads
 

Size

Threads / inch

Major Diameter (in.)

Minor Diameter (in.)

Lead Angle (Deg.)

Lead Angle (Min.)

0

80

0.060

0.465

4

23

1

72

0.073

0.058

3

57

2

64

0.086

0.069

3

45

3

56

0.099

0.080

3

43

4

48

0.112

0.089

3

51

5

44

0.125

0.100

3

45

6

40

0.138

0.111

3

44

8

36

0.164

0.134

3

28

10

32

0.190

0.156

3

21

12

28

0.216

0.177

3

22

1/4

28

0.250

0.211

2

52

5/16

24

0.313

0.267

2

40

3/8

24

0.375

0.330

2

11

7/16

20

0.438

0.338

2

15

1/2

20

0.5

0.446

1

57

9/16

18

0.563

0.502

1

55

5/8

18

0.625

0.565

1

43

3/4

16

0.750

0.682

1

36

7/8

14

0.875

0.798

1

34

1

12

1.000

0.910

1

36


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Ness Engineering, Inc.
P.O. Box 261501
San Diego, CA 92196
(858) 566-2372
(858) 240-2299 FAX

Richard M. Ness and Ness Engineering, Inc.
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