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Thread code

25.4mm teeth per

Nominal diameter

d

Pitch

p

d1

l

L

Square head

a

l2

7/16-14UNC

14

11.112

1.814

8.20

30.51

76.99

6.15

10.32

1/2-13UNC

13

12.700

1.954

9.32

42.07

79.38

6.99

11.11

9/16-12UNC

12

14.288

2.117

10.90

42.07

91.28

8.18

12.70

5/8-11UNC

11

15.875

2.309

12.19

46.04

96.84

9.14

14.29

3/4-10UNC

10

19.050

2.540

14.99

50.80

107.95

11.23

17.46

7/8-9UNC

9

22.225

2.822

17.70

56.36

119.06

13.28

19.05

1-8UNC

8

25.400

3.175

20.32

63.50

130.18

15.24

20.64

1 1/8-7UNC

7

28.575

3.629

22.76

65.09

138.11

17.07

22.23

1 1/4-7UNC

7

31.750

3.629

25.93

65.09

146.05

19.46

25.40

1 3/8-6UNC

6

34.925

4.233

28.14

76.20

153.99

21.11

26.99

1 1/2-6UNC

6

38.100

4.233

31.31

76.20

161.93

23.50

28.58

1 3/4-5UNC

5

44.450

5.080

36.32

77.79

177.80

27.23

31.75

2-4.5UNC

4.5

50.800

5.644

41.76

80.96

180.98

31.32

34.93

Thread code

25.4mm teeth per

Nominal diameter

d

Pitch

p

d1

l

L

Square head

a

l2

7/16-20UNC

20

11.112

1.270

8.20

30.51

76.99

6.15

10.32

1/2-20UNC

20

12.700

1.270

9.32

42.07

79.38

6.99

11.11

9/16-18UNC

18

14.288

1.411

10.90

42.07

91.28

8.18

12.70

5/8-18UNC

18

15.875

1.411

12.19

46.04

96.84

9.14

14.29

3/4-16UNC

16

19.050

1.588

14.99

50.80

107.95

11.23

17.46

7/8-14UNC

14

22.225

1.814

17.70

56.36

119.06

13.28

19.05

1-12UNC

12

25.400

2.117

20.32

63.50

130.18

15.24

20.64

11/8-12UNC

12

28.575

2.117

22.76

65.09

138.11

17.07

22.23

11/4-12UNC

12

31.750

2.117

25.93

65.09

146.05

19.46

25.40

13/8-12UNC

12

34.925

2.117

28.14

76.20

153.99

21.11

26.99

11/2-12UNC

12

38.100

2.117

31.31

76.20

161.93

23.50

28.58