UNC/UNF Tables

 

Unified UNF Screw Threads ANSI B1.1

Diameter

Threads Per Inch (TPI)

Major diameter (In)

 

Major diameter

(mm)

 

Pitch Diameter

(mm)

Tap Drill Size(mm)

 

N° 0

80

0.060

1.524

0.317

1.25

N° 1

72

0.073

1.854

0.353

1.55

N° 2

64

0.086

2.184

0.397

1.90

N° 3

56

0.099

2.515

0.453

2.15

N° 4

48

0.112

2.845

0.529

2.40

N° 5

44

0.125

3.175

0.577

2.70

N° 6

40

0.138

3.505

0.635

2.95

N° 8

36

0.164

4.166

0.705

3.50

N° 10

32

0.190

4.826

0.794

4.10

N° 12

28

0.216

5.486

0.907

4.70

1/4”

28

0.250

6.350

0.907

5.50

5/16”

24

0.313

7.938

1.058

6.90

3/8”

24

0.375

9.525

1.058

8.50

7/16”

20

0.438

11.112

1.270

9.90

1/2”

20

0.500

12.700

1.270

11.50

9/16”

18

0.563

14.288

1.411

12.90

5/8”

18

0.625

15.875

1.411

14.50

3/4”

16

0.750

19.050

1.587

17.50

7/8”

14

0.875

22.225

1.814

20.40

1”

12

1.000

25.400

2.117

23.25

1 1/8”

12

1.125

28.575

2.117

26.50

1 1/4”

12

1.250

31.750

2.117

29.50

1 3/8”

12

1.375

34.925

2.117

32.75

1 1/2”

12

1.500

38.100

2.117

36.00

 

UNC threads according ANSI B1.1

Diameter

Threads Per Inch (TPI)

Major diameter (In)

 

Major diameter

(mm)

 

Pitch Diameter

(mm)

Tap Drill Size(mm)

 

N° 1

64

0.073

1.854

0.397

1.50

N° 2

56

0.086

2.184

0.453

1.80

N° 3

48

0.099

2.515

0.529

2.10

N° 4

40

0.112

2.845

0.635

2.35

N° 5

40

0.125

3.175

0.635

2.65

N° 6

32

0.138

3.505

0.794

2.85

N° 8

32

0.164

4.166

0.794

3.50

N° 10

24

0.190

4.826

1.058

4.00

N° 12

24

0.216

5.486

1.058

4.65

1/4”

20

0.250

6.350

1.270

5.35

5/16”

18

0.313

7.938

1.411

6.80

3/8”

16

0.375

9.525

1.587

8.25

7/16”

14

0.438

11.112

1.814

9.65

1/2”

13

0.500

12.700

1.954

11.15

9/16”

12

0.563

14.288

2.117

12.60

5/8”

11

0.625

15.875

2.309

14.05

3/4”

10

0.750

19.050

2.540

17.00

7/8”

9

0.875

22.225

2.822

20.00

1”

8

1.000

25.400

3.175

22.85

1 1/8”

7

1.125

28.575

3.628

25.65

1 1/4”

7

1.250

31.750

3.628

28.85

1 3/8”

6

1.375

34.925

4.233

31.55

1 1/2”

6

1.500

38.100

4.233

34.70

1 3/4”

5

1.750

44.450

5.080

40.40

2”

4 1/2"

2.000

50.800

5.644

46.30

2 1/4"

4 1/2"

2.250

57.150

5.644

52.65

2 1/2"

4

2.500

63.500

6.350

58.50

2 3/4"

4

2.750

69.850

6.350

64.75

3”

4

3.000

76.200

6.350

71.10

3 1/4"

4

3.250

82.550

6.350

77.45

3 1/2"

4

3.500

88.900

6.350

83.80

3 3/4"

4

3.750

95.250

6.350

90.15

4"

4

4.000

101.600

6.350

96.50

 

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