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NC Screw Thread per ANSI B1.1
Published:2018-08-30 13:06:26    Text Size:【BIG】【MEDIUM】【SMALL
Summary:UNC = Unified National Coarse Screw Thread. This is one of three graded series: UNC (Unified National Corase); UNF (Unified National Fine); and UNEF (Unified National Extra Fine). The Nominal Major Diameter and Threads-per-inch (Pitch) are defined by ANSI/ASME B1.1 and are the choices for the customary Unified screws and nuts.

 SCREW THREAD DATA CHARTS

UNC Screw Thread per ANSI B1.1

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UNC Screw Thread per ANSI B1.1 2003

UNC = Unified National Coarse Screw Thread.
This is one of three graded series: UNC (Unified National Corase); UNF (Unified National Fine); and UNEF (Unified National Extra Fine). The Nominal Major Diameter and Threads-per-inch (Pitch) are defined by ANSI/ASME B1.1 and are the choices for the customary Unified screws and nuts.

Nominal

Major

Major

Tapping

TPI

Pitch

Diameter

Diameter

Diameter

Drill Size

mm

 

Inch

mm

mm

 

#1 - 64 UNC

0.0730

1.854

1.50

64

0.397

#2 - 56 UNC

0.0860

2.184

1.80

56

0.453

#3 - 48 UNC

0.0990

2.515

2.10

48

0.529

#4 - 40 UNC

0.1120

2.845

2.35

40

0.635

#5 - 40 UNC

0.1250

3.175

2.65

40

0.635

#6 - 32 UNC

0.1380

3.505

2.85

32

0.794

#8 - 32 UNC

0.1640

4.166

3.50

32

0.794

#10 - 24 UNC

0.1900

4.826

4.00

24

1.058

#12 - 24 UNC

0.2160

5.486

4.65

24

1.058

1/4" - 20 UNC

0.2500

6.350

5.35

20

1.270

5/16" - 18 UNC

0.3125

7.938

6.80

18

1.411

3/8" - 16 UNC

0.3750

9.525

8.25

16

1.587

7/16" - 14 UNC

0.4375

11.112

9.65

14

1.814

1/2" - 13 UNC

0.5000

12.700

11.15

13

1.954

9/16" - 12 UNC

0.5625

14.288

12.60

12

2.117

5/8" - 11 UNC

0.6250

15.875

14.05

11

2.309

3/4" - 10 UNC

0.7500

19.050

17.00

10

2.540

7/8" - 9 UNC

0.8750

22.225

20.00

9

2.822

1" - 8 UNC

1.0000

25.400

22.85

8

3.175

1-1/8" - 7 UNC

1.1250

28.575

25.65

7

3.628

1-1/4" - 7 UNC

1.2500

31.750

28.85

7

3.628

1-3/8" - 6 UNC

1.3750

43.925

31.55

6

4.233

1-1/2" - 6 UNC

1.5000

38.100

34.70

6

4.233

1-3/4" - 5 UNC

1.7500

44.450

40.40

5

5.080

2" - 4-1/2 UNC

2.0000

50.800

46.30

4.5

5.644

2-1/4" - 4-1/2 UNC

2.2500

57.150

52.65

4.5

5.644

2-1/2" - 4 UNC

2.5000

63.500

58.50

4

6.350

2-3/4" - 4 UNC

2.7500

69.850

64.75

4

6.350

3" - 4 UNC

3.0000

63.500

71.10

4

6.350

3-1/4" - 4 UNC

3.2500

82.550

77.45

4

6.350

3-1/2" - 4 UNC

3.5000

88.900

83.80

4

6.350

3-3/4" - 4 UNC

3.7500

95.250

90.15

4

6.350

4" - 4 UNC

4.0000

101.600

96.50

4

6.350

UNC Screw Thread

    

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