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UNF Screw Thread per ANSI B1.1
Published:2018-08-30 13:11:09    Text Size:【BIG】【MEDIUM】【SMALL

       Sowant Precision Gage Co.,Ltd located in Suzhou city nearby Shanghai ,about 70 kilometers away -a Leader of Chinese Gage Supplier, we can supply traditional gauges such as calipers, micrometers, dial gauges, indicators, height gauges, gauge blocks, API Plug and Ring Gages (API Specification 5B, API Specification 7-2, API Specification 11B, Misc. Connections), Cylindrical Gage, Thread Gage, Air Gage, Spline Gage, Hardness test blocks, Ceramic Gages, but also covers high-technology measuring instruments like hardness tester, vision measuring machine and so on. Our products are mainly manufactured in China according to international standards with calibration report.

     We can supplier the UNF thread gages as your requirement.

SCREW THREAD DATA CHARTS

UNF Thread ANSI B1.1

UNF Screw Thread per ANSI B1.1

UNF = Unified National Fine 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 
Diameter

Major 
Diameter 
Inch

Major 
Diameter 
mm

Tapping Drill 
Size 
mm

TPI

Pitch 
mm

#0 - 80 UNF

0.0600

1.524

1.25

80

0.317

#1 - 72 UNF

0.0730

1.854

1.55

72

0.353

#2 - 64 UNF

0.0860

2.184

1.90

64

0.397

#3 - 56 UNF

0.0990

2.515

2.15

56

0.453

#4 - 48 UNF

0.1120

2.845

2.40

48

0.529

#5 - 44 UNF

0.1250

3.175

2.70

44

0.577

#6 - 40 UNF

0.1380

3.505

2.95

40

0.635

#8 - 36 UNF

0.1640

4.166

3.50

36

0.705

#10 - 32 UNF

0.1900

4.826

4.10

32

0.794

#12 - 28 UNF

0.2160

5.486

4.70

28

0.907

1/4" - 28 UNF

0.2500

6.350

5.50

28

0.907

5/16" - 24 UNF

0.3125

7.938

6.90

24

1.058

3/8" - 24 UNF

0.3750

9.525

8.50

24

1.058

7/16" - 20 UNF

0.4375

11.112

9.90

20

1.270

1/2" - 20 UNF

0.5000

12.700

11.50

20

1.270

9/16" - 18 UNF

0.5625

14.288

12.90

18

1.411

5/8" - 18 UNF

0.6250

15.875

14.50

18

1.411

3/4" - 16 UNF

0.7500

19.050

17.50

16

1.587

7/8" - 14 UNF

0.8750

22.225

20.40

14

1.814

1" - 12 UNF

1.0000

25.400

23.25

12

2.117

1-1/8" - 12 UNF

1.1250

28.575

26.50

12

2.117

1-1/4" - 12 UNF

1.2500

31.750

29.50

12

2.117

1-3/8" - 12 UNF

1.3750

43.925

32.75

12

2.117

1-1/2" - 12 UNF

1.5000

38.100

36.00

12

2.117

UNF Screw Thread

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