UNEF美制特細螺紋 Unified extra fine thread & constant-pitch series with 8 & with 12 threads

Characteristic

Model : UNEF美制特細螺紋

Unified extra fine thread & constant-pitch series with 8 & with 12 threads

Unified extra fine thread & constant-pitch series with 8 & with 12 threads

 美制特細螺紋和8UN系列及12UN系列螺紋 Unified extra fine thread & constant-pitch series with 8 & with 12 threads

標稱
Nominal size

鉆頭徑
Drill dia

2B級下孔徑
ANSI Class 2B drill hole dia

D1內螺紋內徑
ANSI Class 2B internal thread minor dia

標稱
Nominal size

鉆頭徑
Drill dia

2B級下孔徑
ANSI Class 2B drill hole dia

D1內螺紋內徑
ANSI Class 2B internal thread minor dia

最小尺寸

Min

最大尺寸

Max

最小尺寸

Min

最大尺寸

Max

No.12-32UNEF

4.7

4.7(90%)

4.623

4.826

1 1/4-18 UNEF

30.3

30.4(90%)

30.226

30.556

1/4-32UNEF

5.6

5.6(85%)

5.486

5.690

1 1/4-8 UN

28.5

28.7(90%)

28.321

28.956

5/16-32UNEF

7.1

7.2(85%)

7.087

7.264

1 3/8-18 UNEF

33.5

33.6(85%)

33.401

33.731

3/8-32UNEF

8.7

8.8(85%)

8.651

8.865

1 3/8-8 UN

31.8

31.8(90%)

31.496

32.131

7/16-28UNEF

10.2

10.25(85%)

10.135

10.338

1 1/2-18 UNEF

36.6

36.7(90%)

36.576

36.881

1/2-28UNEF

11.8

11.8(90%)

11.709

11.938

1 1/2-8 UN

35.0

35.0(90%)

34.671

35.306

9/16-24UNEF

13.2

13.3(85%)

13.132

13.386

1 5/8-18 UNEF

39.8

39.9(90%)

39.751

40.081

5/8-24UNEF

14.8

14.9(85%)

14.732

14.986

1 5/8-8 UN

38.2

38.2(90%)

37.846

38.481

3/4-20UNEF

17.8

17.8(90%)

17.678

17.958

1 5/8-12 UN

39.2

39.2(90%)

38.989

39.446

7/8-20UNEF

21.0

21.0(90%)

20.853

21.133

1 3/4-8 UN

41.3

41.3(90%)

41.021

41.656

1-20UNEF

24.1

24.2(85%)

24.028

24.308

1 3/4-12 UN

42.3

41.4(90%)

42.164

42.621

1 1/8-18UNEF

27.2

27.2(90%)

27.051

27.381

2-8 UN

47.8

47.8(85%)

47.371

48.006

1 1/8-8UN

25.5

25.5(90%)

25.146

25.781

2-12 UN

48.6

48.7(90%)

48.514

48.971