@@攻牙底孔参数-2

攻牙底孔的使用参数表

一、螺紋下孔徑表

1、公制粗牙螺紋JIS B 0209-1982(單位：mm)

螺纹尺寸钻头直径螺纹下孔徑內螺紋小徑

最小直径最大直径

M1×0.25 0.75 0.78 (80%) 0.729 0.785

1.1 ×0.25 0.85 0.88 (80%) 0.829 0.885

1.2 ×0.25 0.95 0.98 (80%) 0.929 0.985

1.4 ×0.3 1.1 1.14 (80%) 1.075 1.142

1.6 ×0.35 1.25 1.32 (75%) 1.221 1.321

1.8 ×0.35 1.45 1.52 (75%) 1.421 1.521

2×0.4 1.6 1.65 (80%) 1.567 1.679

2.2 ×0.45 1.75 1.83 (75%) 1.713 1.838

2.5 ×0.45 2.1 2.13 (75%) 2.013 2.138

3×0.5 2.5 2.59 (75%) 2.459 2.599

3.5 ×0.6 2.9 3.01 (75%) 2.850 3.010

4×0.7 3.3 3.39 (80%) 3.242 3.422

4.5 ×0.75 3.8 3.85 (80%) 3.688 3.878

5×0.8 4.2 4.31 (80%) 4.134 4.334

6×1 5 5.13 (80%) 4.917 5.153

7×1 6 6.13 (80%) 5.917 6.153

8×1.25 6.8 6.85 (85%) 6.647 6.912

9×1.25 7.8 7.85 (85%) 7.647 7.912

10×1.5 8.5 8.62 (85%) 8.376 8.676

11×1.5 9.5 9.62 (85%) 9.376 9.676

12×1.75 10.3 10.40 (85%) 10.106 10.441

14×2 12 12.2 (85%) 11.835 12.210

16×2 14 14.2 (85%) 13.835 14.210

18×2.5 15.5 15.7 (85%) 15.294 15.744

20×2.5 17.5 17.7 (85%) 17.294 17.744

22×2.5 19.5 19.2 (85%) 19.294 19.744

24×3 21 21.2 (85%) 20.752 21.252

27×3 24 24.2 (85%) 23.752 24.252

30×3.5 26.5 26.6 (90%) 26.211 26.771

33×3.5 29.5 29.6 (90%) 29.211 29.771

36×4 32 32.1 (90%) 31.670 32.270

39 ×4 35 35.1 (90%) 34.670 35.270

42 ×4.5 37.5 37.6 (90%) 37.129 37.799

45 ×4.5 40.5 40.6 (90%) 40.129 40.799

48 ×5 43 43.1 (90%) 42.587 43.297

註(1)M1.4以下等級：5H、M1.6以上等級：6H (2)基於JIS B 0209-1982標準

2、公制細牙螺紋-01JIS B 0211-1982(單位：mm)

螺纹尺寸钻头直径螺纹下孔徑內螺紋小徑

最小直径最大直径M2.5 ×0.35 2.2 2.22 (75%) 2.121 2.221 3×0.35 2.7 2.72 (75%) 2.621 2.721 3.5 ×0.35 3.2 3.22 (75%) 3.121 3.221 4×0.5 3.5 3.59 (75%) 3.459 3.599 4.5 ×0.5 4 4.09 (75%) 3.959 4.099 5×0.5 4.5 4.59 (75%) 4.459 4.599 5.5 ×0.5 5 5.09 (75%) 4.959 5.099 6×0.75 5.3 5.35 (80%) 5.188 5.378 7×0.75 6.3 6.35 (80%) 6.188 6.378 8×1 7 7.13 (80%) 6.917 7.153 8×0.75 7.3 7.35 (80%) 7.188 7.378 9×1 8 8.13 (80%) 7.917 8.153 9×0.75 8.3 8.35 (80%) 8.188 8.378 10×1.25 8.8 8.85 (85%) 8.647 8.912 10×1 9 9.13 (80%) 8.917 9.153 10×0.75 9.3 9.35 (80%) 9.188 9.378 11 ×1 10 10.13 (80%) 9.917 10.153

11 ×0.75 10.3 10.35 (80%) 10.188 10.378

12 ×1.5 10.5 10.62 (85%) 10.376 10.676 12 ×1.25 10.8 10.85 (85%) 10.647 10.912 12 ×1 11 11.13 (80%) 10.917 11.153 14 ×1.5 12.5 12.62 (85%) 12.376 12.676

14 ×1 13 13.13 (80%) 12.917 13.153

15 ×1.5 13.5 13.62 (85%) 13.376 13.676

15 ×1 14 14.13 (80%) 13.917 14.153

16 ×1.5 14.5 14.62 (85%) 14.376 14.676

16 ×1 15 15.13 (80%) 14.917 15.153

17 ×1.5 15.5 15.62 (85%) 15.376 15.676

17 ×1 16 16.13 (80%) 15.917 16.153

18 ×2 16 16.2 (85%) 15.835 16.210 18 ×1.5 16.5 16.62 (85%) 16.376 16.676 18 ×1 17 17.13 (80%) 16.917 17.153 20 ×2 18 18.2 (85%) 17.835 18.210 20 ×1.5 18.5 18.62 (85%) 18.376 18.676 20 ×1 19 19.13 (80%) 18.917 19.153 22 ×2 20 20.2 (85%) 19.835 20.210 22 ×1.5 20.5 20.62 (85%) 20.376 20.676 22 ×1 21 21.13 (80%) 20.917 21.153 24 ×2 22 22.2 (85%) 21.835 22.210 24 ×1.5 22.5 22.62 (85%) 22.376 22.676

24 ×1 23 23.13 (80%) 22.917 23.153

25 ×2 23 23.2 (85%) 22.835 23.210 25 ×1.5 23.5 23.62 (85%) 23.376 23.676

25 ×1 24 24.13 (80%) 23.917 24.153

公制細牙螺紋-02JIS B 0211-1982(單位：mm)螺纹尺寸钻头直径螺纹下孔徑內螺紋小徑

最小直径最大直径

M26×1.524.5 24.62 (85%) 24.376 24.676

27 ×2 25 25.2(85%) 24.835 25.210

27 ×1.5 25.5 25.62 (85%) 25.376 25.676

27 ×1 26 26.13 (80%) 25.917 26.153

28 ×2 26 26.2(85%) 25.835 26.210

28 ×1.5 26.5 26.62 (85%) 26.376 26.676

28 ×1 27 27.13 (80%) 26.917 27.153

30 ×3 27 27.2 (85%) 26.752 27.252

30 ×2 28 28.2 (85%) 27.835 28.210

30 ×1.5 28.5 28.62 (85%) 28.376 28.676

30 ×1 29 29.13 (80%) 28.917 29.153

32 ×2 30 30.2 (85%) 29.835 30.210

32 ×1.5 30.5 30.62 (85%) 30.376 30.676

33 ×3 30 30.2 (85%) 29.752 30.252

33 ×2 31 31.2 (85%) 30.835 31.210

33 ×1.5 31.5 31.62 (85%) 31.376 31.676

35 ×1.5 33.5 33.62 (85%) 33.376 33.676

36 ×3 33 33.2 (85%) 32.752 33.252

36 ×2 34 34.2 (85%) 33.835 34.210

36 ×1.5 34.5 34.62 (85%) 34.376 34.676

38 ×1.5 36.5 36.62 (85%) 36.376 36.676

39 ×3 36 36.2 (85%) 35.752 36.252

39 ×2 37 37.2 (85%) 36.835 37.210

39 ×1.5 37.5 37.62 (85%) 37.376 37.676

40 ×3 37 37.2 (85%) 36.752 37.252

40 ×2 38 38.2 (85%) 37.835 38.210

40 ×1.5 38.5 38.62 (85%) 38.376 38.676

42 ×4 38 38.1 (90%) 37.670 38.270

42 ×3 39 39.2 (85%) 38.752 39.252

42 ×2 40 40.2 (85%) 39.835 40.210

42 ×1.5 40.5 40.62 (85%) 40.376 40.676

45 ×4 41 41.1 (90%) 40.670 41.270

45 ×3 42 42.2 (85%) 41.752 42.252

45 ×2 43 43.2 (85%) 42.835 43.210

45 ×1.5 43.5 43.62 (85%) 43.376 43.676

48 ×4 44 44.1 (90%) 43.670 44.270

48 ×3 45 45.2 (85%) 44.752 45.252

48 ×2 46 46.2 (85%) 45.835 46.210

48 ×1.5 46.5 46.62 (85%) 46.376 46.676 50 ×3 47 47.2 (85%) 46.752 47.252 50 ×2 48 48.2 (85%) 47.835 48.210 50 ×1.5 48.5 48.62 (85%) 48.376 48.676 註(1)等級：6H(2)基於JIS B 0211-1982標準

3、美制粗牙螺紋(單位：mm)

螺纹尺寸钻头直

径2B级螺纹下孔徑內螺紋小徑

最小直径最大直径

NO.1 -64UNC 1.55 1.57 (65%) 1.425 1.582

2 -56 1.8 1.86 (65%) 1.695 1.871

3 -48 2.1 2.1

4 (65%) 1.941 2.146

4 -40 2.3 2.36 (70%) 2.157 2.385

5 -40 2.

6 2.69 (70%) 2.48

7 2.697

6 -32 2.8 2.86 (75%) 2.642 2.895

8 -32 3.4 3.52 (75%) 3.302 3.530

10 -24 3.9 3.91 (80%) 3.683 3.962

12 -24 4.5 4.57 (80%) 4.344 4.597

1/4 -20 5.1 5.25 (80%) 4.979 5.257 5/16-18 6.6 6.72 (80%) 6.401 6.731 3/8 -16 8 8.15 (80%) 7.798 8.153 7/16 -14 9.4 9.50 (80%) 9.144 9.550 1/2 -13 10.8 11.0 (80%) 10.592 11.023 9/16 -12 12.2 12.3 (85%) 11.989 12.446 5/8-11 13.6 13.8 (85%) 13.386 13.868 3/4-10 16.5 16.8 (80%) 16.307 16.840 7/8-9 19.5 19.6 (85%) 19.177 19.761 1 -8 22.2 22.5 (85%) 21.971 22.606

11/8 -7 25 25.2 (85%) 24.638 25.349 11/4 -7 28.2 28.4 (85%) 27.813 28.524 13/8 -6 30.8 31.0 (85%) 30.353 31.115 11/2 -6 34 34.2 (85%) 33.528 34.290 13/4 -5 39.5 39.8 (85%) 38.964 39.827

2 - 4 45.2 45.

3 (90%) 44.679 45.593 4、美制細牙螺紋(單位：mm)

螺纹尺寸钻头

直径2B级螺纹下孔徑內螺紋小徑

最小直径最大直径

NO.0-80UNF 1.25 1.30 (65%) 1.182 1.305

1 -7

2 1.55 1.61 (65%) 1.474 1.612

2 -64 1.85 1.90 (65%) 1.756 1.912

3 -56 2.1 2.17 (70%) 2.025 2.197

4 -48 2.4 2.44 (70%) 2.271 2.458

5 -44 2.7 2.74 (70%) 2.551 2.740

6 -40 2.9 3.02 (70%) 2.820 3.022

8 -36 3.5 3.59 (75%) 3.404 3.606

10 -32 4.1 4.14 (80%) 3.963 4.165

12 -28 4.6 4.70 (80%) 4.496 4.724

1/4 -28 5.5 5.56 (80%) 5.360 5.588

5/16-24 6.9 7.02 (80%) 6.782 7.035

3/8 -24 8.5 8.61 (80%) 8.382 8.636

7/16-20 9.9 10.01 (80%) 9.729 10.033

1/2 -20 11.5 11.60 (80%) 11.329 11.607

9/16 -18 12.9 13.07 (80%) 12.751 13.081

5/8 -18 14.5 14.65 (80%) 14.351 14.681

3/4 -16 17.5 17.59 (85%) 17.323 17.678

7/8 -14 20.5 20.6(85%) 20.270 20.675

1-12 23.2 23.5(85%) 23.114 23.571

1 1/8 -1

2 26.5 26.7(80%) 26.289 26.746

1 1/4 -1

2 29.5 29.9(80%) 29.464 29.921

1 3/8 -1

2 32.8 33.0(85%) 32.639 33.096

1 1/

2 -12 36 36.2(85%) 35.814 36.271 5、英制粗牙螺紋(單位：mm)

螺紋尺寸下孔徑嵌合率

A列(硬材

質) B列(軟材

質)

A列直徑B列直徑內螺紋最

小徑

內螺紋最

大徑

W 1/8 2.6 2.5 70.7 83.0 70.0 88.3 3/16 3.7 3.6 78.4 85.8 70.0 88.3 1/4 5.1 5.0 76.9 83.0 70.5 88.3 5/16 6.6 6.5 74.0 99.5 70.1 88.4 3/8 8.0 7.9 75.0 80.0 69.5 88.2 7/16 9.4 9.3 73.7 80.0 69.0 88.8 1/2 10.7 10.5 73.8 81.2 69.0 88.2 9/16 12.3 12.0 73.4 84.4 69.0 88.2 5/8 13.7 13.5 73.5 80.3 69.6 88.5 3/4 16.7 16.5 72.3 78.4 69.6 88.3 7/8 19.5 19.3 75.4 80.9 70.1 88.4 1 22.4 22.0 73.8 83.6 71.0 88.2 1 1/8 25.0 24.8 76.9 81.3 72.0 88.4 1 1/4 28.3 28.0 74.3 80.7 72.0 88.4 1 3/8 30.5 30.3 81.6 85.3 73.8 88.6 1 1/2 33.8 33.5 79.3 84.8 73.8 88.6 1 5/8 36.0 35.7 81.1 85.7 74.8 88.3 1 3/4 39.2 39.0 80.7 83.8 74.8 88.3

1 7/8 41.8 41.5 80.6 84.7 74.7 88.4

2 45.0 44.7 80.2 84.4 74.7 88.4 6、英制管用螺紋(單位：mm)

管用螺紋尺寸

JIS B 0203JIS B 2301

錐管內螺紋Rc(PT) 平行內螺紋Rp(PS) 錐管內螺紋

計算

值

下孔徑計算值下孔徑計算值下孔

徑

1/16 6.230 6.2 6.490 6.5 －－1/8 8.235 8.2 8.495 8.5 8.191 8.2 1/4 10.941 10.9 11.341 11.4 10.945 10.9 3/8 14.428 14.4 14.846 14.9 14.388 14.4 1/2 17.950 18 18.489 18.5 17.943 18 3/4 23.349 23 23.975 24 23.305 23 1 29.423 29 30.111 30 29.353 29 1 1/4 37.940 38 38.772 39 37.890 38

1 1/

2 43.83

3 4

4 44.56

5 45 43.720 43

2 55.412 55 56.476 56 55.406 55

2 1/2 70.701 71 72.009 72 70.788 70

3 83.201 83 84.709 85 83.36

4 83

3 1/2 95.547 96 97.155 97 95.747 95

4 107.834 108 109.85

5 110 108.322 108

5 133.110 133 135.255 135 133.597 133

6 158.510 159 160.655 161 158.810 158

7 183.360 183 185.954 186

8 208.560 209 211.354 212

9 233.960 234 236.754 237

10 259.166 259 262.154 262

12 309.747 310 312.875 313

7、美制管用耐密斜行螺紋(NPTF?NPSF) (單位：mm)

管用螺紋尺寸斜行螺紋(NPTF)平行螺紋(NPSF)

鑽頭直徑鑽頭直徑

使用鉸刀場合不使用鉸刀

場合

1/16 －0.234 ( 5.94) 0.246 ( 6.25) 1/4 0.250 ( 6.35)

1/8 21/64 0.328 ( 8.33) 0.339 ( 8.61) 11/32 0.344 ( 8.74)

1/4 27/64 0.422 (10.72) 7/16 0.438 (11.13) －0.444 (11.28)

3/8 9/16 0.562 (14.27) 37/64 0.578 (14.68) 37/64 0.578 (14.68)

1/2 11/16 0.688 (17.48) 45/64 0.703 (17.86) 23/32 0.719 (18.26)

3/4 57/64 0.891 (22.63) 59/64 0.922 (23.42) －0.922 (23.42)

1 1 1/8 1.125 (28.58) 1

5/32

1.156 (29.36) 1 5/32 1.156 (29.36)

1 1/4 1 15/3

2 1.469 (37.31) 1

1/2

1.500 (38.10) －－

1 1/

2 1 45/64 1.70

3 (43.26) 1

47/64

1.734 (44.04) －－

2 2 3/16 2.188 (55.58) 2

7/32

2.219 (56.36) －－

2 1/2 2 19/32 2.594 (65.89) 2

41/64

2.641 (67.08) －－

上述鑽頭直徑來源於美制管用耐密斜行螺紋ANSI B1.20.3—1957 Dryseal Pipe Threads (Inch)標準8、公制螺紋(NRT) (單位：mm)

螺紋尺寸1級螺紋用下孔徑2級螺紋用下孔徑

RH 精度最小～最大

(嵌合率％)

RH

精度

最小～最大

(嵌合率％)

M 1×0.25 2 0.87 ~ 0.89(100~85) 4 0.90 ~0.92 (100~80) 1.1×0.25 2 0.97 ~ 0.99(100~85) 4 1.00 ~1.02 (100~80) 1.2×0.25 2 1.07 ~ 1.09(100~85) 4 1.10 ~1.12 (100~80) 1.4×0.3 2 1.244~ 1.263

(100~85)

4 1.270~1.294 (100~80)

1.7×0.35 2 1.51 ~ 1.54(100~80) 4 1.54 ~ 1.58 (100~75)

2 ×0.4 2 1.78 ~ 1.82(100~80) 4 1.81 ~ 1.85 (100~75) 2.3×0.4 2 2.08 ~ 2.12(100~80) 4 2.11 ~ 2.15 (100~75) 2.5×0.45 2 2.25 ~ 2.29(100~80) 4 2.28 ~ 2.3

3 (100~75)

2.6×0.45 2 2.35 ~ 2.39(100~80) 4 2.38 ~ 2.43 (100~75)

3 ×0.5 3 2.7

4 ~ 2.78(100~80)

5 2.7

6 ~ 2.81 (100~75)

3.5×0.6 3 3.18 ~ 3.21(100~85) 5 3.20 ~ 3.26 (100~75)

4 ×0.7 4 3.63 ~ 3.67(100~85) 6 3.6

5 ~ 3.70 (100~85)

5 ×0.8 4 4.57 ~ 4.62(100~85)

6 4.59 ~ 4.66 (100~80)

6 ×1 4 5.45 ~ 5.51(100~85)

7 5.4

8 ~ 5.57 (100~80)

7 ×1 4 6.45 ~ 6.51(100~85) 7 6.48 ~ 6.57 (100~80)

8 ×1.25 5 7.31 ~ 7.38(100~85) 7 7.34 ~ 7.41 (100~85) 8 ×1 4 7.45 ~ 7.51(100~85) 7 7.48 ~ 7.57 (100~80) 10 ×1.5 5 9.16 ~ 9.22(100~90) 7 9.18 ~ 9.28 (100~85) 10 ×1.25 5 9.31 ~ 9.38(100~85) 7 9.34 ~ 9.41 (100~85) 10 ×1 5 9.46 ~ 9.52(100~85) 7 9.48 ~ 9.57 (100~80)

12 ×1.75 5 11.01 ~11.08

(100~90) 8 11.05 ~11.15

(100~85)

12 ×1.5 5 11.16 ~11.22

(100~90) 7 11.18 ~11.28

(100~85)

12 ×1.25 5 11.31 ~11.38

(100~85) 7 11.34 ~11.41

(100~85)

12 ×1 5 11.46 ~11.52

(100~85) 7 11.48 ~11.57

(100~80)

14 ×2 6 12.83 ~12.95

(100~90) 10 12.92 ~13.04

(100~85)

14 ×1.5 5 13.16 ~13.22

(100~90) 9 13.21 ~13.30

(100~85)

16 ×2 6 14.87 ~14.95

(100~90) 10 14.92 ~15.04

(100~85)

16 ×1.5 5 15.16 ~15.22

(100~90) 9 15.21 ~15.30

(100~80)

18 ×2.5 6 16.57 ~16.67

(100~90) 11 16.63 ~16.78

(100~85)

18 ×1.5 6 17.17 ~17.23

(100~90) 10 17.22 ~17.31

(100~85)

20 ×2.5 6 18.57 ~18.67

(100~90) 11 18.63 ~18.78

(100~85)

20 ×1.5 6 19.17 ~19.23 10 19.22 ~19.31

(100~90) (100~85) 9、美制粗牙螺紋(NRT) (單位：mm)

螺紋尺寸2B級螺紋用下孔徑3B級螺紋用下孔徑

RH 精度最小～最大

(嵌合率％)

RH

精度

最小～最大

(嵌合率％)

NO.2-

56UNC 4 1.96 ~ 2.02 (100~65) 3 1.95 ~ 2.01 (100~65) 3-48 4 2.25 ~ 2.32 (100~65) 3 2.23 ~ 2.31 (100~65) 4-40 5 2.52 ~ 2.60 (100~70) 3 2.50 ~ 2.58 (100~70) 5-40 5 2.86 ~ 2.93 (100~70) 3 2.83 ~ 2.91 (100~70) 6-32 5 3.09 ~ 3.17 (100~75) 3 3.06 ~ 3.14 (100~75) 8-32 6 3.75 ~ 3.83 (100~75) 4 3.74 ~ 3.82 (100~75) 10-24 6 4.26 ~ 4.35 (100~80) 4 4.24 ~ 4.32 (100~80) 12-24 6 4.92 ~ 5.01 (100~80) 4 4.90 ~ 4.96 (100~85) 1/4 -20 6 5.66 ~ 5.76 (100~80) 4 5.64 ~ 5.74 (100~80) 5/16 -18 7 7.18 ~7.29 (100~80) 5 7.15 ~7.24 (100~85) 3/8 -16 7 8.66 ~8.78 (100~80) 5 8.63 ~8.73 (100~85)

7/16 -14 7 10.11 ~10.25

(100~80) 5 10.08 ~10.19 (100~85)

1/2 -13 8 10.62 ~11.78

(100~80) 6 11.60 ~11.68 (100~90)

9/16 -12 10 13.14 ~13.27

(100~85) 8 13.11 ~13.24 (100~85)

5/8 -11 11 14.62 ~14.76

(100~85) 8 14.58 ~14.67 (100~90)

3/4 -10 12 17.67 ~17.88

(100~80) 9 17.63 ~17.74 (100~90)

7/8 - 9 12 20.68 ~20.85

(100~85) 9 20.64 ~20.75 (100~90)

1 - 8 13 23.65 ~23.84

(100~85) 10 23.61 ~23.74 (100~90)

二、螺紋下孔徑表(無屑絲攻用)

1、美制細牙螺紋(NRT) (單位：mm)

螺紋尺寸2B級螺紋用下孔徑3B級螺紋用下孔徑

RH 精度最小～最大

(嵌合率％)

RH

精度

最小～最大

(嵌合率％)

NO.2-64UNF 3 1.98 ~ 2.04 (100~65) 2 1.97 ~ 2.03 (100~65) 3-56 4 2.29 ~ 2.35 (100~65) 3 2.28 ~ 2.34 (100~65) 4-48 4 2.57 ~ 2.64 (100~70) 3 2.56 ~ 2.63 (100~70) 5-44 4 2.88 ~ 2.95 (100~70) 3 2.87 ~ 2.94 (100~70) 6-40 5 3.19 ~ 3.26 (100~70) 3 3.16 ~ 3.22 (100~75) 8-36 5 3.80 ~ 3.88 (100~75) 4 3.79 ~ 3.86 (100~75) 10-32 5 4.41 ~ 4.48 (100~80) 4 4.40 ~ 4.46 (100~80) 12-28 5 5.00 ~ 5.08 (100~80) 4 4.99 ~ 5.06 (100~80) 1/4-28 5 5.86 ~ 5.93 (100~80) 4 5.85 ~ 5.92 (100~80)

5/16-24 6 7.38 ~7.46 (100~80) 5 7.36 ~7.43 (100~85) 3/8 -24 6 8.96 ~9.05 (100~80) 5 8.95 ~9.02 (100~85) 7/16-20 7 10.44 ~10.54 (100~80) 5 10.41 ~10.49 (100~85) 1/2-20 7 12.02 ~12.12 (100~80) 5 12.00 ~12.05 (100~90) 9/16-18 9 13.55 ~13.66 (100~80) 7 13.53 ~13.58 (100~90) 5/8 -18 9 15.14 ~15.25 (100~80) 7 15.11 ~15.17 (100~90) 3/4 -16 10 18.22 ~18.32 (100~85) 7 18.18 ~18.25 (100~90) 7/8 -14 11 21.27 ~21.38 (100~85) 8 21.23 ~21.27 (100~95)

1 - 1

2 12 24.28 ~24.41 (100~85) 9 24.24 ~24.32 (100~90)

2、英制管用平行螺紋(NRT) (單位：mm)

螺紋尺寸RH精度最小～最大(嵌合率％)

PF 1/8 6 9.24~9.35 (100~80)

1/4 7 12.41~12.62 (100~75)

3/8 7 15.92~16.12 (100~75)

1/2 8 19.93~20.15 (100~80)

3/4 8 25.41~25.64 (100~80)

3、公制螺紋(HRT) (單位：mm)

螺紋尺寸1級螺紋用下孔徑2級螺紋用下孔徑

RH 精度最小～最大

(嵌合率％)

RH

精度

最小～最大

(嵌合率％)

M 1×0.25 2 0.858~0.879

(100~85)

4 0.858~0.887 (100~80)

1.2×0.25 2 1.058~1.079

(100~85)

4 1.058~1.087 (100~80) 1.4×0.3 2 1.23 ~1.26 (100~85) 4 1.23 ~1.26 (100~80) 1.6×0.3

5 2 1.40 ~1.44 (100~80) 4 1.40 ~1.45 (100~75) 1.7×0.35 － 1.50 ~1.54 (100~80) 4 1.50 ~1.55 (100~75)

1.8×0.35 2 1.60 ~1.64 (100~80) 4 1.60 ~1.65 (100~75)

2 ×0.4 2 1.77 ~1.82 (100~80) 4 1.77 ~1.82 (100~80) 2 ×0.25 2 1.858~1.887

(100~80)

－ 1.858~1.887 (100~80) 2.3×0.4 － 2.07 ~2.12 (100~80) 4 2.07 ~2.13 (100~75) 2.5×0.45 3 2.24 ~2.30 (100~80) 5 2.24 ~2.31 (100~75)

2.6×0.45 － 2.34 ~2.40 (100~80) 5 2.34 ~2.41 (100~75)

3 ×0.6 3 2.72 ~2.73 (100~90) 5 2.66 ~2.73 (100~90) 3 ×0.5 5 2.72 ~2.77 (100~80) 6 2.72 ~2.78 (100~75) 3 ×0.35 3 2.80 ~2.8

4 (100~80)

5 2.80 ~2.85 (100~75)

3.5×0.6 3 3.16 ~3.21 (100~85) 5 3.16 ~3.25 (100~75)

4 ×0.7

5 3 3.57 ~3.64 (100~85)

6 3.5

7 ~3.64 (100~85) 4 ×0.7 6 3.60 ~3.66 (100~85) 7 3.60 ~3.66 (100~85)

4 ×0.

5 3 3.71 ~3.77 (100~80)

6 3.71 ~3.79 (100~75)

5 ×0.9 3 4.49 ~4.59 (100~85) 7 4.49 ~4.59 (100~85) 5 ×0.8 3 4.55 ~4.62 (100~85) 8 4.55 ~4.64 (100~80)

5 ×0.5 3 2.72 ~4.77 (100~80)

6 4.72 ~4.79 (100~75)

6 ×1 4 5.43 ~5.52 (100~85)

7 5.43 ~5.55 (100~80) 6 ×0.75 3 5.57 ~5.64 (100~85) 7 5.57 ~5.66 (100~80)

4、公制粗牙螺紋HL-NRT (單位：mm)

螺紋尺寸RH精度最小～最大(嵌合率％) M 3 ×0.5 3 3.39~3.43 (100~80)

4 ×0.7 4 4.54~4.58 (100~85)

5 ×0.8 4 5.61~5.6

6 (100~85)

6 ×1 4 6.75~6.81 (100~85) 8 ×1.25 5 8.93~9.01 (100~85) 10 ×1.5 5 11.11~11.1

7 (100~90) 10 ×1.25 5 10.93~11.01 (100~85) 12 ×1.75 5 13.28~13.17 (100~90) 12 ×1.5 5 13.11~13.17 (100~90)

12 ×1.25 5 12.93~13.01 (100~85)

三、螺紋下孔徑表(護套螺紋用)

1、公制粗牙螺紋(單位：mm)

螺紋尺寸下孔徑鑽頭直徑

最小直徑最大直徑

M 2.5×0.45 2.60 2.65 2.6

2.6×0.45 2.70 2.75 2.7

3 ×0.5 3.12 3.20 3.1

4 ×0.7 4.17 4.30 4.2

5 ×0.8 5.1

6 5.33 5.2

6 ×1 6.25 6.42 6.3 8 ×1.25 8.31 8.52 8.4 10 ×1.5 10.3

7 10.62 10.5 12 ×1.75 12.43 12.73 12.5 14 ×2 14.49 14.83 14.5 16 ×2 16.49 16.83 16.5 1

8 ×2.5 18.58 19.04 19.0 20 ×2.5 20.58 21.04 21.0 22 ×2.5 22.58 23.04 23.0 24 ×2.5 24.70 25.25 25.0 2、公制細牙螺紋(單位：mm)

螺紋尺寸下孔徑鑽頭直徑

最小直徑最大直徑

M 10 ×1 10.25 10.42 10.3

10 ×1.25 10.31 10.52 10.4

12 ×1.25 12.31 12.52 12.5

12 ×1.5 12.37 12.62 12.5

14 ×1.5 14.37 14.62 14.5

16 ×1.5 16.37 16.62 16.5

18 ×1.5 18.37 18.62 18.5

20 ×1.5 20.37 20.62 20.5

20 ×2 20.47 20.83 20.5

22 ×1.5 22.37 22.62 22.5

24 ×1.5 24.37 24.62 24.5

24 ×2 24.47 24.83 24.5

30 ×1.5 30.37 30.62 30.5

3、美制粗牙螺紋(單位：mm)

螺紋尺寸下孔徑鑽頭直徑

最小直徑最大直徑

NO. 2 –56UNC 2.29 2.39 2.3

3 –48 2.6

4 2.74 2.7

4 –40 2.9

5 3.07 3.0

5 –40 3.25 3.38 3.3

6 –32 3.66 3.81 3.7

8 –32 4.32 4.47 4.4

10 –24 5.05 5.21 5.1

12 –24 5.61 5.77 5.7

1/4 –20 6.63 6.78 6.7

5/16 –8 8.33 8.48 8.4

3/8 –16 9.91 10.11 10.0

7/16–14 11.51 11.76 11.5

1/2 –13 13.08 13.34 13.1

9/16–12 14.68 14.94 14.7 4、美制細牙螺紋(單位：mm)

螺紋尺寸下孔徑鑽頭直徑

最小直徑最大直徑

NO. 4 –48UNF 2.97 3.05 3.0

6 –40 3.66 3.78 3.7

8 –36 4.32 4.44 4.4

10 –32 4.98 5.13 5.0

1/4 –28 6.53 6.71 6.6 5/16 –24 8.20 8.38 8.2

3/8 –24 9.78 9.96 9.8 7/16 –20 11.43 11.63 11.5

1/2 –20 13.03 13.26 13.1 9/16 –18 14.66 14.88 14.7

5/8 –18 16.26 16.48 16.3

3/4 –16 19.43 19.68 19.5

7/8 –14 22.61 22.86 22.7

1 –1

2 25.76 26.04 26.0

各種換算表

管用螺絲基準寸法(mm)

規格英制JIS(PT)美式ASA(NPT)

山數外徑有效徑山數外徑有效徑1/167.723277.777.142 1/8289.7289.1472710.1169.489 1/41913.15712.3011813.42712.487 3/81916.66215.8061816.86615.926 1/21420.95519.7931420.98019.772 3/41426.44125.2791426.32625.117 11133.24931.770111/233.93231.461 11/41141.91040.431111/241.68940.218 11/21147.80346.324111/247.68946.287 21159.61458.135111/259.79658.325 21/21175.18473.705872.27370.159 31187.88486.405888.18286.068 31/211100.33098.8518100.69198.776 411113.030111.5518113.548111.433 41/211125.730124.251

511138.430136.9518141.3138.412 51/211151.130149.651

611163.830162.3518168.3165.252 711189.230187.751

811214.630213.1518219.1215.901美制螺絲外徑公厘(mm)換算表

規格吋mm

NO.00.0600 1.524

10.0730 1.854

20.0860 2.184

30.0990 2.515

40.1120 2.845

50.1250 3.175

60.1380 3.505

80.1640 4.166

100.1900 4.826

120.2160 5.486

山數節距換算表

山數(每25.4mm) 節距mm

100 0.2540 80 0.3175 72 0.3528 64 0.3969

60 0.4233 56 0.4536 48 0.5292 44 0.5773 40 0.6350 36 0.7056 32 0.7938 28 0.9071 24 1.0583 20 1.2700 18 1.4111 16 1.5875 14 1.8143 13 1.9538 12 2.1167 11 2.3091 10 2.5400

9 2.8222

8 3.1750

7 3.6286

6 4.2333

5 5.0800 4 1/2 5.6444

4 6.3500 3 1/2 7.2571 3 1/4 7.8154

3 8.4667 2 7/8 8.8348 2 3/

4 9.2364 2 5/8 9.6762 2 1/2 10.1600