频率中位数公式是什么攻牙底孔参数

2020年11月6日发(作者：辛程)
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
M

1

× 0.25
1.1 × 0.25
1.2 × 0.25
1.4 × 0.3
1.6 × 0.35
1.8 × 0.35
2

× 0.4
2.2 × 0.45
2.5 × 0.45
3

× 0.5
3.5 × 0.6
4

× 0.7
4.5 × 0.75
5

× 0.8
6

× 1
7

× 1
8

× 1.25
9

× 1.25
10

× 1.5
11

× 1.5
12

× 1.75
14

× 2
16

× 2
18

× 2.5
20

× 2.5
22

× 2.5
24

× 3
27

× 3
30

× 3.5
33

× 3.5
36

× 4
39 × 4
42 × 4.5
45 × 4.5
48 × 5
钻头直径
0.75
0.85
0.95
1.1
1.25
1.45
1.6
1.75
2.1
2.5
2.9
3.3
3.8
4.2
5
6
6.8
7.8
8.5
9.5
10.3
12
14
15.5
17.5
19.5
21
24
26.5
29.5
32
35
37.5
40.5
43
螺纹下孔徑
0.78 (80%)
0.88 (80%)
0.98 (80%)
1.14 (80%)
1.32 (75%)
1.52 (75%)
1.65 (80%)
1.83 (75%)
2.13 (75%)
2.59 (75%)
3.01 (75%)
3.39 (80%)
3.85 (80%)
4.31 (80%)
5.13 (80%)
6.13 (80%)
6.85 (85%)
7.85 (85%)
8.62 (85%)
9.62 (85%)
10.40 (85%)
12.2 (85%)
14.2 (85%)
15.7 (85%)
17.7 (85%)
19.2 (85%)
21.2 (85%)
24.2 (85%)
26.6 (90%)
29.6 (90%)
32.1 (90%)
35.1 (90%)
37.6 (90%)
40.6 (90%)
43.1 (90%)
內螺紋小徑
最小直径
0.729
0.829
0.929
1.075
1.221
1.421
1.567
1.713
2.013
2.459
2.850
3.242
3.688
4.134
4.917
5.917
6.647
7.647
8.376
9.376
10.106
11.835
13.835
15.294
17.294
19.294
20.752
23.752
26.211
29.211
31.670
34.670
37.129
40.129
42.587

最大直径
0.785
0.885
0.985
1.142
1.321
1.521
1.679
1.838
2.138
2.599
3.010
3.422
3.878
4.334
5.153
6.153
6.912
7.912
8.676
9.676
10.441
12.210
14.210
15.744
17.744
19.744
21.252
24.252
26.771
29.771
32.270
35.270
37.799
40.799
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-01 JIS B 0211-1982(單位：mm)
螺纹尺寸
M

2.5 × 0.35
3

× 0.35
3.5 × 0.35
4

× 0.5
4.5 × 0.5
5

× 0.5
5.5 × 0.5
6

× 0.75
7

× 0.75
8

× 1
8

× 0.75
9

× 1
9

× 0.75
10

× 1.25
10

× 1
10

× 0.75
11

× 1
11

× 0.75
12

× 1.5
12

× 1.25
12

× 1
14

× 1.5
14

× 1
15

× 1.5
15

× 1
16

× 1.5
16

× 1
17

× 1.5
17

× 1
18

× 2
18

× 1.5
18

× 1
20

× 2
20

× 1.5
20

× 1
22

× 2
22

× 1.5
22

× 1
24

× 2
24

× 1.5
24

× 1
25

× 2
25

× 1.5
25

× 1
钻头直径
2.2
2.7
3.2
3.5
4
4.5
5
5.3
6.3
7
7.3
8
8.3
8.8
9
9.3
10
10.3
10.5
10.8
11
12.5
13
13.5
14
14.5
15
15.5
16
16
16.5
17
18
18.5
19
20
20.5
21
22
22.5
23
23
23.5
24
螺纹下孔徑
2.22 (75%)
2.72 (75%)
3.22 (75%)
3.59 (75%)
4.09 (75%)
4.59 (75%)
5.09 (75%)
5.35 (80%)
6.35 (80%)
7.13 (80%)
7.35 (80%)
8.13 (80%)
8.35 (80%)
8.85 (85%)
9.13 (80%)
9.35 (80%)
10.13 (80%)
10.35 (80%)
10.62 (85%)
10.85 (85%)
11.13 (80%)
12.62 (85%)
13.13 (80%)
13.62 (85%)
14.13 (80%)
14.62 (85%)
15.13 (80%)
15.62 (85%)
16.13 (80%)
16.2 (85%)
16.62 (85%)
17.13 (80%)
18.2 (85%)
18.62 (85%)
19.13 (80%)
20.2 (85%)
20.62 (85%)
21.13 (80%)
22.2 (85%)
22.62 (85%)
23.13 (80%)
23.2 (85%)
23.62 (85%)
24.13 (80%)
內螺紋小徑
最小直径 最大直径
2.121 2.221
2.621 2.721
3.121 3.221
3.459 3.599
3.959 4.099
4.459 4.599
4.959 5.099
5.188 5.378
6.188 6.378
6.917 7.153
7.188 7.378
7.917 8.153
8.188 8.378
8.647 8.912
8.917 9.153
9.188 9.378
9.917 10.153
10.188 10.378
10.376 10.676
10.647 10.912
10.917 11.153
12.376 12.676
12.917 13.153
13.376 13.676
13.917 14.153
14.376 14.676
14.917 15.153
15.376 15.676
15.917 16.153
15.835 16.210
16.376 16.676
16.917 17.153
17.835 18.210
18.376 18.676
18.917 19.153
19.835 20.210
20.376 20.676
20.917 21.153
21.835 22.210
22.376 22.676
22.917 23.153
22.835 23.210
23.376 23.676
23.917 24.153


公制細牙螺紋-02 JIS 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
24.5 24.62 (85%) 24.376 24.676
M
26 × 1.5
25 25.2
(85%)
24.835 25.210
27 × 2
25.5 25.62 (85%) 25.376 25.676
27 × 1.5
26 26.13 (80%) 25.917 26.153
27 × 1
26 26.2
(85%)
25.835 26.210
28 × 2
26.5 26.62 (85%) 26.376 26.676
28 × 1.5
27 27.13 (80%) 26.917 27.153
28 × 1
27 27.2 (85%) 26.752 27.252
30 × 3
28 28.2 (85%) 27.835 28.210
30 × 2
28.5 28.62 (85%) 28.376 28.676
30 × 1.5
29 29.13 (80%) 28.917 29.153
30 × 1
30 30.2 (85%) 29.835 30.210
32 × 2
30.5 30.62 (85%) 30.376 30.676
32 × 1.5
30 30.2 (85%) 29.752 30.252
33 × 3
31 31.2 (85%) 30.835 31.210
33 × 2
31.5 31.62 (85%) 31.376 31.676
33 × 1.5
33.5 33.62 (85%) 33.376 33.676
35 × 1.5
33 33.2 (85%) 32.752 33.252
36 × 3
34 34.2 (85%) 33.835 34.210
36 × 2
34.5 34.62 (85%) 34.376 34.676
36 × 1.5
36.5 36.62 (85%) 36.376 36.676
38 × 1.5
36 36.2 (85%) 35.752 36.252
39 × 3
37 37.2 (85%) 36.835 37.210
39 × 2
37.5 37.62 (85%) 37.376 37.676
39 × 1.5
37 37.2 (85%) 36.752 37.252
40 × 3
38 38.2 (85%) 37.835 38.210
40 × 2
38.5 38.62 (85%) 38.376 38.676
40 × 1.5
38 38.1 (90%) 37.670 38.270
42 × 4
39 39.2 (85%) 38.752 39.252
42 × 3
40 40.2 (85%) 39.835 40.210
42 × 2
40.5 40.62 (85%) 40.376 40.676
42 × 1.5
41 41.1 (90%) 40.670 41.270
45 × 4
42 42.2 (85%) 41.752 42.252
45 × 3
43 43.2 (85%) 42.835 43.210
45 × 2
43.5 43.62 (85%) 43.376 43.676
45 × 1.5
44 44.1 (90%) 43.670 44.270
48 × 4
45 45.2 (85%) 44.752 45.252
48 × 3
46 46.2 (85%) 45.835 46.210
48 × 2




48 × 1.5
50 × 3
50 × 2
46.5
47
48
46.62 (85%)
47.2 (85%)
48.2 (85%)
46.376
46.752
47.835
46.676
47.252
48.210
50 × 1.5
48.5 48.62 (85%) 48.376
註(1)等級：6H
(2)基於JIS B 0211-1982標準
48.676
3、美制粗牙螺紋 (單位：mm)
螺纹尺寸
NO.1 -64UNC
2 -56
3 -48
4 -40
5 -40
6 -32
8 -32
10 -24
12 -24
14 -20
516

-18
38 -16
716 -14
12 -13
916 -12
58 -11
34 -10
78

-9
钻头直径
1.55
1.8
2.1
2.3
2.6
2.8
3.4
3.9
4.5
5.1
6.6
8
9.4
10.8
12.2
13.6
16.5
19.5
22.2
25
28.2
30.8
34
39.5
45.2
2B级螺纹下孔徑
1.57 (65%)
1.86 (65%)
2.14 (65%)
2.36 (70%)
2.69 (70%)
2.86 (75%)
3.52 (75%)
3.91 (80%)
4.57 (80%)
5.25 (80%)
6.72 (80%)
8.15 (80%)
9.50 (80%)
11.0 (80%)
12.3 (85%)
13.8 (85%)
16.8 (80%)
19.6 (85%)
22.5 (85%)
25.2 (85%)
28.4 (85%)
31.0 (85%)
34.2 (85%)
39.8 (85%)
45.3 (90%)









1

-8
1

18 -

7
1

14 -

7
1

38 -

6
1

12 -

6
1

34 -

5
2

- 4

內螺紋小徑
最小直径 最大直径
1.425 1.582
1.695 1.871
1.941 2.146
2.157 2.385
2.487 2.697
2.642 2.895
3.302 3.530
3.683 3.962
4.344 4.597
4.979 5.257
6.401 6.731
7.798 8.153
9.144 9.550
10.592 11.023
11.989 12.446
13.386 13.868
16.307 16.840
19.177 19.761
21.971 22.606
24.638 25.349
27.813 28.524
30.353 31.115
33.528 34.290
38.964 39.827
44.679 45.593





4、美制細牙螺紋 (單位：mm)
螺纹尺寸 钻头2B级螺纹下孔徑 內螺紋小徑
NO.

0-80UNF
1 -72
2 -64
3 -56
4 -48
5 -44
6 -40
8 -36
10 -32
12 -28
14 -28
516

-24
38 -24
716

-20
12 -20
916 -18
58 -18
34 -16
78 -14

1



-12
1
18
-12
1
14
-12
1
38
-12
1
12
-12
直径
1.25
1.55
1.85
2.1
2.4
2.7
2.9
3.5
4.1
4.6
5.5
6.9
8.5
9.9
11.5
12.9
14.5
17.5
20.5
23.2
26.5
29.5
32.8
36
1.30 (65%)
1.61 (65%)
1.90 (65%)
2.17 (70%)
2.44 (70%)
2.74 (70%)
3.02 (70%)
3.59 (75%)
4.14 (80%)
4.70 (80%)
5.56 (80%)
7.02 (80%)
8.61 (80%)
10.01 (80%)
11.60 (80%)
13.07 (80%)
14.65 (80%)
17.59 (85%)
20.6

(85%)
23.5

(85%)
26.7

(80%)
29.9

(80%)
33.0

(85%)
36.2

(85%)

最小直径
1.182
1.474
1.756
2.025
2.271
2.551
2.820
3.404
3.963
4.496
5.360
6.782
8.382
9.729
11.329
12.751
14.351
17.323
20.270
23.114
26.289
29.464
32.639
35.814

最大直径
1.305
1.612
1.912
2.197
2.458
2.740
3.022
3.606
4.165
4.724
5.588
7.035
8.636
10.033
11.607
13.081
14.681
17.678
20.675
23.571
26.746
29.921
33.096
36.271
5、英制粗牙螺紋

(單位：mm)
螺紋尺寸 下 孔 徑
A列(硬材B列(軟材
質) 質)
2.6 2.5
3.7 3.6
5.1 5.0
6.6 6.5
8.0 7.9
9.4 9.3
10.7 10.5
12.3 12.0
13.7 13.5
16.7 16.5
19.5 19.3
22.4 22.0
25.0 24.8
28.3 28.0
30.5 30.3
33.8 33.5
36.0 35.7
39.2 39.0
41.8 41.5
45.0 44.7
A列直徑
70.7
78.4
76.9
74.0
75.0
73.7
73.8
73.4
73.5
72.3
75.4
73.8
76.9
74.3
81.6
79.3
81.1
80.7
80.6
80.2
嵌 合 率
B列直徑 內螺紋最
小徑
83.0 70.0
85.8 70.0
83.0 70.5
99.5 70.1
80.0 69.5
80.0 69.0
81.2 69.0
84.4 69.0
80.3 69.6
78.4 69.6
80.9 70.1
83.6 71.0
81.3 72.0
80.7 72.0
85.3 73.8
84.8 73.8
85.7 74.8
83.8 74.8
84.7 74.7
84.4 74.7
內螺紋最
大徑
88.3
88.3
88.3
88.4
88.2
88.8
88.2
88.2
88.5
88.3
88.4
88.2
88.4
88.4
88.6
88.6
88.3
88.3
88.4
88.4
W

18
316
14
516
38
716
12
916
58
34
78
1
1
18
1
14
1
38
1
12
1
58
1
34
1
78
2

6、英制管用螺紋 (單位：mm)
管用螺紋
尺寸
JIS B 0203
錐管內螺紋Rc(PT) 平行內螺紋Rp(PS)
計 算 值 下 孔 徑 計 算 值 下 孔 徑
6.230
8.235
10.941
14.428
17.950
23.349
29.423
37.940
43.833
55.412
70.701
83.201
95.547
107.834
133.110
158.510
183.360
208.560
233.960
259.166
309.747
6.2
8.2
10.9
14.4
18
23
29
38
44
55
71
83
96
108
133
159
183
209
234
259
310
6.490
8.495
11.341
14.846
18.489
23.975
30.111
38.772
44.565
56.476
72.009
84.709
97.155
109.855
135.255
160.655
185.954
211.354
236.754
262.154
312.875
6.5
8.5
11.4
14.9
18.5
24
30
39
45
56
72
85
97
110
135
161
186
212
237
262
313
JIS B 2301
錐管內螺紋
計 算 值
－
8.191
10.945
14.388
17.943
23.305
29.353
37.890
43.720
55.406
70.788
83.364
95.747
108.322
133.597
158.810





116
18
14
38
12
34
1
1
14
1
12
2
2
12
3
3
12
4
5
6
7
8
9
10
12
管用螺紋
尺寸
下 孔
徑
－
8.2
10.9
14.4
18
23
29
38
43
55
70
83
95
108
133
158





7、美制管用耐密斜行螺紋(NPTF?NPSF) (單位：mm)
斜行螺紋(NPTF)
鑽頭直徑
使用鉸刀場合
平行螺紋(NPSF)
鑽頭直徑
不使用鉸刀
場合
14 116
18
14
38
12
34
－
2164
2764
916
1116
5764
1
1
14
1
12
2
2
12
1

18
1
1532
1
4564
2
316
2
1932
0.234 ( 5.94)
0.328 ( 8.33)
0.422 (10.72)
0.562 (14.27)
0.688 (17.48)
0.891 (22.63)
1.125 (28.58)
1.469 (37.31)
1.703 (43.26)
2.188 (55.58)
2.594 (65.89)
0.246 ( 6.25)
0.339 ( 8.61)
716
0.438 (11.13)
3764
0.578 (14.68)
4564
0.703 (17.86)
5964
0.922 (23.42)
1 1.156 (29.36)
532
1

12
1

4764

1
132
－
3764
2332
－
1
532
－
－
－
－
0.250 ( 6.35)
0.344 ( 8.74)
0.444 (11.28)
0.578 (14.68)
0.719 (18.26)
0.922 (23.42)
1.156 (29.36)
－
－
－
－
1.500 (38.10)
1.734 (44.04)
2.219 (56.36)
2.641 (67.08)
2
732
2
4164
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
RH
最小～最大
精度
M 1

×0.25
1.1×0.25
1.2×0.25
1.4×0.3
1.7×0.35
2

×0.4
2.3×0.4
2.5×0.45
2.6×0.45
3

×0.5
3.5×0.6
4

×0.7
5

×0.8
6

×1
7

×1
8

×1.25
8

×1
10

×1.5
10

×1.25
10

×1
12

×1.75
12

×1.5
12

×1.25
12

×1
14

×2
14

×1.5
16

×2
16

×1.5
18

×2.5
18

×1.5
20

×2.5
20

×1.5
2
2
2
2
2
2
2
2
2
3
3
4
4
4
4
5
4
5
5
5
5
5
5
5
6
5
6
5
6
6
6
6
(嵌合率％)
0.87 ~ 0.89

(100~85)
0.97 ~ 0.99

(100~85)
1.07 ~ 1.09

(100~85)
1.244~ 1.263

(100~85)
1.51 ~ 1.54

(100~80)
2級螺紋用下孔徑
RH
最小～最大
精度
4
4
4
4
4
4
4
4
4
5
5
6
6
7
7
7
7
7
7
7
8
7
7
7
10
9
10
9
11
10
11
10
(嵌合率％)
0.90 ~0.92 (100~80)
1.00 ~1.02 (100~80)
1.10 ~1.12 (100~80)
1.270~

1.294 (100~80)
1.54 ~ 1.58 (100~75)
1.81 ~ 1.85 (100~75)
2.11 ~ 2.15 (100~75)
2.28 ~ 2.33 (100~75)
2.38 ~ 2.43 (100~75)
2.76 ~ 2.81 (100~75)
3.20 ~ 3.26 (100~75)
3.65 ~ 3.70 (100~85)
4.59 ~ 4.66 (100~80)
5.48 ~ 5.57 (100~80)
6.48 ~ 6.57 (100~80)
7.34 ~ 7.41 (100~85)
7.48 ~ 7.57 (100~80)
9.18 ~ 9.28 (100~85)
9.34 ~ 9.41 (100~85)
9.48 ~ 9.57 (100~80)
11.05 ~11.15
(100~85)
11.18 ~11.28
(100~85)
11.34 ~11.41
(100~85)
11.48 ~11.57
(100~80)
12.92 ~13.04
(100~85)
13.21 ~13.30
(100~85)
14.92 ~15.04
(100~85)
15.21 ~15.30
(100~80)
16.63 ~16.78
(100~85)
17.22 ~17.31
(100~85)
18.63 ~18.78
(100~85)
19.22 ~19.31
1.78 ~ 1.82

(100~80)
2.08 ~ 2.12

(100~80)
2.25 ~ 2.29

(100~80)
2.35 ~ 2.39

(100~80)
2.74 ~ 2.78

(100~80)
3.18 ~ 3.21

(100~85)
3.63 ~ 3.67

(100~85)
4.57 ~ 4.62

(100~85)
5.45 ~ 5.51

(100~85)
6.45 ~ 6.51

(100~85)
7.31 ~ 7.38

(100~85)
7.45 ~ 7.51

(100~85)
9.16 ~ 9.22

(100~90)
9.31 ~ 9.38

(100~85)
9.46 ~ 9.52

(100~85)
11.01 ~11.08
(100~90)
11.16 ~11.22
(100~90)
11.31 ~11.38
(100~85)
11.46 ~11.52
(100~85)
12.83 ~12.95
(100~90)
13.16 ~13.22
(100~90)
14.87 ~14.95
(100~90)
15.16 ~15.22
(100~90)
16.57 ~16.67
(100~90)
17.17 ~17.23
(100~90)
18.57 ~18.67
(100~90)
19.17 ~19.23
螺紋尺寸
(100~90) (100~85)
9、美制粗牙螺紋(NRT) (單位：mm)
2B級螺紋用下孔徑 3B級螺紋用下孔徑
RH RH
最小～最大 最小～最大
精 度
(嵌合率％)
1.96 ~
2.02 (100~65)
2.25 ~
2.32 (100~65)
2.52 ~
2.60 (100~70)
2.86 ~
2.93 (100~70)
3.09 ~
3.17 (100~75)
3.75 ~
3.83 (100~75)
4.26 ~
4.35 (100~80)
4.92 ~
5.01 (100~80)
5.66 ~
5.76 (100~80)
7.18 ~
7.29 (100~80)
8.66 ~
8.78 (100~80)
10.11 ~10.25
(100~80)
10.62 ~11.78
(100~80)
13.14 ~13.27
(100~85)
14.62 ~14.76
(100~85)
17.67 ~17.88
(100~80)
20.68 ~20.85
(100~85)
23.65 ~23.84
(100~85)
精 度
3
3
3
3
3
4
4
4
4
5
5
5
6
8
8
9
9
10

(嵌合率％)
1.95 ~
2.23 ~
2.50 ~
2.83 ~
3.06 ~
3.74 ~
4.24 ~
4.90 ~
5.64 ~
7.15 ~
8.63 ~
NO.

2-
56UNC
3-48
4-40
5-40
6-32
8-32
10-24
12-24
14 -20
516 -18
38 -16
716 -14
12 -13
4
4
5
5
5
6
6
6
6
7
7
7
8
10












2.01 (100~65)

2.31 (100~65)

2.58 (100~70)

2.91 (100~70)

3.14 (100~75)

3.82 (100~75)

4.32 (100~80)

4.96 (100~85)

5.74 (100~80)

7.24 (100~85)

8.73 (100~85)
10.08 ~10.19 (100~85)
11.60 ~11.68 (100~90)
13.11 ~13.24 (100~85)
14.58 ~14.67 (100~90)
17.63 ~17.74 (100~90)
20.64 ~20.75 (100~90)
23.61 ~23.74 (100~90)
916 -12
11
58 -11
12
34 -10
12
78 - 9
13
1 - 8
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
RH
精 度
NO.

2-64UNF
3-56
4-48
5-44
6-40
8-36
10-32
12-28
14

-28
516-24
38 -24
3
4
4
4
5
5
5
5
5
6
6
2B級螺紋用下孔徑
最小～最大
(嵌合率％)
1.98 ~
2.29 ~
2.57 ~
2.88 ~
3.19 ~
3.80 ~
4.41 ~
5.00 ~
5.86 ~
7.38 ~
8.96 ~
RH
精 度
2
3
3
3
3
4
4
4
4
5
5
3B級螺紋用下孔徑
最小～最大
(嵌合率％)
1.97 ~
2.28 ~
2.56 ~
2.87 ~
3.16 ~
3.79 ~
4.40 ~
4.99 ~
5.85 ~
7.36 ~
8.95 ~

2.04 (100~65)

2.35 (100~65)

2.64 (100~70)

2.95 (100~70)

3.26 (100~70)

3.88 (100~75)

4.48 (100~80)

5.08 (100~80)

5.93 (100~80)

7.46 (100~80)

9.05 (100~80)

2.03 (100~65)

2.34 (100~65)

2.63 (100~70)

2.94 (100~70)

3.22 (100~75)

3.86 (100~75)

4.46 (100~80)

5.06 (100~80)

5.92 (100~80)

7.43 (100~85)

9.02 (100~85)
716-20
12

-20
916-18
58 -18
34 -16
78 -14
1 - 12
7
7
9
9
10
11
12
10.44 ~10.54 (100~80)
12.02 ~12.12 (100~80)
13.55 ~13.66 (100~80)
15.14 ~15.25 (100~80)
18.22 ~18.32 (100~85)
21.27 ~21.38 (100~85)
24.28 ~24.41 (100~85)

5
5
7
7
7
8
9

10.41 ~10.49 (100~85)
12.00 ~12.05 (100~90)
13.53 ~13.58 (100~90)
15.11 ~15.17 (100~90)
18.18 ~18.25 (100~90)
21.23 ~21.27 (100~95)
24.24 ~24.32 (100~90)
2、英制管用平行螺紋(NRT) (單位：mm)
螺紋尺寸
PF 18
14
38
12
34
RH精 度
6
7
7
8
8
最小～最大(嵌合率％)
9.24~

9.35 (100~80)
12.41~12.62 (100~75)
15.92~16.12 (100~75)
19.93~20.15 (100~80)
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
RH
最小～最大
精 度
M 1

×0.25
1.2×0.25
1.4×0.3
1.6×0.35
1.7×0.35
1.8×0.35
2 ×0.4
2 ×0.25
2.3×0.4
2.5×0.45
2.6×0.45
3 ×0.6
2
2
2
2
－
2
2
2
－
3
－
3
(嵌合率％)
0.858~0.879
(100~85)
1.058~1.079
(100~85)
1.23 ~1.26 (100~85)
1.40 ~1.44 (100~80)
1.50 ~1.54 (100~80)
1.60 ~1.64 (100~80)
1.77 ~1.82 (100~80)
1.858~1.887
(100~80)
2.07 ~2.12 (100~80)
2.24 ~2.30 (100~80)
2.34 ~2.40 (100~80)
2.72 ~2.73 (100~90)
2級螺紋用下孔徑
RH
最小～最大
精 度
4
4
4
4
4
4
4
－
4
5
5
5
(嵌合率％)
0.858~0.887 (100~80)
1.058~1.087 (100~80)
1.23 ~1.26 (100~80)
1.40 ~1.45 (100~75)
1.50 ~1.55 (100~75)
1.60 ~1.65 (100~75)
1.77 ~1.82 (100~80)
1.858~1.887 (100~80)
2.07 ~2.13 (100~75)
2.24 ~2.31 (100~75)
2.34 ~2.41 (100~75)
2.66 ~2.73 (100~90)
3 ×0.5
3 ×0.35
3.5×0.6
4 ×0.75
4 ×0.7
4 ×0.5
5 ×0.9
5 ×0.8
5 ×0.5
6 ×1
6 ×0.75
5
3
3
3
6
3
3
3
3
4
3
2.72 ~2.77 (100~80)
2.80 ~2.84 (100~80)
3.16 ~3.21 (100~85)
3.57 ~3.64 (100~85)
3.60 ~3.66 (100~85)
3.71 ~3.77 (100~80)
4.49 ~4.59 (100~85)
4.55 ~4.62 (100~85)
2.72 ~4.77 (100~80)
5.43 ~5.52 (100~85)
5.57 ~5.64 (100~85)
6
5
5
6
7
6
7
8
6
7
7



2.72 ~2.78 (100~75)
2.80 ~2.85 (100~75)
3.16 ~3.25 (100~75)
3.57 ~3.64 (100~85)
3.60 ~3.66 (100~85)
3.71 ~3.79 (100~75)
4.49 ~4.59 (100~85)
4.55 ~4.64 (100~80)
4.72 ~4.79 (100~75)
5.43 ~5.55 (100~80)
5.57 ~5.66 (100~80)



4、公制粗牙螺紋 HL-NRT (單位：mm)
螺 紋 尺 寸
M

3 ×0.5
4 ×0.7
5 ×0.8
6 ×1
8 ×1.25
10 ×1.5
10 ×1.25
12 ×1.75
12 ×1.5
12 ×1.25
RH精 度
3
4
4
4
5
5
5
5
5
5

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
M 2.5

× 0.45
2.6

× 0.45
3 × 0.5
4 × 0.7
5 × 0.8
6 × 1
8 × 1.25
10 × 1.5
下 孔 徑
最小直徑 最大直徑
2.60 2.65
2.70 2.75
3.12 3.20
4.17 4.30
5.16 5.33
6.25 6.42
8.31 8.52
10.37 10.62
鑽 頭 直 徑
2.6
2.7
3.1
4.2
5.2
6.3
8.4
10.5
最小～最大(嵌合率％)
3.39~3.43 (100~80)
4.54~4.58 (100~85)
5.61~5.66 (100~85)
6.75~6.81 (100~85)
8.93~9.01 (100~85)
11.11~11.17 (100~90)
10.93~11.01 (100~85)
13.28~13.17 (100~90)
13.11~13.17 (100~90)
12.93~13.01 (100~85)
12 × 1.75
14 × 2
16 × 2
18 × 2.5
20 × 2.5
22 × 2.5
24 × 2.5
12.43
14.49
16.49
18.58
20.58
22.58
24.70
12.73
14.83
16.83
19.04
21.04
23.04
25.25

12.5
14.5
16.5
19.0
21.0
23.0
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
2.64 2.74 2.7
4 – 40
2.95 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
14 – 20
6.63 6.78 6.7
516 – 8
8.33 8.48 8.4
38 – 16
9.91 10.11 10.0
716

– 14
11.51 11.76 11.5
12 – 13
13.08 13.34 13.1
916

– 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
2.97 3.05 3.0
NO. 4 –
48UNF
3.66 3.78 3.7
6 – 40
4.32 4.44 4.4
8 – 36
4.98 5.13 5.0
10 – 32
6.53 6.71 6.6
14 – 28
8.20 8.38 8.2
516 – 24
9.78 9.96 9.8
38 – 24
11.43 11.63 11.5
716 – 20
13.03 13.26 13.1
12 – 20
14.66 14.88 14.7
916 – 18
16.26 16.48 16.3
58 – 18
19.43 19.68 19.5
34 – 16
22.61 22.86 22.7
78 – 14
25.76 26.04 26.0
1 – 12













各 種 換 算 表

管用螺絲基準寸法(mm)
規 格
116

18

14

38

12

34

1
1
14

1
12

2
2
12

3
3
12

4
4
12

5
5
12

6
7
8
山 數

28
19
19
14
14
11
11
11
11
11
11
11
11
11
11
11
11
11
11
英制JIS(PT)
外 徑
7.723
9.728
13.157
16.662
20.955
26.441
33.249
41.910
47.803
59.614
75.184
87.884
100.330
113.030
125.730
138.430
151.130
163.830
189.230
214.630
有效徑

9.147
12.301
15.806
19.793
25.279
31.770
40.431
46.324
58.135
73.705
86.405
98.851
111.551
124.251
136.951
149.651
162.351
187.751
213.151

山 數
27
27
18
18
14
14
11
12

11
12

11
12

11
12

8
8
8
8

8

8

8
美式ASA(NPT)
外 徑 有效徑
7.77 7.142
10.116 9.489
13.427 12.487
16.866 15.926
20.980 19.772
26.326 25.117
33.932 31.461
41.689 40.218
47.689 46.287
59.796 58.325
72.273 70.159
88.182 86.068
100.691 98.776
113.548 111.433

141.3 138.412

168.3 165.252

219.1 215.901
美制螺絲外徑公厘(mm)換算表
規 格
NO.

0

1
2
3
4
5
6
8
10
12
吋
0.0600
0.0730
0.0860
0.0990
0.1120
0.1250
0.1380
0.1640
0.1900
0.2160






mm
1.524
1.854
2.184
2.515
2.845
3.175
3.505
4.166
4.826
5.486
山數節距換算表
山 數(每25.4mm)
100
80
節 距
mm
0.2540
0.3175
72
64
60
56
48
44
40
36
32
28
24
20
18
16
14
13
12
11
10
9
8
7
6
5
4
12
4
3
12
3
14
3
2
78
2
34
2
58
2
12
0.3528
0.3969
0.4233
0.4536
0.5292
0.5773
0.6350
0.7056
0.7938
0.9071
1.0583
1.2700
1.4111
1.5875
1.8143
1.9538
2.1167
2.3091
2.5400
2.8222
3.1750
3.6286
4.2333
5.0800
5.6444
6.3500
7.2571
7.8154
8.4667
8.8348
9.2364
9.6762
10.1600