合成标准不确定度公式攻牙下孔径对照表

2020年11月6日发(作者：汤义方)

建議下孔徑





Recommended Tap Drill Sizes


◎
公製牙
Drill
Size
(mm)
0.75
0.80
0.85
0.90
0.95
1.00
1.10
1.20
1.25
1.40
1.35
1.45
1.45
1.60
1.60
1.75
1.75
1.95
1.90
2.05
D1(mm)
Max.
0.785
(0.821)
0.885
(0.921)
0.985
Min.
0.729
(0.783)
0.829
(0.883)
0.929
Drill
Size
(mm)
5.3
5.5
6.0
6.3
6.5
6.8
7.0
7.3
7.5
7.8
8.0
8.3
8.5
8.8
9.0
9.3
9.5
9.5
10.0
10.3
D1(mm)
Max.
5.378
5.550
6.153
6.378
6.550
6.912
7.153
7.378
7.520
7.912
8.153
8.378
8.676
8.912
9.153
9.378
9.520
9.676
10.153
10.378
Min.
5.118
5.400
5.917
6.188
6.400
6.647
6.917
7.188
7.400
7.647
7.917
8.188
8.376
8.647
8.917
9.188
9.400
9.376
9.917
10.188
Nominal
Size
M1 x0.25
M1 x0.2
M1.1 x0.25
M1.1 x0.2
M1.2 x0.25
M1.2 x0.2
M1.4 x0.3
M1.4 x0.2
M1.6 x0.35
M1.6 x0.2
M1.7 x0.35
*M1.7 x0.2
M1.8 x0.35
M1.8 x0.2
M2 x0.4
M2 x0.25
M2.2 x0.45
M2.2 x0.25
M2.3 x0.4
*M2.3 x0.25
Nominal
Size
M6 x0.75
*M6 x0.5
M7 x1
M7 x0.75
*M7 x0.5
(1.021) (0.983)
M8 x1.25
1.142 1.075
M8 x1
(1.221) (1.183)
M8 x0.75
1.321 1.221
*M8

x0.5
(1.421) (1.383)
M9 x1.25
1.421
1.500
1.521
(1.621)
1.679
(1.785)
1.838
(1.985)
1.979
2.061
1.321
1.460
1.421
(1.583)
1.567
(1.729)
1.713
(1.929)
1.867
2.001
M9 x1
M9 x0.75
M10 x1.5
M10 x1.25
M10 x1
M10 x0.75
*M10x0.5
M11 x1.5
M11 x1
M11 x0.75
M2.5 x0.45
M2.5 x0.35
M2.6 x0.45
*M2.6 x0.35
M3 x0.5
M3 x0.35
M3.5 x0.6
M3 x0.35
M4 x0.7
M4 x0.5
M4.5 x0.75
M4.5 x0.5
M5 x0.8
M5 x0.5
M6 x1
●
D1：
2.10
2.20
2.20
2.20
2.50
2.70
2.90
3.20
3.30
3.50
3.80
4.00
4.20
4.50
5.00
2.138
2.221
2.238
2.246
2.599
2.721
3.010
3.221
3.422
3.599
3.878
4.099
4.334
4.599
5.153
2.013
M12 x1.75
2.121
M12 x1.5
2.113
M12 x1.25
2.189
M12 x1
2.459
*M12x0.5
2.621
2.850
3.121
3.242
3.459
3.688
3.959
4.134
4.459
4.917
M14 x2
M14 x1.5
M14 x1
M15 x1.5
M15 x1
M16 x2
M16 x1.5
M16 x1
M17 x1.5
M17 x1
10.3
10.5
10.8
11.0
11.5
12.0
12.5
13.0
13.5
14.0
14.0
14.5
15.0
15.5
16.0
10.441 10.106
10.676
10.912
11.153
11.520
12.210
12.676
13.153
13.676
14.153
14.210
14.676
15.153
15.676
16.153
10.376
10.647
10.917
11.400
11.835
12.376
12.917
13.376
13.917
13.835
14.376
14.917
15.376
15.917
●
The reccommended tap drill sizes indicated above are for JIS Class 2 Metric threads.
Minor diameter of JIS Class 2 internal thread.
But, the minor diameters D1 shown in ( ) are of JIS Class I internal threads
because their nominal sizes are not specified in JIS Class 2.
●
* Marked sizes have been eliminated from JIS since 1969.
◎
公製牙
Nominal
Size
M18 x2.5
M18 x2
M18 x1.5
M18 x1
M20 x2.5
M20 x2
M20 x1.5
M20 x1
M22 x2.5
M22 x2
Drill
Size
(mm)
15.5
16.0
16.5
17.0
17.5
18.0
18.5
19.0
19.5
20.0
D1(mm)
Max.
15.744
16.210
16.676
17.153
18.210
18.676
19.153
19.744
20.210
Min.
15.294
15.835
16.376
16.917
17.835
18.376
18.917
19.294
19.835
Nominal
Size
M33 x3
M33 x2
M33 x1.5

M35

x1.5
M36 x3
M36 x2
M36 x1.5
M38 x1.5
M39 x4
Drill
Size
(mm)
30.0
31.0
31.5
33.5
32.0
33.0
34.0
34.5
36.5
35.0
D1(mm)
Max.
30.252
31.210
31.676
33.676
33.252
34.210
34.676
36.676
35.270
Min.
29.752
30.835
31.376
33.376
32.752
33.835
34.376
36.376
34.670
17.744 17.294
M36 x4
32.270 31.670
M22 x1.5
M22 x1
M24 x3
M24 x2
M24 x1.5
M24 x1
M25 x2
M25 x1.5
M25 x1
M26 x1.5
M27 x3
M27 x2
M27 x1.5
M27 x1
M28 x2
M28 x1.5
M28 x1
M30 x3.5
M30 x3
M30 x2
M30 x1.5
M30 x1
M32 x2
M32 x1.5
M33 x3.5
●
D1：
20.5
21.0
21.0
22.0
22.5
23.0
23.0
23.5
24.0
24.0
24.0
25.0
25.5
26.0
26.0
26.5
27.0
26.5
27.0
28.0
28.5
29.0
30.0
30.5
29.5
20.676 20.376
M39 x3
21.153 20.917
M39 x2
21.252 20.752
M39 x1.5
22.210 21.835
M40 x3
22.676 22.376
M40 x2
23.153
23.210
23.676
24.153
24.676
24.252
25.210
25.676
26.153
28.210
26.676
27.153
16.771
27.252
28.210
28.676
29.153
30.210
30.676
29.771
22.917
22.835
23.376
23.917
24.376
23.752
24.835
25.376
25.917
25.835
26.376
26.917
26.211
26.752
27.835
28.376
28.917
29.835
30.376
29.211
M40 x1.5
M42 x4.5
M42 x4
M42 x3
M42 x2
M42 x1.5
M45 x4.5
M45 x4
M45 x3
M45 x2
M45 x1.5
M48 x5
M48 x4
M48 x3
M48 x2
M48 x1.5
M50 x3
M50 x2
M50 x1.5

36.0
37.0
37.5
37.0
38.0
38.5
37.5
38.0
39.0
40.0
40.5
40.5
41.0
42.0
43.0
43.5
43.0
44.0
45.0
46.0
46.5
47.0
48.0
48.5

36.252 35.752
37.210
37.676
37.252
38.210
38.676
37.799
38.270
39.252
40.210
40.676
40.799
41.270
42.252
43.210
43.676
43.297
44.270
45.252
46.210
46.676
47.252
48.210
48.676

36.835
37.376
36.752
37.835
38.376
37.129
37.670
38.752
39.835
40.376
40.129
40.670
41.752
42.835
43.376
42.587
43.670
44.752
45.835
46.376
46.752
47.835
48.376

●
The reccommended tap drill sizes indicated above are for JIS Class 2 Metric threads.
Minor diameter of JIS Class 2 internal thread.
But, the minor diameters D1 shown in ( ) are of JIS Class I internal threads
because their nominal sizes are not specified in JIS Class 2.


◎
美製牙 ─ UNC，UNF
Drill D1(mm) Drill D1(mm)

Nominal Size

Size Size
Max. Min. Max. Min.
(mm) (mm)
Nominal Size
No. 0-80UNF
1.25
No. 1-64UNC
1.55
No. 1-72UNF
1.55
No. 2-56UNC
1.80
No. 2-64UNF
1.85
No. 3-48UNC
No. 3-56UNF
No. 4-40UNC
No. 4-48UNF
No. 5-40UNC
No. 5-44UNF
No. 6-32UNC
No. 6-40UNF
No. 8-32UNC
No. 8-36UNF
No.10-24UNC
No.10-32UNF
No.12-24UNC
No.12-28UNF
No.12-32UNEF
1 4-20UNC
1 4-28UNF
1 4-32UNEF
516-18UNC
516-24UNF
516-32UNEF
3 8-16UNC
3 8-24UNF
3 8-32UNEF
716-14UNC
716-20UNF
716-28UNEF
1 2-13UNC
1 2-20UNF
1 2-28UNEF
2.1
2.1
2.3
2.4
2.6
2.7
2.8
2.9
3.4
3.5
3.9
4.1
4.5
4.6
4.7
5.1
5.5
5.6
6.6
6.9
7.1
8.0
8.5
8.7
9.4
9.9
10.2
10.8
11.5
11.8
1.305
1.582
1.612
1.871
1.912
2.146
2.197
2.385
2.458
2.697
2.740
2.895
3.022
3.530
3.606
3.962
4.165
4.597
4.724
4.826
5.257
5.588
5.690
6.731
7.035
7.264
8.153
8.636
8.865
9.550
10.033
10.338
11.023
11.607
11.938
1.182
58-24UNEF
1.425
34-10UNC
1.474
34-16UNF
1.695
34-20UNEF
1.756
78- 9UNC
1.941
2.025
2.157
2.271
2.487
2.551
2.642
2.820
3.302
3.404
3.683
3.963
4.344
4.496
4.623
4.979
5.360
5.486
6.401
6.782
7.087
7.798
8.382
8.661
9.144
9.729
10.135
10.592
11.329
11.709
78-14UNF
78-20UNEF
1 - 8UNC
1 -12UNF
1 -20UNEF
118- 7UNC
118-12UNF
118-18UNEF
118- 8UN
114- 7UNC
114-12UNF
114-18UNEF
114- 8UN
138- 6UNC
138-12UNF
138-18UNEF
138- 8UN
112- 6UNC
112-12UNF
112-18UNEF
112- 8UN
158-18UNEF
158- 8UN
158-12UN
134- 5UNC
134- 8UN
134-12UN
2 -4 12UNC
2 - 8UN
2 -12UN
14.8 14.986 14.732
16.5
17.5
17.8
19.5
20.5
21.0
22.2
23.2
24.0
25.0
26.5
27.2
25.5
28.2
29.5
30.2
28.5
30.8
32.8
33.5
31.8
34.0
36.0
36.5
35.0
39.8
38.2
39.2
39.5
41.2
42.2
45.2
47.8
48.5
16.840
17.678
17.958
19.761
20.675
21.133
22.606
23.571
24.308
25.349
26.746
27.381
25.781
28.524
29.921
30.556
28.956
31.115
33.096
33.731
32.131
34.290
36.271
36.881
35.306
40.081
38.481
39.446
39.827
41.656
42.621
45.593
48.006
48.971
16.307
17.323
17.678
19.177
20.270
20.853
21.971
23.114
24.028
24.638
26.289
27.051
25.146
27.813
29.464
30.226
28.321
30.353
32.639
33.401
31.496
33.528
35.814
36.576
34.671
39.751
37.846
38.989
38.964
41.021
42.164
44.679
47.371
48.514
916-12UNC
916-18UNF
916-24UNEF
5 8-11UNC
5 8-18UNF
12.2 12.446 11.989
12.9
13.2
13.6
14.5
13.081
13.386
13.868
14.681
12.751
13.132

13.386
14.351

●
The recommended tap drill sizes indicated above are for JIS Class 2B UNC & UNF
threads, and ANSI BI . Ia Class 2B UNEF & UN threads.
●
D1：Minor diameter of internal thread.
For UNC and UNF threads, according to JIS Class 2B;
For UNEF and UN threads, according to ANSI BI . Ia, Class 2B.


◎
英製牙 ─ BSW
Tap Drill Size
(mm)
A
* 1 8 W 40
* 532 W 32
* 316 W 24
1 4 W 20
516 W 18
3 8 W 16
716 W 14
1 2 W 12
916 W 12
5 8 W 11
3 4 W 10
2.65
3.25
3.75
5.1
6.6
8.0
9.4
10.7
12.3
13.7
16.7
B
2.60
3.20
3.70
5.0
6.5
7.9
9.3
10.5
12.0
13.5
16.5
7 8 W 9
1 W 8
1 1 8 W 7
1 1 4 W 7

1 3 8 W 6
1 1 2 W 6
1 5 8 W 5
1 3 4 W 5
1 7 8 W 4 12
2 W 4 12

Tap Drill Size
(mm)
A
19.5
22.4
25.0
28.3
30.5
33.8
36.0
39.2
41.8
45.0

B
19.3
22.0
24.8
28.0
30.3
33.5
35.7
39.0
41.5
44.7

Nominal Size Nominal Size
●
The recommended tap drill sizes indicated above are for JIS Class 2 Whitworth
threads.
●
Generally, the tap drill sizes in column A are used for producing holes; When holes
tend to be cut oversized, the tap drill sizes in column B should be selected.
●
These tap drill sizes are in accordance with JIS B 1004
-1966
, while the nominal
sizes
with a * mark are in accordance with BSW (Please refer to page 135).

◎
管牙
PT Pipe Thread
Tap Drill Size
With
Reaming
Before
Tapping
(mm)
6.1
8.1
10.7
14.2
17.6
23.0
29.0
37.5
43.4
54.9
Internal Thread
Minor
Without
Dia. on [Min.]
Reaming
Length
Before Tapping
of Useful Thread
(mm)
(mm)
6.2
8.2
11.0
14.5
18.0
23.5
29.5
38.0
44.0
55.5
6.244
8.249
10.962
14.448
17.979
23.378
29.459
37.976
43.869
55.412
Internal Thread
Minor
Dia. on [Min.]
Gauge
Length
(mm)
6.384
8.388
11.174
14.658
18.263
23.663
29.822
38.339
44.232
55.844
Nominal Size
*PT 116-28
PT 1 8-28
PT 1 4-19
PT 3 8-19
PT 1 2-14
PT 3 4-14
PT -11
PT1 14-11
PT1 12-11
PT2 -11
●
* PTI 16 is according to JIS B 0203
-1982
Rc internal thread.

PS Pipe Thread PF Pipe Thread
Drill Size
D1 (mm)
Drill Size
D1 (mm)
Nominal Size Nominal Size
(mm) (mm)
Max. Min. Max. Min.
*PS116-28
PS 1 8-28
PS 1 4-19
PS 3 8-19
PS 1 2-14
PS 3 4-14
PS1 -11
PS1 14 -11
PS1 12 -11
PS2 -11
6.632 6.490
*PF116-28
8.637 8.495
PF 1 8-28
11.549 11.341
PF 1 4-19

3 8-19
15.0 15.054 14.846

PF
18.5 18.773 18.489
PF 1 2-14
24.0 24.259 23.975
PF 3 4-14
30.2 30.471 30.111
PF1 -11
38.8 39.132 38.772
PF1 14 -11
44.8 45.025 44.665
PF1 12 -11
56.5 56.836 56.476
PF2 -11
6.5
8.5
11.4
6.7
8.7
11.7
6.843 6.561
8.848 8.566
11.890 11.445
15.2 15.395 14.950
19.0 19.172 18.631
24.5 24.658 24.117
30.5 30.931 30.291
39.2 39.592 38.952
45.0 45.485 44.845
57.0 57.296 56.656
●
* PSI16 is according to JIS B
●
* PFI16 is according to JIS B
0203
-1982
Rp internal thread.



0203
-1982
G internal thread.
The reccommended tap drill sizes
indicated above are for JIS Class A PF
threads.

◎
管牙
American standard Pipe Thread *1
Tap Drill Size
NPT
Nominal Size
With Reaming
Tapping
mm
116-27
1 8-27
1 4-18
3 8-18
1 2-14
3 4-14
1 -14 12
1 14 -11 12
1 12 -11 12
2 -11 12
2 12 2-8
5.94
8.33
10.72
14.27
17.48
22.63
28.58
37.31
43.26
55.17
65.48
inch
0.234
0.328
0.422
0.562
0.688
0.891
1.125
1.469
1.703
2.172
2.578
Without Reaming
Tapping
mm
6.15
8.43
11.13
14.27
17.86
23.01
28.98
37.69
43.66
55.58
66.27
inch
0.242
0.332
0.438
0.562
0.703
0.906
1.141
1.484
1.719
2.188
2.609
NPSC
mm inch
6.35 0.250
8.74 0.344
11.13 0.438
14.68 0.578
18.26 0.719
23.42 0.922
29.36 1.156
38.10 1.500
44.45 1.750
56.36 2.219
67.46 2.656

●
*1The above drill sizes are according to ANSIASME BI.20.1
-1983
Pipe
Threads,
General Purpose (inch) (partial listing).

Dryseal American standard Pipe Thread *2
Tap Drill Size
NPTF
Nominal Size
With Reaming
Tapping
mm inch
Without Reaming
Tapping
mm inch
NPSF
mm inch
116-27
1 8-27
1 4-18
3 8-18
1 2-14
3 4-14
1 -11 12
1 14 -11 12
1 12 -11 12
2 -11 12
2 12 2-8
5.94
8.33
10.72
14.27
17.48
22.63
28.58
37.31
43.26
55.17
65.48
0.234
0.328
0.422
0.562
0.688
0.891
1.125
1.469
1.703
2.172
2.578
6.15
8.43
11.13
14.27
17.86
23.01
28.98
37.69
43.66
55.58
66.27
0.242
0.332
0.438
0.562
0.703
0.906
1.141
1.484
1.719
2.188
2.609
6.25 0.246
8.61 0.339
11.13 0.438
14.68 0.578
17.86 0.703
23.42 0.922
29.36 1.156




●
*2The above drill sizes are according to ANSIASME BI.20.3
-1976
Pipe
Threads,
(inch) (partial listing).


◎
For Threads Using with Helical Coil Wire inserts
Metric Thread
Tap Drill Size
Recommended Hole Size (mm)
Nominal Size
(mm)
Max. Min.
M 3×0.5
M 4×0.7
M 5×0.8
M 6×1
M 8×1.25
M10×1.5
M10×1.25
M10×1
M12×1.75
M12×1.5
M12×1.25
M14×2
M14×1.5
M16×2
M16×1.5
M18×2.5
3.1
4.2
5.2
6.3
8.4
10.5
10.4
10.3
12.5
12.5
12.5
14.5
14.5
16.5
16.5
19.0
3.20
4.30
5.33
6.42
8.52
10.62
10.52
10.42
12.73
12.62
12.52
14.83
14.62
16.83
16.62
19.04
3.12
4.17
5.16
6.25
8.31
10.37
10.31
10.25
12.43
12.37
12.31
14.49
14.37
16.49
16.37
18.58
M18×2.5
M20×2.5
M20×1.5
insert
manufacturers.
18.5
21.0
20.5
18.62
21.04
20.62
18.37
20.58
20.37
●
The figures listed above are according to the data provided by helical coil wire

◎
無溝絲攻下孔徑
R-S . R-G Hole Size (mm) R-Z Hole Size (mm)
Tolerance Class of Tap Tolerance Class of Tap
Nominal Size Nominal Size
G3.G4 G5.G6 G7.G8 G7.G8 G9.G10
M1 ×0.25
M1.1×0.25
M1.2×0.25
M1.4×0.3
M1.6×0.35
M1.7×0.35
M1.8×0.35
M2 ×0.4
M2.2×0.45
M2.3×0.4
M2.5×0.45
M2.6×0.45
M3 ×0.5
M3 ×0.35
M3.5×0.6
M4 ×0.7
M4 ×0.5
M5 ×0.8
M5 ×0.5
M6 ×1
0.86
0.96
1.06
1.24
1.41
1.51
1.61
1.78
1.95
2.08
－
－
－
－
－
－
－
－
－
－
－
－
0.88
0.98
1.08
1.25
1.43
1.53
1.63
1.80
1.98
2.10
2.28
2.38
2.75
2.83
3.20
3.65
3.75
4.60
4.75
5.50
－
－
－
－
－
－
－
M 8×1.25
M 8×1
M10×1.5
M10×1.25
M10×1
7.44
7.55
9.32
9.44
9.55
11.21
11.32
11.44
11.55
13.10
13.32
13.55
15.10
15.32
15.55
7.50
7.60
9.40
9.50
9.60
11.30
11.40
11.50
11.60
13.20
13.40
13.60
15.20
15.40
15.60
M12×1.75
－
M12×1.5
－
M12×1.25
－
M12×1
－

M14×2
－
M14×1.5
M14×1
2.78
M16×2
－
M16×1.5
3.23
M16×1
3.69
3.78
4.64

4.78
5.55
－
－

M6 ×0.75
M6 ×0.5
M7 ×1

－
－
－
5.63
5.75
6.50
5.66
5.78

6.55