APPENDIX 4 TABLE CONVERSION OF PIPE SIZES TO METRIC
23 ноября, 2014 
Oleg Maloletnikov |
U. S. Customary Units |
SI (Metric) Units |
||
|
Nominal |
Outside |
Diameter |
Outside |
|
Pipe Size |
Diameter |
Number |
Diameter |
|
(NPS) |
(in.) |
(DN) |
(mm) |
|
'/8 |
0.405 |
3 |
10.3 |
|
1/4 |
0.540 |
6 |
13.7 |
|
38 |
0.675 |
10 |
17.1 |
|
1/2 |
0.840 |
15 |
21.3 |
|
3/4 |
1.050 |
20 |
26.7 |
|
1 |
1.315 |
25 |
33.4 |
|
1V4 |
1.660 |
30 |
42.2 |
|
112 |
1.900 |
40 |
48.3 |
|
2 |
2.375 |
50 |
60.3 |
|
212 |
2.875 |
65 |
73.0 |
|
3 |
3.500 |
80 |
88.9 |
|
312 |
4.000 |
90 |
101.6 |
|
4 |
4.500 |
100 |
114.3 |
|
5 |
5.563 |
125 |
141.3 |
|
6 |
6.625 |
150 |
168.3 |
|
8 |
8.625 |
200 |
219.1 |
|
10 |
10.75 |
250 |
273.0 |
|
12 |
12.75 |
300 |
323.8 |
|
14 |
14.00 |
350 |
355.6 |
|
16 |
16.00 |
400 |
406.4 |
|
18 |
18.00 |
450 |
457 |
|
20 |
20.00 |
500 |
508 |
|
24 |
24.00 |
600 |
601 |
|
Courtesy: (ASME) American Society of Mechanical Engineers. |
APPENDIX 5 DRILL DIMENSION CHART
The NC and NF tables recommend tap drills that result in approximately 75% thread height based upon drill diameter. In most materials, however, drills will produce a hole slightly larger than the drill diameter.
The tables list actual thread height percentages resulting from the probable hole size each drill will cut.
Thread heights over 60% of thread do not increase the strength of a threaded joint.
|
Machine Screw Sizes NC & NF |
||||
|
Nom. Size Tap |
Recommended Tap Drill |
Probable Hole Size |
Actual % Thread |
|
|
Drill |
Decimal |
|||
|
0-80 |
3/64 |
.0469 |
.0484 |
71 |
|
1-64 |
53 |
.0595 |
.0610 |
59 |
|
1-72 |
53 |
.0595 |
.0610 |
67 |
|
2-56 |
50 |
.0700 |
.0717 |
62 |
|
2-64 |
50 |
.0700 |
.0717 |
70 |
|
3-48 |
47 |
.0785 |
.0804 |
69 |
|
3-56 |
46 |
.0810 |
.0829 |
69 |
|
4-40 |
43 |
.0890 |
.0910 |
65 |
|
4-48 |
3/32 |
.0938 |
.0958 |
60 |
|
5-40 |
38 |
.1015 |
.1038 |
65 |
|
5-44 |
37 |
.1040 |
.1063 |
63 |
|
6-32 |
36 |
.1065 |
.1091 |
71 |
|
6-40 |
33 |
.1130 |
.1156 |
69 |
|
8-32 |
29 |
.1360 |
.1389 |
62 |
|
8-36 |
29 |
.1360 |
.1389 |
70 |
|
10-24 |
26 |
.1470 |
.1502 |
74 |
|
10-32 |
21 |
.1590 |
.1622 |
68 |
|
12-24 |
16 |
.1770 |
.1805 |
66 |
|
12-28 |
15 |
.1800 |
.1835 |
70 |
|
Taper Pipe Taps |
||
|
Nominal Size |
Tap Drill |
|
|
NPT |
NPTF |
|
|
1/16-27 |
D |
D |
|
78-27 |
Q |
R |
|
74-18 |
7/16 |
7/16 |
|
3/8-18 |
9/16 |
37/64 |
|
У2-14 |
45/64 |
45 /64 |
|
54-14 |
29/32 |
59/64 |
|
1-111/2 |
1%4 |
15/32 |
|
11/4-111/2 |
131/64 |
1У2 |
|
11/2-111/2 |
147/64 |
147/64 |
|
2-11У2 |
2% |
27/32 |
|
21/2-8 |
25/8 |
241/64 |
|
3-8 |
31/4 |
3% |
|
Fractional Sizes NC & NF |
||||
|
Nom. Size Tap |
Recommended Tap Drill |
Probable Hole Size |
Actual % Thread |
|
|
Drill |
Decimal |
|||
|
14-20 |
7 |
.2010 |
.2048 |
70 |
|
14-28 |
3 |
.2130 |
.2168 |
72 |
|
5/i6-18 |
F |
.2570 |
.2608 |
72 |
|
4 2 і |
I |
.2720 |
.2761 |
67 |
|
38 16 |
5/16 |
.3125 |
.3189 |
72 |
|
3/8-24 |
Q |
.3320 |
.3364 |
71 |
|
716-14 |
U |
.3680 |
.3726 |
70 |
|
716-20 |
25/64 |
.3906 |
.3952 |
65 |
|
У2-13 |
27/64 |
.4219 |
.4266 |
73 |
|
У2-20 |
29/64 |
.4531 |
.4578 |
65 |
|
9/16-12 |
31/64 |
.4844 |
.4892 |
68 |
|
9/16-18 |
33/64 |
.5156 |
.5204 |
58 |
|
5/8—11 |
17/32 |
.5313 |
.5362 |
75 |
|
У8-18 |
37/64 |
.5781 |
.5831 |
58 |
|
3/4-10 |
21/32 |
.6563 |
.6613 |
68 |
|
3/4-16 |
11/16 |
.6875 |
.6925 |
71 |
|
7/8-9 |
49/64 |
.7656 |
.7708 |
72 |
|
7/8-14 |
13/16 |
.8125 |
.8177 |
62 |
|
1-8 |
7/8 |
.8750 |
.8809 |
73 |
|
1-12 |
59/64 |
.9219 |
.9279 |
67 |
|
Straight Pipe Taps |
||
|
Nominal Size |
Tap Drill |
|
|
NPS |
NPSF |
|
|
1/16-27 |
1/4 |
14 |
|
1/8-27 |
11/32 |
11/32 |
|
1/4-18 |
716 |
7/16 |
|
3/8-18 |
37/64 |
37/64 |
|
1/2-14 |
23/32 |
23/32 |
|
3/4-14 |
59/64 |
59/64 |
|
1-111/2 |
15332 |
1532 |
|
11/4—111/2 |
11/2 |
11/2 |
|
11/2 111/2 |
134 |
134 |
|
2-111/2 |
27/32 |
2732 |
|
(Reprinted with permission of Wholesale Tool.) |
Опубликовано в BLUEPRINT READING FOR WELDERS