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词条 List of drill and tap sizes
释义

  1. Rules of thumb

  2. Examples

  3. Chart

  4. See also

  5. References

  6. External links

Below is a comprehensive drill and tap size chart for all drills and taps, imperial and metric, up to {{convert|36.5|mm|in|2}} in diameter.

In manufactured parts, holes with female screw threads are often needed; they accept male screws to facilitate the building and fastening of a finished assembly. One of the most common ways to produce such threaded holes is to drill a hole of appropriate size with a drill bit and then tap it with a tap. Each standard size of female screw thread has one or several corresponding drill bit sizes that are within the range of appropriate size—slightly larger than the minor diameter of the mating male thread, but smaller than its pitch and major diameters. Such an appropriately sized drill is called a tap drill for that size of thread, because it is a correct drill to be followed by the tap. Many thread sizes have several possible tap drills, because they yield threads of varying thread depth between 50% and 100%. Usually thread depths of 60% to 75% are desired.

People frequently use a chart such as this to determine the proper tap drill for a certain thread size or the proper tap for an existing hole.

Rules of thumb

Regarding the proportion of tap drill to thread major diameter, for standard V threads (ISO V thread and UTS V thread), there are several rules of thumb with strong predictive power:

  • A good tap drill is 85% (± 2 pp) of major diameter for coarse threads, and
    A good tap drill is 90% (± 2 pp) of major diameter for fine threads.
  • For metric V threads, the concept of major minus pitch (i.e., the major or widest diameter of the intended screw in millimeters minus the pitch of the threads of that screw in millimeters per thread) yields a good tap drill diameter.{{paragraph}} The major minus pitch technique also works for inch-based threads, but you must first calculate the pitch by converting the fraction of threads-per-inch (TPI) into a decimal. For example, a screw with a pitch of 1/20{{nbsp}}in (20 threads per inch) has a pitch of 0.050{{nbsp}}in and a {{frac|1|13}}{{nbsp}}in pitch (13 threads per inch) has a pitch of 0.077{{nbsp}}in. Your result will only land near a tap drill size (not directly on one).
  • For both of these rules of thumb (85%/90% and major minus pitch), the tap drill size yielded is not necessarily the only possible one, but it is a good one for general use.
  • The 85% and 90% rules works best in the range of {{convert|1/4|–|1|in|abbr=on}}, the sizes most important on many shop floors. Some sizes outside that range have different ratios.

Below, these guidelines are explored with examples.

Examples

  • A good tap drill is 85% (± 2 pp) of major diameter for coarse threads, and
    a good tap drill is 90% (± 2 pp) of major diameter for fine threads. [1]
    • Example (inch, coarse): For size {{frac|7|16}} (this is the diameter of the intended screw in fraction form)-14 (this is the number of threads per inch; 14 is considered coarse), 0.437{{nbsp}}in × 0.85 = 0.371{{nbsp}}in. Therefore, a size {{frac|7|16}} screw ({{frac|7|16}} ≈ 0.437) with 14 threads per inch (coarse) needs a tap drill with a diameter of about 0.371 inches.
    • The drill sizes that are near this are letter U (0.368{{nbsp}}in; 84.2%), 9.5 mm (0.374{{nbsp}}in; 85.6%), and {{frac|3|8}}{{nbsp}}in (0.375{{nbsp}}in; 85.8%); any of these will work well.
    • Example (inch, fine): For {{frac|7|16}}-20 (same diameter as the previous example, but this time with 20 threads per inch, which is considered fine), 0.437{{nbsp}}in × 0.90 = 0.393{{nbsp}}in (i.e., if the threads are to be fine, then a slightly larger diameter drill bit should be used before tapping the hole for the screw).
    • The drill sizes that are near this are {{frac|25|64}} (0.391{{nbsp}}in; 89.4%), 10 mm (0.393{{nbsp}}in; 90%), and letter X (0.397{{nbsp}}in; 90.8%); any of these will work well.
    • Example (metric, coarse): For M7.0×1.0 (an intended screw with a diameter of 7.0 mm and a pitch of 1 mm between each thread, which is considered coarse), 7.0{{nbsp}}mm × 0.85 = 5.95{{nbsp}}mm.
    • The drill sizes that are near this are {{frac|15|64}}{{nbsp}}in (85%), 6.0 mm (85.7%), and 6.1 mm (87.1%); any of these will work well.
    • Example (metric, fine): For M7.0×0.5, 7.0{{nbsp}}mm × 0.90 = 6.30.
    • The drill sizes that are near this are 6.3 mm (90%), {{frac|1|4}}{{nbsp}}in (90.7%), 6.4 mm (91.4%), and 6.5 mm (92.9%); any of these will work well.
  • For metric V threads, major minus pitch yields a good tap drill diameter.
    • Example (metric, coarse): For M7.0 × 1.0, 7.0 − 1.0 = 6.0
    • Example (metric, fine): For M7.0 × 0.5, 7.0 − 0.5 = 6.5
    • (The 85% coarse, 90% fine guideline, within its effective range, matches this in net effect)
    • The major minus pitch also works for inch-based threads, but you must first determine the pitch by looking at the number of treads per inch (TPI; for example, {{frac|1|20}} = 0.050 and {{frac|1|13}} ≈ 0.077), and your result will only land near a tap drill size (not directly on one).
    • Example (inch coarse): For {{frac|7|16}}-14, 1{{nbsp}}in ÷ 14 = 0.071{{nbsp}}in; 0.437{{nbsp}}in − 0.071{{nbsp}}in = 0.366{{nbsp}}in;
    • The drill sizes that are near this are 9.3 mm (0.366{{nbsp}}in) and letter U (0.368{{nbsp}}in). In addition, 9.5 mm (0.374{{nbsp}}in), and {{frac|3|8}}{{nbsp}}in (0.375{{nbsp}}in) will work well, although major minus pitch by itself does not tell you this; but the 85% ± 2 pp guideline supports it.
    • Example (inch fine): For {{frac|7|16}}-20, 1{{nbsp}}in ÷ 20 = 0.050{{nbsp}}in; 0.437{{nbsp}}in − 0.050{{nbsp}}in = 0.387{{nbsp}}in;
    • The drill sizes that are near this are letter W (0.386{{nbsp}}in) and {{frac|25|64}}{{nbsp}}in (0.391{{nbsp}}in). In addition, 10 mm (0.393{{nbsp}}in), and letter X (0.397{{nbsp}}in) will work well, although major minus pitch by itself does not tell you this; but the 90% ± 2 pp guideline supports it.
  • For both of these rules of thumb (85%/90% and major minus pitch), the tap drill size yielded is not necessarily the only possible one, but it is a good one for general use.
    • Example (metric coarse): For M7.0×1.0, major minus pitch yields 6.0, but 6.1 also works well.
    • Example (metric fine): For M7.0×0.5, major minus pitch yields 6.5, which at 92.9% happens to be an example that pushes over the outer bound of the 90% ± 2 pp, but major minus pitch is still valid, although smaller drills (6.3 mm, {{frac|1|4}}, 6.4 mm) will work well.

Chart

{{Expand list|date=August 2008}}{{disputed|section|date=May 2012}}{{legend|#b4f0de|Inch-sized drills, increments of {{frac|1|64}} in.}}{{legend|#ffdead|Drills in the number (1–80) and letter (A–Z) series which are specified in decimal inches.}}{{legend|#f9f9f9|Standard metric drill sizes.}}{{legend|#ddddff|Standard metric drill sizes used for metric taps of the size indicated in the tap size column.}}
Drill bit diameter Fractional sizeDrill wire
 gauge[2][3]		Tap size[4][5][6]ClearanceThread
depth†[7][8] (%)		Outer
diameter
(mm, 4 d.p.) (in, 5 d.p.) (in) Close fit[9] Free fit[10]
0.0483 0.00190 107
0.0500 0.00197
0.0584 0.00230 106
0.0686 0.00270 105
0.0787 0.00310 104
0.0889 0.00350 103
0.0991 0.00390 102
0.1000 0.00394
0.1092 0.00430 101
0.1194 0.00470 100
0.1295 0.00510 99
0.1397 0.00550 98
0.1499 0.00590 97
0.1600 0.00630 96
0.1702 0.00670 95
0.1803 0.00710 94
0.1905 0.00750 93
0.2007 0.00790 92
0.2000 0.00787
0.2108 0.00830 91
0.2210 0.00870 90
0.2311 0.00910 89
0.2413 0.00950 88
0.2500 0.00984
0.2540 0.01000 87
0.2667 0.01050 86
0.2794 0.01100 85
0.2921 0.01150 84
0.3000 0.01181
0.3048 0.01200 83
0.3175 0.01250 82
0.3302 0.01300 81
0.3429 0.01350 80
0.3500 0.01378
0.3680 0.01449 79
0.3969 0.015631|64}} #0000-160‡ 0.02400{{nbsp}}in 0.021 in
0.4000 0.01575
0.4064 0.01600 78
0.4200 0.01654
0.4400 0.01732
0.4500 0.01772
0.4572 0.01800 77
0.4600 0.01811
0.4800 0.01890
0.5000 0.01969
0.5080 0.02000 76
0.5334 0.02100 75
0.5500 0.02165
0.5715 0.02250 74
0.6000 0.02362
0.6096 0.02400 73
0.6350 0.02500 72
0.6500 0.02559
0.6604 0.02600 71 #000-120‡ 0.03700{{nbsp}}in
0.7000 0.02756
0.7112 0.02800 70
0.7417 0.02920 69
0.7500 0.02953
0.7874 0.03100 68
0.7938 0.031251|32}}
0.8000 0.03150
0.8128 0.03200 67
0.8382 0.03300 66
0.8500 0.03346
0.8890 0.03500 65 #00-90‡ 0.05200{{nbsp}}in
0.9000 0.03543
0.9144 0.03600 64
0.9398 0.03700 63
0.9500 0.03740
0.9652 0.03800 62
0.9906 0.03900 61
1.0000 0.03937
1.0160 0.04000 60
1.0414 0.04100 59
1.0500 0.04134
1.0668 0.04200 58
1.0922 0.04300 57
1.1000 0.04331
1.1500 0.04528
1.1811 0.04650 56
1.1906 0.046883|64}} #0-80 0.06350{{nbsp}}in 0.07000{{nbsp}}in
1.2000 0.04724
1.2500 0.04921
1.3000 0.05118
1.3208 0.05200 55
1.3500 0.05315
1.3970 0.05500 54
1.4000 0.05512
1.4500 0.05709
1.5000 0.05906
1.5113 0.05950 53 #1-64, #1-72 0.07600{{nbsp}}in 0.08100{{nbsp}}in
1.5500 0.06102
1.5875 0.062501|16}}
1.6000 0.06299 M2×0.4 2.2{{nbsp}}mm
1.6129 0.06350 52
1.6500 0.06496
1.7000 0.06693
1.7018 0.06700 51 #2-56 0.08900{{nbsp}}in 0.09600{{nbsp}}in
1.7500 0.06890 M2.2×0.45 2.25{{nbsp}}mm
1.7780 0.07000 50 #2-56, #2-64 0.08900{{nbsp}}in 0.09600{{nbsp}}in
1.8000 0.07087
1.8500 0.07283
1.8542 0.07300 49
1.9000 0.07480
1.9304 0.07600 48
1.9500 0.07677
1.9600 0.07717 #3-48 0.10400{{nbsp}}in 0.11000{{nbsp}}in 81
1.9700 0.07756 #3-48 0.10400{{nbsp}}in 0.11000{{nbsp}}in 79
1.9844 0.078135|64}} #3-48 0.10400{{nbsp}}in 0.11000{{nbsp}}in 78
1.9939 0.07850 47 #3-48 0.10400{{nbsp}}in 0.11000{{nbsp}}in 76
2.0000 0.07874 #3-48 0.10400{{nbsp}}in 0.11000{{nbsp}}in 75
2.0100 0.07913 #3-48 0.10400{{nbsp}}in 0.11000{{nbsp}}in 74
2.0200 0.07953 #3-48 0.10400{{nbsp}}in 0.11000{{nbsp}}in 72
2.0300 0.07992 #3-48 0.10400{{nbsp}}in 0.11000{{nbsp}}in 71
2.0400 0.08031 #3-48
#3-56		 0.10400{{nbsp}}in 0.11000{{nbsp}}in 69
81
2.0500 0.08071 #3-48
#3-56
M2.5×0.45		 0.10400{{nbsp}}in
 		 0.11000{{nbsp}}in
 		 68
79
 
2.0574 0.08100 46 #3-48
#3-56		 0.10400{{nbsp}}in 0.11000{{nbsp}}in 66
77
2.0700 0.08150 #3-48
#3-56		 0.10400{{nbsp}}in 0.11000{{nbsp}}in 65
75
2.0828 0.08200 45 #3-48
#3-56		 0.10400{{nbsp}}in 0.11000{{nbsp}}in 66
74
2.0900 0.08228 #3-48
#3-56		 0.10400{{nbsp}}in 0.11000{{nbsp}}in 62
72
2.1000 0.08268 #3-48
#3-56		 0.10400{{nbsp}}in 0.11000{{nbsp}}in 60
70
2.1100 0.08307 #3-48
#3-56		 0.10400{{nbsp}}in 0.11000{{nbsp}}in 59
69
2.1200 0.08346 #3-56 0.10400{{nbsp}}in 0.11000{{nbsp}}in 67
2.1300 0.08386 #3-56 0.10400{{nbsp}}in 0.11000{{nbsp}}in 65
2.1400 0.08425 #3-56 0.10400{{nbsp}}in 0.11000{{nbsp}}in 63
2.1500 0.08465 #3-56
M2.5×0.35		 0.10400{{nbsp}}in 0.11000{{nbsp}}in 62
2.1600 0.08504 #3-56 0.10400{{nbsp}}in 0.11000{{nbsp}}in 60
2.1700 0.08543 #3-56 0.10400{{nbsp}}in 0.11000{{nbsp}}in 59
2.1844 0.08600 44 #4-36 0.11600{{nbsp}}in 0.12850{{nbsp}}in 81
2.1900 0.08622 #4-40 0.11600{{nbsp}}in 0.12850{{nbsp}}in 81
2.2000 0.08661 #4-40 0.11600{{nbsp}}in 0.12850{{nbsp}}in 78
2.2100 0.08701 #4-40 0.11600{{nbsp}}in 0.12850{{nbsp}}in 77
2.2200 0.08740 #4-40 0.11600{{nbsp}}in 0.12850{{nbsp}}in 76
2.2300 0.08780 #4-40 0.11600{{nbsp}}in 0.12850{{nbsp}}in 75
2.2400 0.08819 #4-40 0.11600{{nbsp}}in 0.12850{{nbsp}}in 73
2.2500 0.08858 #4-40 0.11600{{nbsp}}in 0.12850{{nbsp}}in 72
2.2600 0.08898 #4-40 0.11600{{nbsp}}in 0.12850{{nbsp}}in 71
2.2606 0.08900 43 #4-40 0.11600{{nbsp}}in 0.12850{{nbsp}}in 71
2.2700 0.08937 #4-40 0.11600{{nbsp}}in 0.12850{{nbsp}}in 70
2.2800 0.08976 #4-40 0.11600{{nbsp}}in 0.12850{{nbsp}}in 68
2.2900 0.09016 #4-40
#4-48		 0.11600{{nbsp}}in 0.12850{{nbsp}}in 67
81
2.3000 0.09055 #4-40
#4-48		 0.11600{{nbsp}}in 0.12850{{nbsp}}in 66
79
2.3100 0.09094 #4-40
#4-48		 0.11600{{nbsp}}in 0.12850{{nbsp}}in 65
78
2.3200 0.09134 #4-40
#4-48		 0.11600{{nbsp}}in 0.12850{{nbsp}}in 64
76
2.3300 0.09173 #4-40
#4-48		 0.11600{{nbsp}}in 0.12850{{nbsp}}in 63
75
2.3400 0.09213 #4-40
#4-48		 0.11600{{nbsp}}in 0.12850{{nbsp}}in 61
74
2.3500 0.09252 #4-40
#4-48		 0.11600{{nbsp}}in 0.12850{{nbsp}}in 60
72
2.3749 0.09350 42 #4-48 0.11600{{nbsp}}in 0.12850{{nbsp}}in 69
2.3813 0.093753|32}}
2.4000 0.09449
2.4384 0.09600 41
2.4500 0.09646
2.4892 0.09800 40
2.5000 0.09843 M3×0.5 3.2{{nbsp}}mm 75
2.5273 0.09950 39 #5-40 0.12850{{nbsp}}in 0.13600{{nbsp}}in 78
2.5781 0.10150 38 #5-40 0.12850{{nbsp}}in 0.13600{{nbsp}}in 72
2.6000 0.10236
2.6416 0.10400 37 #5-44 0.12850{{nbsp}}in 0.13600{{nbsp}}in 71
2.7000 0.10630
2.7051 0.10650 36 #6-32 0.14400{{nbsp}}in 0.14950{{nbsp}}in 77 0.14{{nbsp}}in
2.7500 0.10827
2.7781 0.109387|64}}
2.7940 0.11000 35
2.8000 0.11024
2.8194 0.11100 34
2.8702 0.11300 33 #6-40 0.1563{{nbsp}}in 0.14{{nbsp}}in
2.9000 0.11417 M3.5×0.6
2.9464 0.11600 32
3.0000 0.11811
3.0480 0.12000 31
3.1000 0.12205
3.1750 0.125001|8}}
3.2000 0.12598
3.2500 0.12795
3.2639 0.12850 30
3.3000 0.12992 M4×0.7 4.10{{nbsp}}mm 75
3.4000 0.13386
3.4544 0.13600 29 #8-32 0.16950{{nbsp}}in 0.17700{{nbsp}}in 69
3.5000 0.13780 M4×0.5 4.10{{nbsp}}mm 60
3.5687 0.14050 28
3.5719 0.140639|64}}
3.6000 0.14173
3.6576 0.14400 27
3.7000 0.14567
3.7338 0.14700 26
3.7500 0.14764
3.7973 0.14950 25 #10-24 0.19600{{nbsp}}in 0.20100{{nbsp}}in 75
3.8000 0.14961
3.8608 0.15200 24
3.9000 0.15354
3.9116 0.15400 23
3.9688 0.156255|32}}
3.9878 0.15700 22
4.0000 0.15748
4.0386 0.15900 21 #10-32 0.1960{{nbsp}}in 0.2010{{nbsp}}in
4.0894 0.16100 20
4.1000 0.16142
4.2000 0.16535 M5×0.8 5.10{{nbsp}}mm 75
4.2164 0.16600 19
4.2500 0.16732
4.3053 0.16950 18
4.3656 0.1718811|64}}
4.3942 0.17300 17
4.4000 0.17323
4.4958 0.17700 16 #12-24 0.22100{{nbsp}}in 0.22800{{nbsp}}in 72
4.5000 0.17717
4.5720 0.18000 15
4.6000 0.18110
4.6228 0.18200 14
4.6990 0.18500 13
4.7000 0.18504
4.7500 0.18701
4.7625 0.187503|16}}
4.8000 0.18898
4.8006 0.18900 12
4.8514 0.19100 11
4.9000 0.19291
4.9149 0.19350 10
4.9784 0.19600 9
5.0000 0.19685 M6×1.0 6.10{{nbsp}}mm 75
5.0546 0.19900 8
5.1000 0.20079
5.1054 0.20100 71|4}}-20 0.25700{{nbsp}}in 0.26600{{nbsp}}in 72
5.1594 0.2031313|64}}
5.1816 0.20400 6
5.2000 0.20472 M6×0.75 [11] 6.10{{nbsp}}mm 60
5.2197 0.20550 5
5.2500 0.20669
5.3000 0.20866
5.3086 0.20900 4
5.4000 0.21260
5.4102 0.21300 31|4}}-28 0.25700{{nbsp}}in 0.26600{{nbsp}}in 80
5.5000 0.216541|4}}-28 0.25700{{nbsp}}in 0.26600{{nbsp}}in 70
5.5563 0.218757|32}}1|4}}-28
{{frac|1|4}}-32
({{frac|1|4}}-32 UNEF for glow plugs)		 0.25700{{nbsp}}in 0.26600{{nbsp}}in 68
5.6000 0.220471|4}}-28 0.25700{{nbsp}}in 0.26600{{nbsp}}in 63
5.6134 0.22100 21|4}}-28 0.25700{{nbsp}}in 0.26600{{nbsp}}in 60
5.7000 0.22441
5.7500 0.22638
5.7912 0.22800 1
5.8000 0.22835
5.9000 0.23228
5.9436 0.23400 A
5.9531 0.2343815|64}}
6.0000 0.23622
6.0452 0.23800 B
6.1000 0.24016 M7×1.0 75
6.1468 0.24200 C
6.2000 0.24409
6.2484 0.24600 D
6.2500 0.24606
6.3000 0.24803
6.35000.250001|4}}
E
6.4000 0.25197
6.5000 0.25591M7×0.5
6.5278 0.25700 F5|16}}-18 0.32300{{nbsp}}in 0.33200{{nbsp}}in 77
6.6000 0.25984
6.6294 0.26100 G
6.7000 0.26378
6.7469 0.2656317|64}}5|16}}-18 74
6.7500 0.26575
6.7564 0.26600 H
6.8000 0.26772
6.9000 0.27165 M8×1.25 75
6.9088 0.27200 I5|16}}-24 0.32300{{nbsp}}in 0.33200{{nbsp}}in 75
7.0000 0.27559
7.0358 0.27700 J5|16}}-18 50
7.1000 0.27953 M8×1.0 75
7.1374 0.28100 K
7.1438 0.281259|32}}5|16}}-32
7.2000 0.28346
7.2500 0.28543
7.3000 0.28740
7.3660 0.29000 L
7.4000 0.29134
7.4930 0.29500 M
7.5000 0.29528
7.5406 0.2968819|64}}
7.6000 0.29921
7.6708 0.30200 N
7.7000 0.30315
7.7500 0.30512
7.8000 0.30709
7.9000 0.31102
7.9375 0.312505|16}}3|8}}-16 0.38600{{nbsp}}in 0.39700{{nbsp}}in 77
8.0000 0.31496
8.0264 0.31600 O
8.1000 0.31890
8.2000 0.32283
8.2042 0.32300 P
8.2500 0.32480
8.3000 0.32677
8.3344 0.3281321|64}}
8.4000 0.33071
8.4328 0.33200 Q3|8}}-24 0.38600{{nbsp}}in 0.39700{{nbsp}}in 79
8.5000 0.33465 M10×1.5
8.6000 0.33858
8.6106 0.33900 R
8.7000 0.34252
8.7313 0.3437511|32}}
8.7500 0.34449 M10×1.25
8.8000 0.34646
8.8392 0.34800 S
8.9000 0.35039
9.0000 0.35433 M10×1.0
(spark plug)
9.0932 0.35800 T
9.1000 0.35827
9.1281 0.3593823|64}}
9.2000 0.36220
9.2500 0.36417
9.3000 0.36614
9.3472 0.36800 U7|16}}-14 0.45310{{nbsp}}in 0.46870{{nbsp}}in 75
9.4000 0.37008
9.5000 0.37402
9.5250 0.375003|8}}
9.5758 0.37700 V
9.6000 0.37795
9.7000 0.38189
9.7500 0.38386
9.8000 0.38583
9.8044 0.38600 W
9.9000 0.38976
9.9219 0.3906325|64}}7|16}}-20 0.45313{{nbsp}}in 0.46785{{nbsp}}in 72
10.0000 0.39370
10.0838 0.39700 X
10.2616 0.40400 Y
10.3188 0.4062513|32}}7|16}}-40
10.4902 0.41300 Z
10.5000 0.41339 M12×1.75 75
10.7000 0.42126 M12×1.5 75
10.7156 0.4218827|64}}1|2}}-13 0.51563{{nbsp}}in 0.53125{{nbsp}}in 78
10.900 0.42913 M12×1.25
(spark plug)
11.0000 0.43307
11.1125 0.437507|16}}
11.5000 0.45276
11.5094 0.4531329|64}}1|2}}-20 0.51563{{nbsp}}in 0.53125{{nbsp}}in 72
11.9063 0.4687515|32}}9|16}}-12 0.56250{{nbsp}}in 87
12.0000 0.47244
12.2000 0.48031 M14×2 75
12.3031 0.4843831|64}}9|16}}-12 0.56250{{nbsp}}in 68
12.5000 0.49213
12.70000.500001|2}}9|16}}-18 0.56250{{nbsp}}in 87
M14×1.5 75
12.8000 0.50393 M14×1.25
(spark plug)
13.0000 0.51181
13.0969 0.5156333|64}}9|16}}-18 0.56250{{nbsp}}in 65
13.4938 0.5312517|32}}5|8}}-11 0.62500{{nbsp}}in 79
13.5000 0.53150
13.8906 0.5468835|64}}5|8}}-11 0.62500{{nbsp}}in 66
14.0000 0.55118
14.2000 0.55906 M16×2 75
14.2875 0.562509|16}}5|8}}-18 0.62500{{nbsp}}in 87
14.5000 0.57087
14.6844 0.5781337|64}}5|8}}-18 0.62500{{nbsp}}in 65
14.7000 0.57874 M16×1.5 75
15.0000 0.59055
15.0813 0.5937519|32}}
15.4781 0.6093839|64}}
15.5000 0.61024
15.8750 0.625005|8}}
16.0000 0.62992
16.2719 0.6406341|64}}3|4}}-10 84
16.5000 0.64961
16.6688 0.6562521|32}}3|4}}-10 72
16.8000 0.66141 M18×1.5
(spark plug)
17.0000 0.66929
17.0656 0.6718843|64}}
17.4625 0.6875011|16}}3|4}}-16 77
17.5000 0.68898
17.8594 0.7031345|64}}
18.0000 0.70866
18.2563 0.7187523|32}}
18.5000 0.72835
18.6531 0.7343847|64}}
19.0000 0.74803
19.0500 0.750003|4}}
19.4469 0.7656349|64}}7|8}}-9 76
19.5000 0.76772
19.8438 0.7812525|32}}7|8}}-9 65
20.0000 0.78740
20.2406 0.7968851|64}}7|8}}-14 84
20.5000 0.80709
20.6375 0.8125013|16}}7|8}}-14 67
21.0000 0.82677
21.0344 0.8281353|64}}7|8}}-18 NS
(spark plug)
21.4313 0.8437527|32}}
21.5000 0.84646
21.8281 0.8593855|64}} 1-8 87
22.0000 0.86614
22.2250 0.875007|8}} 1-8 77
22.5000 0.88583
22.6219 0.8906357|64}} 1-8 67
23.0000 0.90551
23.0188 0.9062529|32}} 1-12 87
23.41560.9218859|64}} 1-12
1-14		 72
84
23.5000 0.92520
23.8125 0.9375015|16}} 1-14 67
24.0000 0.94488
24.2094 0.9531361|64}}
24.5000 0.96457
24.6063 0.9687531|32}}1|1|8}}-7 84
25.0000 0.98425
25.0031 0.9843863|64}}1|1|8}}-7 76
25.4000 1.00000 11|1|8}}-7 67
25.5000 1.00394
25.7969 1.015631|1|64}}
26.0000 1.02362
26.1938 1.031251|1|32}}1|1|8}}-12 87
26.5000 1.04331
26.5906 1.046881|3|64}}1|1|8}}-12 72
26.9875 1.062501|1|16}}
27.0000 1.06299
27.5000 1.08268
28.0000 1.10236
28.1781 1.109381|7|64}}1|1|4}}-7 76
28.5000 1.12205
28.5750 1.125001|1|8}}1|1|4}}-7 67
29.0000 1.14173
29.3688 1.156251|5|32}}1|1|4}}-12 87
29.5000 1.16142
29.7656 1.171881|11|64}}1|1|4}}-12 72
30.0000 1.18110
30.1625 1.187501|3|16}}1|3|8}}-6 87
30.5000 1.20079
30.5594 1.203131|13|64}}1|3|8}}-6 79
30.9563 1.218751|7|32}}1|3|8}}-6 72
31.0000 1.22047
31.3531 1.234381|15|64}}1|3|8}}-6 65
31.5000 1.24016
32.0000 1.25984
32.5000 1.27953
32.5438 1.281251|9|32}}1|3|8}}-12 87
32.9406 1.296881|19|64}}1|3|8}}-12 72
33.0000 1.29921
33.3375 1.312501|5|16}}1|1|2}}-6 87
33.5000 1.31890
33.7344 1.328131|21|64}}1|1|2}}-6 79
34.0000 1.33858
34.1313 1.343751|11|32}}1|1|2}}-6 72
34.5000 1.35827
34.5281 1.359381|23|64}}1|1|2}}-6 65
35.0000 1.37795
35.5000 1.39764
35.7188 1.406251|13|32}}1|1|2}}-12 87
36.0000 1.41732
36.1156 1.421881|27|64}}1|1|2}}-12 72
36.5000 1.43701
†If theoretical thread percentage not given, assume 75% ± 10%
  Theoretical percentage of thread should not be relied upon for threads of included angles other than 60 degrees.

‡See http://www.newmantools.com/taps/micro.htm for more information.

See also

{{div col|colwidth=30em}}
  • AN thread
  • British standard pipe thread
  • British Association screw threads
  • British Standard Whitworth
  • Drill bit sizes, a similar page including center drill sizes
  • ISO metric screw thread
  • National pipe thread
  • Taps and dies
  • United States Standard thread
  • Unified Thread Standard
{{div col end}}

References

1. ^{{cite web|url=http://www.bpowertools.com/drill-bit-sizes/ |title=Drill Bit Size Charts and Rule of Thumb}}
2. ^{{cite web|url=http://www.madison.k12.wi.us/toki/codrills.htm |title=Continuous Drill Bit Sizes |accessdate=2006-08-29 |archiveurl=https://web.archive.org/web/20060719084558/http://www.madison.k12.wi.us/toki/codrills.htm |archivedate=2006-07-19 |deadurl=yes |df= }}
3. ^{{cite web|url=http://www.physics.ohio-state.edu/~kelch/decimal.html |title=Decimal Equivalents |work=Ohio State University |accessdate=2006-08-29 |archiveurl=https://web.archive.org/web/20060902095350/http://www.physics.ohio-state.edu/~kelch/decimal.html |archivedate=2006-09-02 |deadurl=yes |df= }}
4. ^{{cite web|url=http://www.newmantools.com/tapdrill.htm|title= Tap Drill Sizes and Calculator|work = newmantools.com|accessdate=2006-08-04}}
5. ^{{cite web|url=http://www.precisiontwistdrill.com/techhelp/help_pages/unified_metric_tap_sizes.asp|title=Tap Drill Sizes for Universal and M-Profile Screw Threads|work =precisiontwistdrill.com|accessdate = 2006-08-04}}
6. ^{{cite web|url=http://www.sizes.com/tools/thread_NCNF.htm|title=NC, NF, NEF to one inch in diameter|work=Sizes.com|accessdate=2006-09-01|deadurl=yes|archiveurl=https://web.archive.org/web/20060929162504/http://www.sizes.com/tools/thread_NCNF.htm|archivedate=2006-09-29|df=}}
7. ^{{cite web|url=http://www.guhring.com/Documents/Catalog/Taps/Taps.pdf|title=High performance taps |publisher = guhring.com|accessdate = 2010-10-07}}
8. ^{{cite web|url=http://www.widell.com/drillsiz.html|title=Tap Drill Sizes|work=widell.com|accessdate=2006-09-01|deadurl=yes|archiveurl=https://web.archive.org/web/20061114071651/http://www.widell.com/drillsiz.html|archivedate=2006-11-14|df=}}
9. ^{{cite web|url=http://www.smallparts.com/products/descriptions/Tap+&+Clearance+Drills+Chart.cfm |title=Tap & Clearance Drills For Common Screws|work =Small Parts Inc.|accessdate = 2010-10-07 }}{{dead link|date=September 2016|bot=medic}}{{cbignore|bot=medic}}
10. ^{{cite web|url=http://www.efunda.com/designstandards/screws/tapdrill.cfm|title=Tap Drill Sizes|work =efunda.com|accessdate = 2006-08-04}}
11. ^http://www.littlemachineshop.com/reference/tapdrillsizes.pdf

External links

  • Tap Drill Sizes
  • Metric Tap Drill Sizes
  • Tap and drill chart
  • [https://web.archive.org/web/20120320164025/http://www.unisig.com/gundrilling-education/bta-drill-tube-reference.pdf BTA Drill Tube Reference Chart]
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