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Below is a comprehensive drill and tap size chart for all drills and taps, imperial and metric, up to 36.5 millimetres (1.44 in) 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.
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:
Below, these guidelines are explored with examples.
This article's factual accuracy is disputed. (May 2012) |
Drill bit diameter | Fractional size | Drill wire gauge[2][3] |
Tap size[4][5][6] | Clearance | Thread 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 | |||||||
Drill bit diameter | Fractional size | Drill wire gauge[2][3] |
Tap size[4][5][6] | Clearance | Thread depth†[11][8] (%) |
Outer diameter | ||
(mm, 4 d.p.) | (in, 5 d.p.) | (in) | Close fit[9] | Free fit[10] | ||||
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 | 0.01563 | 1⁄64 | #0000-160‡ | 0.02400 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 | |||||||
Drill bit diameter | Fractional size | Drill wire gauge[2][3] |
Tap size[4][5][6] | Clearance | Thread depth†[12][8] (%) |
Outer diameter | ||
(mm, 4 d.p.) | (in, 5 d.p.) | (in) | Close fit[9] | Free fit[10] | ||||
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 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 | 0.03125 | 1⁄32 | ||||||
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 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 | ||||||
Drill bit diameter | Fractional size | Drill wire gauge[2][3] |
Tap size[4][5][6] | Clearance | Thread depth†[13][8] (%) |
Outer diameter | ||
(mm, 4 d.p.) | (in, 5 d.p.) | (in) | Close fit[9] | Free fit[10] | ||||
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 | 0.04688 | 3⁄64 | #0-80 | 0.06350 in | 0.07000 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 in | 0.08100 in | |||
1.5500 | 0.06102 | |||||||
1.5875 | 0.06250 | 1⁄16 | ||||||
1.6000 | 0.06299 | M2×0.4 | 2.2 mm | |||||
1.6129 | 0.06350 | 52 | ||||||
1.6500 | 0.06496 | |||||||
1.7000 | 0.06693 | |||||||
1.7018 | 0.06700 | 51 | #2-56 | 0.08900 in | 0.09600 in | |||
1.7500 | 0.06890 | M2.2×0.45 | 2.25 mm | |||||
Drill bit diameter | Fractional size | Drill wire gauge[2][3] |
Tap size[4][5][6] | Clearance | Thread depth†[14][8] (%) |
Outer diameter | ||
(mm, 4 d.p.) | (in, 5 d.p.) | (in) | Close fit[9] | Free fit[10] | ||||
1.7780 | 0.07000 | 50 | #2-56, #2-64 | 0.08900 in | 0.09600 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 in | 0.11000 in | 81 | |||
1.9700 | 0.07756 | #3-48 | 0.10400 in | 0.11000 in | 79 | |||
1.9844 | 0.07813 | 5⁄64 | #3-48 | 0.10400 in | 0.11000 in | 78 | ||
1.9939 | 0.07850 | 47 | #3-48 | 0.10400 in | 0.11000 in | 76 | ||
2.0000 | 0.07874 | #3-48 | 0.10400 in | 0.11000 in | 75 | |||
2.0100 | 0.07913 | #3-48 | 0.10400 in | 0.11000 in | 74 | |||
2.0200 | 0.07953 | #3-48 | 0.10400 in | 0.11000 in | 72 | |||
2.0300 | 0.07992 | #3-48 | 0.10400 in | 0.11000 in | 71 | |||
2.0400 | 0.08031 | #3-48 #3-56 |
0.10400 in | 0.11000 in | 69 81 |
|||
2.0500 | 0.08071 | #3-48 #3-56 M2.5×0.45 |
0.10400 in |
0.11000 in |
68 79 |
|||
2.0574 | 0.08100 | 46 | #3-48 #3-56 |
0.10400 in | 0.11000 in | 66 77 |
||
2.0700 | 0.08150 | #3-48 #3-56 |
0.10400 in | 0.11000 in | 65 75 |
|||
2.0828 | 0.08200 | 45 | #3-48 #3-56 |
0.10400 in | 0.11000 in | 66 74 |
||
2.0900 | 0.08228 | #3-48 #3-56 |
0.10400 in | 0.11000 in | 62 72 |
|||
2.1000 | 0.08268 | #3-48 #3-56 |
0.10400 in | 0.11000 in | 60 70 |
|||
2.1100 | 0.08307 | #3-48 #3-56 |
0.10400 in | 0.11000 in | 59 69 |
|||
2.1200 | 0.08346 | #3-56 | 0.10400 in | 0.11000 in | 67 | |||
2.1300 | 0.08386 | #3-56 | 0.10400 in | 0.11000 in | 65 | |||
2.1400 | 0.08425 | #3-56 | 0.10400 in | 0.11000 in | 63 | |||
2.1500 | 0.08465 | #3-56 M2.5×0.35 |
0.10400 in | 0.11000 in | 62 | |||
2.1600 | 0.08504 | #3-56 | 0.10400 in | 0.11000 in | 60 | |||
2.1700 | 0.08543 | #3-56 | 0.10400 in | 0.11000 in | 59 | |||
2.1844 | 0.08600 | 44 | #4-36 | 0.11600 in | 0.12850 in | 81 | ||
2.1900 | 0.08622 | #4-40 | 0.11600 in | 0.12850 in | 81 | |||
2.2000 | 0.08661 | #4-40 | 0.11600 in | 0.12850 in | 78 | |||
2.2100 | 0.08701 | #4-40 | 0.11600 in | 0.12850 in | 77 | |||
2.2200 | 0.08740 | #4-40 | 0.11600 in | 0.12850 in | 76 | |||
2.2300 | 0.08780 | #4-40 | 0.11600 in | 0.12850 in | 75 | |||
2.2400 | 0.08819 | #4-40 | 0.11600 in | 0.12850 in | 73 | |||
2.2500 | 0.08858 | #4-40 | 0.11600 in | 0.12850 in | 72 | |||
2.2600 | 0.08898 | #4-40 | 0.11600 in | 0.12850 in | 71 | |||
2.2606 | 0.08900 | 43 | #4-40 | 0.11600 in | 0.12850 in | 71 | ||
2.2700 | 0.08937 | #4-40 | 0.11600 in | 0.12850 in | 70 | |||
2.2800 | 0.08976 | #4-40 | 0.11600 in | 0.12850 in | 68 | |||
2.2900 | 0.09016 | #4-40 #4-48 |
0.11600 in | 0.12850 in | 67 81 |
|||
2.3000 | 0.09055 | #4-40 #4-48 |
0.11600 in | 0.12850 in | 66 79 |
|||
2.3100 | 0.09094 | #4-40 #4-48 |
0.11600 in | 0.12850 in | 65 78 |
|||
2.3200 | 0.09134 | #4-40 #4-48 |
0.11600 in | 0.12850 in | 64 76 |
|||
2.3300 | 0.09173 | #4-40 #4-48 |
0.11600 in | 0.12850 in | 63 75 |
|||
2.3400 | 0.09213 | #4-40 #4-48 |
0.11600 in | 0.12850 in | 61 74 |
|||
2.3500 | 0.09252 | #4-40 #4-48 |
0.11600 in | 0.12850 in | 60 72 |
|||
2.3749 | 0.09350 | 42 | #4-48 | 0.11600 in | 0.12850 in | 69 | ||
2.3813 | 0.09375 | 3⁄32 | ||||||
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 mm | 75 | ||||
2.5273 | 0.09950 | 39 | #5-40 | 0.12850 in | 0.13600 in | 78 | ||
2.5781 | 0.10150 | 38 | #5-40 | 0.12850 in | 0.13600 in | 72 | ||
2.6000 | 0.10236 | |||||||
2.6416 | 0.10400 | 37 | #5-44 | 0.12850 in | 0.13600 in | 71 | ||
2.7000 | 0.10630 | |||||||
2.7051 | 0.10650 | 36 | #6-32 | 0.14400 in | 0.14950 in | 77 | 0.14 in | |
2.7500 | 0.10827 | |||||||
2.7781 | 0.10938 | 7⁄64 | ||||||
2.7940 | 0.11000 | 35 | ||||||
2.8000 | 0.11024 | |||||||
2.8194 | 0.11100 | 34 | ||||||
2.8702 | 0.11300 | 33 | #6-40 | 0.1563 in | 0.14 in | |||
2.9000 | 0.11417 | M3.5×0.6 | ||||||
2.9464 | 0.11600 | 32 | ||||||
3.0000 | 0.11811 | |||||||
3.0480 | 0.12000 | 31 | #6-48 | |||||
3.1000 | 0.12205 | |||||||
3.1750 | 0.12500 | 1⁄8 | ||||||
3.2000 | 0.12598 | |||||||
3.2500 | 0.12795 | |||||||
3.2639 | 0.12850 | 30 | ||||||
3.3000 | 0.12992 | M4×0.7 | 4.10 mm | 75 | ||||
3.4000 | 0.13386 | |||||||
3.4544 | 0.13600 | 29 | #8-32, #8-36 | 0.16950 in | 0.17700 in | 69 | ||
3.5000 | 0.13780 | M4×0.5 | 4.10 mm | 60 | ||||
3.5687 | 0.14050 | 28 | #8-40 | |||||
3.5719 | 0.14063 | 9⁄64 | ||||||
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 in | 0.20100 in | 75 | ||
3.8000 | 0.14961 | |||||||
3.8608 | 0.15200 | 24 | ||||||
3.9000 | 0.15354 | |||||||
3.9116 | 0.15400 | 23 | ||||||
3.9688 | 0.15625 | 5⁄32 | ||||||
3.9878 | 0.15700 | 22 | ||||||
4.0000 | 0.15748 | |||||||
4.0386 | 0.15900 | 21 | #10-32 | 0.1960 in | 0.2010 in | |||
4.0894 | 0.16100 | 20 | ||||||
4.1000 | 0.16142 | |||||||
4.2000 | 0.16535 | M5×0.8 | 5.10 mm | 75 | ||||
4.2164 | 0.16600 | 19 | ||||||
4.2500 | 0.16732 | |||||||
4.3053 | 0.16950 | 18 | ||||||
4.3656 | 0.17188 | 11⁄64 | ||||||
4.3942 | 0.17300 | 17 | ||||||
4.4000 | 0.17323 | |||||||
4.4958 | 0.17700 | 16 | #12-24 | 0.22100 in | 0.22800 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 | 0.18750 | 3⁄16 | ||||||
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 mm | 75 | ||||
5.0546 | 0.19900 | 8 | ||||||
5.1000 | 0.20079 | |||||||
5.1054 | 0.20100 | 7 | 1⁄4-20 | 0.25700 in | 0.26600 in | 72 | ||
5.1594 | 0.20313 | 13⁄64 | ||||||
5.1816 | 0.20400 | 6 | ||||||
5.2000 | 0.20472 | M6×0.75 [15] | 6.10 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 | 3 | 1⁄4-28 | 0.25700 in | 0.26600 in | 80 | ||
5.5000 | 0.21654 | 1⁄4-28 | 0.25700 in | 0.26600 in | 70 | |||
5.5563 | 0.21875 | 7⁄32 | 1⁄4-28 1⁄4-32 (1⁄4-32 UNEF for glow plugs) |
0.25700 in | 0.26600 in | 68 | ||
5.6000 | 0.22047 | 1⁄4-28 | 0.25700 in | 0.26600 in | 63 | |||
5.6134 | 0.22100 | 2 | 1⁄4-28 | 0.25700 in | 0.26600 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 | 0.23438 | 15⁄64 | ||||||
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 | |||||||
6.3500 | 0.25000 | 1⁄4 | ||||||
6.4000 | 0.25197 | |||||||
6.5000 | 0.25591 | M7×0.5 | ||||||
6.5278 | 0.25700 | F | 5⁄16-18 | 0.32300 in | 0.33200 in | 77 | ||
6.6000 | 0.25984 | |||||||
6.6294 | 0.26100 | G | ||||||
6.7000 | 0.26378 | |||||||
6.7469 | 0.26563 | 17⁄64 | 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 | I | 5⁄16-24 | 0.32300 in | 0.33200 in | 75 | ||
7.0000 | 0.27559 | |||||||
7.0358 | 0.27700 | J | 5⁄16-18 | 50 | ||||
7.1000 | 0.27953 | M8×1.0 | 75 | |||||
7.1374 | 0.28100 | K | ||||||
7.1438 | 0.28125 | 9⁄32 | 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 | 0.29688 | 19⁄64 | ||||||
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 | 0.31250 | 5⁄16 | 3⁄8-16 | 0.38600 in | 0.39700 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 | 0.32813 | 21⁄64 | ||||||
8.4000 | 0.33071 | |||||||
8.4328 | 0.33200 | Q | 3⁄8-24 | 0.38600 in | 0.39700 in | 79 | ||
8.5000 | 0.33465 | M10×1.5 | ||||||
8.6000 | 0.33858 | |||||||
8.6106 | 0.33900 | R | ||||||
8.7000 | 0.34252 | |||||||
8.7313 | 0.34375 | 11⁄32 | ||||||
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 | 0.35938 | 23⁄64 | ||||||
9.2000 | 0.36220 | |||||||
9.2500 | 0.36417 | |||||||
9.3000 | 0.36614 | |||||||
9.3472 | 0.36800 | U | 7⁄16-14 | 0.45310 in | 0.46870 in | 75 | ||
9.4000 | 0.37008 | |||||||
9.5000 | 0.37402 | |||||||
9.5250 | 0.37500 | 3⁄8 | ||||||
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 | 0.39063 | 25⁄64 | 7⁄16-20 | 0.45313 in | 0.46785 in | 72 | ||
10.0000 | 0.39370 | |||||||
10.0838 | 0.39700 | X | ||||||
10.2616 | 0.40400 | Y | ||||||
10.3188 | 0.40625 | 13⁄32 | 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 | 0.42188 | 27⁄64 | 1⁄2-13 | 0.51563 in | 0.53125 in | 78 | ||
10.900 | 0.42913 | M12×1.25 (spark plug) |
||||||
11.0000 | 0.43307 | |||||||
11.1125 | 0.43750 | 7⁄16 | ||||||
11.5000 | 0.45276 | |||||||
11.5094 | 0.45313 | 29⁄64 | 1⁄2-20 | 0.51563 in | 0.53125 in | 72 | ||
11.9063 | 0.46875 | 15⁄32 | 9⁄16-12 | 0.56250 in | 87 | |||
12.0000 | 0.47244 | |||||||
12.2000 | 0.48031 | M14×2 | 75 | |||||
12.3031 | 0.48438 | 31⁄64 | 9⁄16-12 | 0.56250 in | 68 | |||
12.5000 | 0.49213 | |||||||
12.7000 | 0.50000 | 1⁄2 | 9⁄16-18 | 0.56250 in | 87 | |||
12.8000 | 0.50393 | M14×1.25 (spark plug) |
||||||
13.0000 | 0.51181 | |||||||
13.0969 | 0.51563 | 33⁄64 | 9⁄16-18 | 0.56250 in | 65 | |||
13.4938 | 0.53125 | 17⁄32 | 5⁄8-11 | 0.62500 in | 79 | |||
13.5000 | 0.53150 | |||||||
13.8906 | 0.54688 | 35⁄64 | 5⁄8-11 | 0.62500 in | 66 | |||
14.0000 | 0.55118 | |||||||
14.2000 | 0.55906 | M16×2 | 75 | |||||
14.2875 | 0.56250 | 9⁄16 | 5⁄8-18 | 0.62500 in | 87 | |||
14.5000 | 0.57087 | |||||||
14.6844 | 0.57813 | 37⁄64 | 5⁄8-18 | 0.62500 in | 65 | |||
14.7000 | 0.57874 | M16×1.5 | 75 | |||||
15.0000 | 0.59055 | |||||||
15.0813 | 0.59375 | 19⁄32 | ||||||
15.4781 | 0.60938 | 39⁄64 | ||||||
15.5000 | 0.61024 | |||||||
15.8750 | 0.62500 | 5⁄8 | ||||||
16.0000 | 0.62992 | |||||||
16.2719 | 0.64063 | 41⁄64 | 3⁄4-10 | 84 | ||||
16.5000 | 0.64961 | |||||||
16.6688 | 0.65625 | 21⁄32 | 3⁄4-10 | 72 | ||||
16.8000 | 0.66141 | M18×1.5 (spark plug) |
||||||
17.0000 | 0.66929 | |||||||
17.0656 | 0.67188 | 43⁄64 | ||||||
17.4625 | 0.68750 | 11⁄16 | 3⁄4-16 | 77 | ||||
17.5000 | 0.68898 | |||||||
17.8594 | 0.70313 | 45⁄64 | ||||||
18.0000 | 0.70866 | |||||||
18.2563 | 0.71875 | 23⁄32 | ||||||
18.5000 | 0.72835 | |||||||
18.6531 | 0.73438 | 47⁄64 | ||||||
19.0000 | 0.74803 | |||||||
19.0500 | 0.75000 | 3⁄4 | ||||||
19.4469 | 0.76563 | 49⁄64 | 7⁄8-9 | 76 | ||||
19.5000 | 0.76772 | |||||||
19.8438 | 0.78125 | 25⁄32 | 7⁄8-9 | 65 | ||||
20.0000 | 0.78740 | |||||||
20.2406 | 0.79688 | 51⁄64 | 7⁄8-14 | 84 | ||||
20.5000 | 0.80709 | |||||||
20.6375 | 0.81250 | 13⁄16 | 7⁄8-14 | 67 | ||||
21.0000 | 0.82677 | |||||||
21.0344 | 0.82813 | 53⁄64 | 7⁄8-18 NS (spark plug) |
|||||
21.4313 | 0.84375 | 27⁄32 | ||||||
21.5000 | 0.84646 | |||||||
21.8281 | 0.85938 | 55⁄64 | 1-8 | 87 | ||||
22.0000 | 0.86614 | |||||||
22.2250 | 0.87500 | 7⁄8 | 1-8 | 77 | ||||
22.5000 | 0.88583 | |||||||
22.6219 | 0.89063 | 57⁄64 | 1-8 | 67 | ||||
23.0000 | 0.90551 | |||||||
23.0188 | 0.90625 | 29⁄32 | 1-12 | 87 | ||||
23.4156 | 0.92188 | 59⁄64 | 1-12 1-14 |
72 84 |
||||
23.5000 | 0.92520 | |||||||
23.8125 | 0.93750 | 15⁄16 | 1-14 | 67 | ||||
24.0000 | 0.94488 | |||||||
24.2094 | 0.95313 | 61⁄64 | ||||||
24.5000 | 0.96457 | |||||||
24.6063 | 0.96875 | 31⁄32 | 1+1⁄8-7 | 84 | ||||
25.0000 | 0.98425 | |||||||
25.0031 | 0.98438 | 63⁄64 | 1+1⁄8-7 | 76 | ||||
25.4000 | 1.00000 | 1 | 1+1⁄8-7 | 67 | ||||
25.5000 | 1.00394 | |||||||
25.7969 | 1.01563 | 1+1⁄64 | ||||||
26.0000 | 1.02362 | |||||||
26.1938 | 1.03125 | 1+1⁄32 | 1+1⁄8-12 | 87 | ||||
26.5000 | 1.04331 | |||||||
26.5906 | 1.04688 | 1+3⁄64 | 1+1⁄8-12 | 72 | ||||
26.9875 | 1.06250 | 1+1⁄16 | ||||||
27.0000 | 1.06299 | |||||||
27.5000 | 1.08268 | |||||||
28.0000 | 1.10236 | |||||||
28.1781 | 1.10938 | 1+7⁄64 | 1+1⁄4-7 | 76 | ||||
28.5000 | 1.12205 | |||||||
28.5750 | 1.12500 | 1+1⁄8 | 1+1⁄4-7 | 67 | ||||
29.0000 | 1.14173 | |||||||
29.3688 | 1.15625 | 1+5⁄32 | 1+1⁄4-12 | 87 | ||||
29.5000 | 1.16142 | |||||||
29.7656 | 1.17188 | 1+11⁄64 | 1+1⁄4-12 | 72 | ||||
30.0000 | 1.18110 | |||||||
30.1625 | 1.18750 | 1+3⁄16 | 1+3⁄8-6 | 87 | ||||
30.5000 | 1.20079 | |||||||
30.5594 | 1.20313 | 1+13⁄64 | 1+3⁄8-6 | 79 | ||||
30.9563 | 1.21875 | 1+7⁄32 | 1+3⁄8-6 | 72 | ||||
31.0000 | 1.22047 | |||||||
31.3531 | 1.23438 | 1+15⁄64 | 1+3⁄8-6 | 65 | ||||
31.5000 | 1.24016 | |||||||
32.0000 | 1.25984 | |||||||
32.5000 | 1.27953 | |||||||
32.5438 | 1.28125 | 1+9⁄32 | 1+3⁄8-12 | 87 | ||||
32.9406 | 1.29688 | 1+19⁄64 | 1+3⁄8-12 | 72 | ||||
33.0000 | 1.29921 | |||||||
33.3375 | 1.31250 | 1+5⁄16 | 1+1⁄2-6 | 87 | ||||
33.5000 | 1.31890 | |||||||
33.7344 | 1.32813 | 1+21⁄64 | 1+1⁄2-6 | 79 | ||||
34.0000 | 1.33858 | |||||||
34.1313 | 1.34375 | 1+11⁄32 | 1+1⁄2-6 | 72 | ||||
34.5000 | 1.35827 | |||||||
34.5281 | 1.35938 | 1+23⁄64 | 1+1⁄2-6 | 65 | ||||
35.0000 | 1.37795 | |||||||
35.5000 | 1.39764 | |||||||
35.7188 | 1.40625 | 1+13⁄32 | 1+1⁄2-12 | 87 | ||||
36.0000 | 1.41732 | |||||||
36.1156 | 1.42188 | 1+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.
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