# List of drill and tap sizes

Below is a comprehensive drill and tap size chart for all drills and taps: Inch, 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.

## 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 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. 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 in (20 threads per inch) has a pitch of 0.050 in and a 1⁄13 in pitch (13 threads per inch) has a pitch of 0.077 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 1⁄4–1 in (6.4–25.4 mm), the sizes most important on many shop floors. Some sizes outside that range have different ratios.
Below, these guidelines are explored with examples.

## Examples

** Example (inch, coarse): For size 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 in × 0.85 = 0.371 in. Therefore, a size 7⁄16 screw (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 in; 84.2%), 9.5 mm (0.374 in; 85.6%), and 3⁄8 in (0.375 in; 85.8%); any of these will work well.
** Example (inch, fine): For 7⁄16-20 (same diameter as the previous example, but this time with 20 threads per inch, which is considered fine), 0.437 in × 0.90 = 0.393 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 25⁄64 (0.391 in; 89.4%), 10 mm (0.393 in; 90%), and letter X (0.397 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 mm × 0.85 = 5.95 mm.
*** The drill sizes that are near this are 15⁄64 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 mm × 0.90 = 6.30.
*** The drill sizes that are near this are 6.3 mm (90%), 1⁄4 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, 1⁄20 = 0.050 and 1⁄13 ≈ 0.077), and your result will only land near a tap drill size (not directly on one).
** Example (inch coarse): For 7⁄16-14, 1 in ÷ 14 = 0.071 in; 0.437 in − 0.071 in = 0.366 in;
*** The drill sizes that are near this are 9.3 mm (0.366 in) and letter U (0.368 in). In addition, 9.5 mm (0.374 in), and 3⁄8 in (0.375 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 7⁄16-20, 1 in ÷ 20 = 0.050 in; 0.437 in − 0.050 in = 0.387 in;
*** The drill sizes that are near this are letter W (0.386 in) and 25⁄64 in (0.391 in). In addition, 10 mm (0.393 in), and letter X (0.397 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, 1⁄4, 6.4 mm) will work well.

## Chart

| Drill bit diameter | Drill bit diameter | Fractional size | Drill wire gauge | Tap size | Clearance | Clearance | Thread depth$^†$ (%) | Outer diameter |
| (mm, 4 d.p.) | (in, 5 d.p.) | (in) | Drill wire gauge | Tap size | Close fit | Free fit | Thread depth$^†$ (%) | Outer diameter |
| 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 | Drill bit diameter | Fractional size | Drill wire gauge | Tap size | Clearance | Clearance | Thread depth$^†$ (%) | Outer diameter |
| (mm, 4 d.p.) | (in, 5 d.p.) | (in) | Drill wire gauge | Tap size | Close fit | Free fit | Thread depth$^†$ (%) | Outer diameter |
| 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 | Drill bit diameter | Fractional size | Drill wire gauge | Tap size | Clearance | Clearance | Thread depth$^†$ (%) | Outer diameter |
| (mm, 4 d.p.) | (in, 5 d.p.) | (in) | Drill wire gauge | Tap size | Close fit | Free fit | Thread depth$^†$ (%) | Outer diameter |
| 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 | Drill bit diameter | Fractional size | Drill wire gauge | Tap size | Clearance | Clearance | Thread depth$^†$ (%) | Outer diameter |
| (mm, 4 d.p.) | (in, 5 d.p.) | (in) | Drill wire gauge | Tap size | Close fit | Free fit | Thread depth$^†$ (%) | Outer diameter |
| 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 | Drill bit diameter | Fractional size | Drill wire gauge | Tap size | Clearance | Clearance | Thread depth$^†$ (%) | Outer diameter |
| (mm, 4 d.p.) | (in, 5 d.p.) | (in) | Drill wire gauge | Tap size | Close fit | Free fit | Thread depth$^†$ (%) | Outer diameter |
| 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 | 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 | | | | | | |
| 6.3500 | 0.25000 | | E | | | | | |
| 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 $^{(sparkplug)}$ | | | | |
| 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 $^{(sparkplug)}$ | | | | |
| 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 | |
| 12.7000 | 0.50000 | | | M14×1.5 | | | 75 | |
| 12.8000 | 0.50393 | | | M14×1.25 $^{(sparkplug)}$ | | | | |
| 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 $^{(sparkplug)}$ | | | | |
| 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 $^{(sparkplug)}$ | | | | |
| 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.