When working with threaded holes, choosing the right tap size is essential for proper fit and function. A tap size chart helps match the correct drill bit to the tap being used, whether you’re working with UNC, UNF, or metric threads. This reference is a quick way to avoid common threading mistakes and ensure accurate machining.
| Tap Size | Diameter (in) | Diameter (mm) | Thread Count (TPI) | Thread Pitch (mm) | Tap Drill Size |
|---|---|---|---|---|---|
| #0000-160 | 0.0210 | 0.53 | 160 | 0.159 | 0.0135 |
| #000-120 | 0.0340 | 0.86 | 120 | 0.212 | 0.0225 |
| M1x0.2 | 0.0394 | 1.00 | 127 | 0.200 | 0.031 |
| M1x0.25 | 0.0394 | 1.00 | 102 | 0.250 | 0.030 |
| M1.1×0.25 | 0.0433 | 1.10 | 102 | 0.250 | 0.033 |
| M1.1×0.2 | 0.0433 | 1.10 | 127 | 0.200 | 0.035 |
| #00-90 | 0.0470 | 1.19 | 90 | 0.282 | 0.0320 |
| M1.2×0.2 | 0.0472 | 1.20 | 127 | 0.200 | 0.039 |
| M1.2×0.25 | 0.0472 | 1.20 | 102 | 0.250 | 0.037 |
| M1.4×0.2 | 0.0551 | 1.40 | 127 | 0.200 | 0.047 |
| M1.4×0.3 | 0.0551 | 1.40 | 85 | 0.300 | 0.043 |
| #0-80 | 0.0600 | 1.52 | 80 | 0.318 | 0.0469 |
| M1.6×0.2 | 0.0630 | 1.60 | 127 | 0.200 | 0.055 |
| M1.6×0.35 | 0.0630 | 1.60 | 73 | 0.350 | 0.049 |
| M1.8×0.2 | 0.0709 | 1.80 | 127 | 0.200 | 0.063 |
| M1.8×0.35 | 0.0709 | 1.80 | 73 | 0.350 | 0.057 |
| #1-64 | 0.0730 | 1.85 | 64 | 0.397 | 0.0595 |
| #1-72 | 0.0730 | 1.85 | 72 | 0.353 | 0.0635 |
| M2x0.25 | 0.0787 | 2.00 | 102 | 0.250 | 0.069 |
| M2x0.4 | 0.0787 | 2.00 | 64 | 0.400 | 0.063 |
| #2-56 | 0.0860 | 2.18 | 56 | 0.454 | 0.0700 |
| #2-64 | 0.0860 | 2.18 | 64 | 0.397 | 0.0730 |
| M2.2×0.25 | 0.0866 | 2.20 | 102 | 0.250 | 0.077 |
| M2.2×0.45 | 0.0866 | 2.20 | 56 | 0.450 | 0.069 |
| M2.5×0.35 | 0.0984 | 2.50 | 73 | 0.350 | 0.083 |
| M2.5×0.45 | 0.0984 | 2.50 | 56 | 0.450 | 0.079 |
| #3-48 | 0.0990 | 2.51 | 48 | 0.529 | 0.0785 |
| #3-56 | 0.0990 | 2.51 | 56 | 0.454 | 0.0820 |
| #4-40 | 0.1120 | 2.84 | 40 | 0.635 | 0.0890 |
| #4-48 | 0.1120 | 2.84 | 48 | 0.529 | 0.0935 |
| M3x0.35 | 0.1181 | 3.00 | 73 | 0.350 | 0.104 |
| M3x0.5 | 0.1181 | 3.00 | 51 | 0.500 | 0.098 |
| #5-40 | 0.1250 | 3.18 | 40 | 0.635 | 0.1015 |
| #5-44 | 0.1250 | 3.18 | 44 | 0.577 | 0.1040 |
| M3.5×0.35 | 0.1378 | 3.50 | 73 | 0.350 | 0.122 |
| M3.5×0.6 | 0.1378 | 3.50 | 42 | 0.600 | 0.114 |
| #6-32 | 0.1380 | 3.51 | 32 | 0.794 | 0.1065 |
| #6-40 | 0.1380 | 3.51 | 40 | 0.635 | 0.1130 |
| M4x0.35 | 0.1575 | 4.00 | 73 | 0.350 | 0.142 |
| M4x0.5 | 0.1575 | 4.00 | 51 | 0.500 | 0.138 |
| M4x0.7 | 0.1575 | 4.00 | 36 | 0.700 | 0.130 |
| #8-32 | 0.1640 | 4.17 | 32 | 0.794 | 0.1360 |
| #8-36 | 0.1640 | 4.17 | 36 | 0.706 | 0.1405 |
| M4.5×0.5 | 0.1772 | 4.50 | 51 | 0.500 | 0.157 |
| M4.5×0.75 | 0.1772 | 4.50 | 34 | 0.750 | 0.146 |
| #10-32 | 0.1900 | 4.83 | 32 | 0.794 | 0.1590 |
| #10-24 | 0.1900 | 4.83 | 24 | 1.058 | 0.1495 |
| M5x0.5 | 0.1969 | 5.00 | 51 | 0.500 | 0.177 |
| M5x0.8 | 0.1969 | 5.00 | 32 | 0.800 | 0.165 |
| #12-24 | 0.2160 | 5.49 | 24 | 1.058 | 0.1770 |
| #12-28 | 0.2160 | 5.49 | 28 | 0.907 | 0.1820 |
| M5.5×0.5 | 0.2165 | 5.50 | 51 | 0.500 | 0.197 |
| M6x0.5 | 0.2362 | 6.00 | 51 | 0.500 | 0.217 |
| M6x0.75 | 0.2362 | 6.00 | 34 | 0.750 | 0.205 |
| M6x1 | 0.2362 | 6.00 | 25 | 1.000 | 0.197 |
| 1/4-20 | 0.2500 | 6.35 | 20 | 1.270 | 0.2010 |
| 1/4-28 | 0.2500 | 6.35 | 28 | 0.907 | 0.2130 |
| M7x0.75 | 0.2756 | 7.00 | 34 | 0.750 | 0.244 |
| M7x1 | 0.2756 | 7.00 | 25 | 1.000 | 0.236 |
| 5/16-18 | 0.3125 | 7.94 | 18 | 1.411 | 0.2570 |
| 5/16-24 | 0.3125 | 7.94 | 24 | 1.058 | 0.2720 |
| M8x0.5 | 0.3150 | 8.00 | 51 | 0.500 | 0.295 |
| M8x0.75 | 0.3150 | 8.00 | 34 | 0.750 | 0.284 |
| M8x1 | 0.3150 | 8.00 | 25 | 1.000 | 0.276 |
| M8x1.25 | 0.3150 | 8.00 | 20 | 1.250 | 0.267 |
| M9x0.75 | 0.3543 | 9.00 | 34 | 0.750 | 0.323 |
| M9x1 | 0.3543 | 9.00 | 25 | 1.000 | 0.315 |
| M9x1.25 | 0.3543 | 9.00 | 20 | 1.250 | 0.307 |
| 3/8-24 | 0.3750 | 9.53 | 24 | 1.058 | 0.3320 |
| 3/8-16 | 0.3750 | 9.53 | 16 | 1.588 | 0.3125 |
| M10x0.75 | 0.3937 | 10.00 | 34 | 0.750 | 0.362 |
| M10x1.5 | 0.3937 | 10.00 | 17 | 1.500 | 0.335 |
| M10x1.25 | 0.3937 | 10.00 | 20 | 1.250 | 0.346 |
| M10x1 | 0.3937 | 10.00 | 25 | 1.000 | 0.354 |
| M11x0.75 | 0.4331 | 11.00 | 34 | 0.750 | 0.402 |
| M11x1 | 0.4331 | 11.00 | 25 | 1.000 | 0.394 |
| M11x1.5 | 0.4331 | 11.00 | 17 | 1.500 | 0.374 |
| 7/16-14 | 0.4375 | 11.11 | 14 | 1.814 | 0.3680 |
| 7/16-20 | 0.4375 | 11.11 | 20 | 1.270 | 0.3906 |
| M12x1.5 | 0.4724 | 12.00 | 17 | 1.500 | 0.413 |
| M12x1.75 | 0.4724 | 12.00 | 15 | 1.750 | 0.402 |
| M12x0.75 | 0.4724 | 12.00 | 34 | 0.750 | 0.441 |
| M12x1 | 0.4724 | 12.00 | 25 | 1.000 | 0.433 |
| M12x1.25 | 0.4724 | 12.00 | 20 | 1.250 | 0.425 |
| 1/2-20 | 0.5000 | 12.70 | 20 | 1.270 | 0.4531 |
| 1/2-13 | 0.5000 | 12.70 | 13 | 1.954 | 0.4219 |
| M14x1.5 | 0.5512 | 14.00 | 17 | 1.500 | 0.492 |
| M14x1.25 | 0.5512 | 14.00 | 20 | 1.250 | 0.504 |
| M14x1 | 0.5512 | 14.00 | 25 | 1.000 | 0.512 |
| M14x2 | 0.5512 | 14.00 | 13 | 2.000 | 0.472 |
| 9/16-18 | 0.5625 | 14.29 | 18 | 1.411 | 0.5070 |
| 9/16-12 | 0.5625 | 14.29 | 12 | 2.117 | 0.4844 |
| M15x1 | 0.5906 | 15.00 | 25 | 1.000 | 0.551 |
| M15x1.5 | 0.5906 | 15.00 | 17 | 1.500 | 0.531 |
| 5/8-18 | 0.6250 | 15.88 | 18 | 1.411 | 0.5781 |
| 5/8-11 | 0.6250 | 15.88 | 11 | 2.309 | 0.5312 |
| M16x2 | 0.6299 | 16.00 | 13 | 2.000 | 0.551 |
| M16x1.5 | 0.6299 | 16.00 | 17 | 1.500 | 0.571 |
| M16x1 | 0.6299 | 16.00 | 25 | 1.000 | 0.591 |
| M17x1 | 0.6693 | 17.00 | 25 | 1.000 | 0.630 |
| M17x1.5 | 0.6693 | 17.00 | 17 | 1.500 | 0.610 |
| M18x2.5 | 0.7087 | 18.00 | 10 | 2.500 | 0.610 |
| M18x1 | 0.7087 | 18.00 | 25 | 1.000 | 0.669 |
| M18x1.5 | 0.7087 | 18.00 | 17 | 1.500 | 0.650 |
| M18x2 | 0.7087 | 18.00 | 13 | 2.000 | 0.630 |
| 3/4-16 | 0.7500 | 19.05 | 16 | 1.588 | 0.6875 |
| 3/4-10 | 0.7500 | 19.05 | 10 | 2.540 | 0.6562 |
| M20x2 | 0.7874 | 20.00 | 13 | 2.000 | 0.709 |
| M20x1.5 | 0.7874 | 20.00 | 17 | 1.500 | 0.728 |
| M20x1 | 0.7874 | 20.00 | 25 | 1.000 | 0.748 |
| M20x2.5 | 0.7874 | 20.00 | 10 | 2.500 | 0.689 |
| M22x2 | 0.8661 | 22.00 | 13 | 2.000 | 0.787 |
| M22x1.5 | 0.8661 | 22.00 | 17 | 1.500 | 0.807 |
| M22x1 | 0.8661 | 22.00 | 25 | 1.000 | 0.827 |
| M22x2.5 | 0.8661 | 22.00 | 10 | 2.500 | 0.768 |
| 7/8-9 | 0.8750 | 22.23 | 9 | 2.822 | 0.7656 |
| 7/8-14 | 0.8750 | 22.23 | 14 | 1.814 | 0.8125 |
| M24x3 | 0.9449 | 24.00 | 8 | 3.000 | 0.827 |
| M24x1 | 0.9449 | 24.00 | 25 | 1.000 | 0.906 |
| M24x1.5 | 0.9449 | 24.00 | 17 | 1.500 | 0.886 |
| M24x2 | 0.9449 | 24.00 | 13 | 2.000 | 0.866 |
| M25x2 | 0.9843 | 25.00 | 13 | 2.000 | 0.906 |
| M25x1 | 0.9843 | 25.00 | 25 | 1.000 | 0.945 |
| M25x1.5 | 0.9843 | 25.00 | 17 | 1.500 | 0.925 |
| 1-14 | 1.0000 | 25.40 | 14 | 1.814 | 0.9375 |
| 1-8 | 1.0000 | 25.40 | 8 | 3.175 | 0.8750 |
| M26x1.5 | 1.0236 | 26.00 | 17 | 1.500 | 0.965 |
| M27x1.5 | 1.0630 | 27.00 | 17 | 1.500 | 1.004 |
| M27x3 | 1.0630 | 27.00 | 8 | 3.000 | 0.945 |
| M27x1 | 1.0630 | 27.00 | 25 | 1.000 | 1.024 |
| M27x2 | 1.0630 | 27.00 | 13 | 2.000 | 0.984 |
| M28x2 | 1.1024 | 28.00 | 13 | 2.000 | 1.024 |
| M28x1 | 1.1024 | 28.00 | 25 | 1.000 | 1.063 |
| M28x1.5 | 1.1024 | 28.00 | 17 | 1.500 | 1.043 |
| 1 1/8-12 | 1.1250 | 28.58 | 12 | 2.117 | 1.0469 |
| 1 1/8-7 | 1.1250 | 28.58 | 7 | 3.629 | 0.9844 |
| M30x1.5 | 1.1811 | 30.00 | 17 | 1.500 | 1.122 |
| M30x3.5 | 1.1811 | 30.00 | 7 | 3.500 | 1.043 |
| M30x2 | 1.1811 | 30.00 | 13 | 2.000 | 1.102 |
| 1 1/4-12 | 1.2500 | 31.75 | 12 | 2.117 | 1.1719 |
| 1 1/4-7 | 1.2500 | 31.75 | 7 | 3.629 | 1.1094 |
| M33x2 | 1.2992 | 33.00 | 13 | 2.000 | 1.220 |
| M33x3.5 | 1.2992 | 33.00 | 7 | 3.500 | 1.161 |
| M36x3 | 1.4173 | 36.00 | 8 | 3.000 | 1.260 |
| M36x4 | 1.4173 | 36.00 | 6 | 4.000 | 1.181 |
| 1 1/2-12 | 1.5000 | 38.10 | 12 | 2.117 | 1.4219 |
| 1 1/2-6 | 1.5000 | 38.10 | 6 | 4.233 | 1.3438 |
| M39x4 | 1.5354 | 39.00 | 6 | 4.000 | 1.378 |
| M39x3 | 1.5354 | 39.00 | 8 | 3.000 | 1.417 |
| M42x4.5 | 1.6535 | 42.00 | 6 | 4.500 | 1.476 |
| 1 3/4-12 | 1.7500 | 44.45 | 12 | 2.117 | 1.6719 |
| 1 3/4-5 | 1.7500 | 44.45 | 5 | 5.080 | 1.5938 |
| M45x4.5 | 1.7717 | 45.00 | 6 | 4.500 | 1.594 |
| M48x5 | 1.8898 | 48.00 | 5 | 5.000 | 1.693 |
| 2-12 | 2.0000 | 50.80 | 12 | 2.117 | 1.9219 |
| 2-4.5 | 2.0000 | 50.80 | 4.5 | 5.644 | 1.8125 |
| M52x5 | 2.0472 | 52.00 | 5 | 5.000 | 1.850 |
| M56x5.5 | 2.2047 | 56.00 | 5 | 5.500 | 1.968 |
| M60x5.5 | 2.3622 | 60.00 | 5 | 5.500 | 2.126 |
| M64x6 | 2.5197 | 64.00 | 4 | 6.000 | 2.244 |
| M68x6 | 2.6772 | 68.00 | 4 | 6.000 | 2.402 |
Parting Thoughts
MISUMI USA offers a wide range of threading tools and hand taps—both standard and configurable—including forming taps, hand taps, spiral taps, and more. If you’re unsure which threading product best suits your application, our engineering team is here to help. For more technical insights, explore our other manufacturing-focused tables and articles, such as a machine screw size chart.
Browse Threading ProductsAuthor: Scott Bredemann | Updated: 6/17/2025
Disclaimer:
The content on this webpage is for informational purposes only. MISUMI makes no guarantees, expressed or implied, regarding the accuracy, completeness, or validity of the information. Performance parameters, tolerances, designs, materials, or processes should not be assumed to reflect third-party suppliers’ or manufacturers’ deliverables within MISUMI’s network. Buyers are responsible for specifying their part requirements