Tap and Drill Chart
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| To Tap this Size Screw Or Bolt: | Use This Drill Bit: | (Closest Fractional:) | Decimal Inches |
| 0-80 NF | 3/64″ | 3/64″ | .0469 |
| 0-80 NF | 3/64″ | 3/64″ | .0469 |
| 1-64 NC | #53 | – | .0595 |
| 1-72 NF | #53 | 1/16″ | .0595 |
| 2-56 NC | #50 | – | .0700 |
| 2-64 NF | #50 | – | .0700 |
| 3-48 NC | #47 | 5/64″ | .0785 |
| 3-56 NF | #45 | – | .0820 |
| 4-36 NS | #44 | – | .0860 |
| 4-40 NC | #43 | 3/32″ | .0890 |
| 4-48 NF | #42 | 3/32″ | .0935 |
| 3mm- .060mm | 2.5mm | – | .0984 |
| 1/8-40 NS | #38 | – | .1015 |
| 5-40 NC | #38 | – | .1015 |
| 5-44 NF | #37 | – | .1040 |
| 6-32 NC | #35 | 7/64″ | .1100 |
| 6-36 NS | #34 | – | .1110 |
| 6-40 NF | #33 | – | .1130 |
| 6-48 NS | #31 | – | .1200 |
| 4mm-0.70mm | 3.4mm | – | .1338 |
| 4mm-.075mm | 3.4mm | – | .1338 |
| 8-32 NC | #29 | – | .1360 |
| 8-36 NF | #29 | 9/64″ | .1360 |
| 8-40 NS | #28 | – | .1405 |
| 3/16-24 NS | #26 | – | .1470 |
| 10-24 NC | #25 | 5/32″ | .1495 |
| 3/16-32 NS | #22 | – | .1570 |
| 10-32 NF | #21 | 5/32″ | .1590 |
| 5mm-.090mm | 4.2mm | – | .1653 |
| 5mm-.080mm | 4.3mm | – | .1693 |
| 12-24 NC | #16 | 11/64″ | .1770 |
| 12-28 NF | #14 | 3/16″ | .1820 |
| 12-32 NEF | #13 | – | .1850 |
| 14-20 NS | #10 | – | .1935 |
| 1//4-20 NC | #7 | 13/64″ | .2010 |
| 14-24 NS | #7 | – | .2010 |
| 6mm-1.00mm | 5.2mm | – | .2047 |
| 1/4-24 NS | #4 | – | .2090 |
| 1/4-28 NF | #3 | 7/32″ | .2130 |
| 1/4-32 NEF | 7/32″ | 7/32″ | .2188 |
| 1/4-40 NS | #1 | – | .2280 |
| 7mm-1.00mm | 6.1mm | 15/64″ | .2401 |
| 5/16-18 NC | Ltr.F | 17/64″ | .2570 |
| 8mm-1.25mm | 6.9mm | 17/64″ | .2716 |
| 5/16-24 NF | Ltr.I | – | .2720 |
| 8mm-1.00mm | 7.1mm | – | .2795 |
| 5/16-32 NEF | 9/32″ | 9/32″ | .2812 |
| 9mm-1.25mm | 7.9mm | – | .3110 |
| 3/8-16 NC | 5/16″ | 5/16″ | .3125 |
| 9mm-1.00mm | 8.1mm | – | .3189 |
| 9mm-0.75mm | 8.3mm | – | .3268 |
| 3/8-24 NF | Ltr.Q | 21/64″ | .3320 |
| 10mm- 1.50mm | 8.7mm | – | .3425 |
| 10mm- 1.25mm | 8.9mm | 11/32″ | .3503 |
| 10mm- 1.00mm* | 9.1mm | – | .3583 |
| 7/16- 14 NC | Ltr.U | 23/64″ | .3680 |
| 11mm 1.50mm | 9.7mm | – | .3818 |
| 7/16-20 NF | 25/64″ | 25/64″ | .3906 |
| 12mm- 1.75mm | 10.5mm | – | .4133 |
| 12mm- 1.50mm | 10.7mm | 27/64″ | .4212 |
| 1/2-13 NC | 27/64″ | 27/64″ | .4219 |
| 12mm- 1.25mm* | 10.9mm | 27/64″ | .4291 |
| 1/2-20 NF | 29/64″ | 29/64″ | .4531 |
| 1/2-24 NS | 29/64″ | 29/64″ | .4531 |
| 14mm-2.00mm | 12.2mm | – | .4803 |
| 9/16-12 NC | 31/64″ | 31/64″ | .4844 |
| 14mm- 1.50mm | 12.7mm | – | .4999 |
| 14mm-1.25mm* | 12.8mm | – | .5039 |
| 9/16-18 NF | 33/64″ | 33/64″ | .5156 |
| 5/8-11 NC | 17/32″ | 17/32″ | .5312 |
| 16mm-2.00mm | 14.2mm | 35/64″ | .5590 |
| 5/8-18 NF | 37/64″ | 37/64″ | .5781 |
| 16mm- 1.50mm | 14.7mm | – | .5787 |
| 11/16-11 NS | 19/32″ | 19/32″ | .5938 |
| 18mm-2.50mm | 15.8mm | 39/64″ | .5220 |
| 11/16-16 NS | 5/8″ | 5/8″ | .6250 |
| 3/4-10 NC | 21/32″ | 21/32″ | .6562 |
| 18mm-1.50mm* | 16.8mm | – | .6614 |
| 3/4-16 NF | 11/16″ | 11/16″ | .6875 |
| 20mm-2.50mm | 17.8mm | 11/16″ | .7008 |
| 7/8-9 NC | 49/64″ | 49/64″ | .7656 |
| 7/8-14 NF | 13/16″ | 13/16″ | .8125 |
| 22mm-1.50mm | 20.9mm | – | .8228 |
| 7/8-18 NS* | 53/64″ | 53/64″ | .8281 |
| 24mm-3.00mm | 21.4mm | 53/64″ | .8425 |
| 1.8 NC | 7/8″ | 7/8″ | .8750 |
| 24mm-2.00mm | 22.3mm | – | .8779 |
| 1.12 NF | 59/64″ | 59/64″ | .9219 |
| 1-14 NS | 15/16″ | 15/16″ | .9375 |
| 1 1/8-7 NC | 63/64″ | 63/64″ | .9844 |
| 1 1/8-12 NF | 1 3/64″ | 1 3/64″ | 1.0469 |
| 1 1/4-7 NC | 1 7/64″ | 1 7/64″ | 1.1094 |
| 1 1/4-12 NF | 1 11/64″ | 1 11/64″ | 1.1719 |
| 1 3/8-6 NC | 1 7/32″ | 1 7/32″ | 1.2188 |
| 1 3/8-12 NF | 1 19/64″ | 1 19/64″ | 1.2969 |
| 1 1/2-6 NC | 1 11/32″ | 1 11/32″ | 1.3438 |
| 1 1/2″-12 NF | 1 27/64″ | 1 27/64″ | 1.4219 |
| *These Sizes Are Spark Plug Taps | |||
Tap & Drill Chart
July 12, 2012