Fractional Machine Screws Tapping
And Clearance Drills Table
This table is the chart for publication of information of fractional machine screws, along with tap and clearance drill information. If all else fails, you may want to use our Drill Size Conversion Table or our Tap Drill Size Calculator. The information available from our sources is usually sufficient for all computer related drill or screw requirements world wide.
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| Screw Size |
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Tapping Drills |
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Clearance Drills |
| Nom. Dia. (in) | Threads
/Inch | Series | Dec. Equiv. |
Drill Size
(65-75% thread) | Equivalents |
Close Fit | Free Fit |
| (decimal) | (mm) |
Drill Size | Dec. Equiv. | Drill Size | Dec. Equiv. |
|
| 1/16 | 64 | NS | 0.0625 |
3/64" | 0.0469 | 1.1913 |
52 | 0.0635 | 51 | 0.0670 |
| 72 | NS |
3/64" | 0.0469 | 1.1913 |
| 5/64 | 60 | NS | 0.0781 |
1/16" | 0.0625 | 1.5875 |
46 | 0.0810 | 45 | 0.0820 |
| 72 | NS |
52 | 0.0635 | 1.6129 |
| 3/32 | 48 | NS | 0.0938 |
49 | 0.0730 | 1.8542 |
41 | 0.0960 | 40 | 0.0980 |
| 50 | NS |
49 | 0.0730 | 1.8542 |
| 7/64 | 48 | NS | 0.1094 |
43 | 0.0890 | 2.2606 |
34 | 0.1110 | 32 | 0.1160 |
| 1/8 | 32 | NS | 0.1250 |
3/32" | 0.0938 | 2.3825 |
30 | 0.1285 | 29 | 0.1360 |
| 40 | NS |
38 | 0.1015 | 2.5781 |
| 9/64 | 40 | NS | 0.1406 |
32 | 0.1160 | 2.9464 |
27 | 0.1440 | 26 | 0.1470 |
| 5/32 | 32 | NS | 0.1563 |
1/8" | 0.1250 | 3.1750 |
20 | 0.1610 | 19 | 0.1660 |
| 36 | NS |
30 | 0.1285 | 3.2639 |
| 11/64 | 32 | NS | 0.1719 |
9/64" | 0.1406 | 3.5712 |
16 | 0.1770 | 15 | 0.1800 |
| 3/16 | 24 | NS | 0.1875 |
26 | 0.1470 | 3.7338 |
11 | 0.1910 | 9 | 0.1960 |
| 32 | NS |
22 | 0.1570 | 3.9878 |
| 13/64 | 24 | NS | 0.2031 |
20 | 0.1610 | 4.0894 |
4 | 0.2090 | 3 | 0.2130 |
| 7/32 | 24 | NS | 0.2188 |
16 | 0.1770 | 4.4958 |
2 | 0.2210 | 1 | 0.2280 |
| 32 | NS |
12 | 0.1890 | 4.8006 |
| 15/64 | 24 | NS | 0.2344 |
10 | 0.1935 | 4.9149 |
C | 0.2420 | D | 0.2460 |
| 1/4 | 20 | NC | 0.2500 |
7 | 0.2010 | 5.1054 |
F | 0.2570 | H | 0.2660 |
| 24 | NS |
4 | 0.2090 | 5.3086 |
| 27 | NS |
3 | 0.2130 | 5.4102 |
| 28 | NF |
3 | 0.2130 | 5.4102 |
| 32 | NEF |
7/32" | 0.2188 | 5.5575 |
| 5/16 | 18 | NC | 0.3125 |
F | 0.2570 | 6.5278 |
P | 0.3230 | Q | 0.3320 |
| 20 | NS |
17/64" | 0.2656 | 6.7462 |
| 24 | NF |
I | 0.2720 | 6.9088 |
| 27 | NS |
J | 0.2770 | 7.0358 |
| 32 | NEF |
9/32" | 0.2812 | 7.1425 |
| 3/8 | 16 | NC | 0.3750 |
5/16" | 0.3125 | 7.9375 |
W | 0.3860 | X | 0.3970 |
| 20 | NS |
21/64" | 0.3281 | 8.3337 |
| 24 | NF |
Q | 0.3320 | 8.4328 |
| 27 | NS |
R | 0.3390 | 8.6106 |
| 32 | NEF |
11/32" | 0.3438" | 8.7325 |
| 7/16 | 14 | NC | 0.4375 |
U | 0.3680 | 9.3472 |
29/64" | 0.4531 | 15/32" | 0.4687 |
| 20 | NF |
25/64" | 0.3906 | 9.9212 |
| 24 | NS |
X | 0.3970 | 10.0838 |
| 27 | NS |
Y | 0.4040 | 10.2616 |
| 28 | NEF |
15/32" | 0.4688 | 11.9075 |
| 1/2 | 12 | NS | 0.5000 |
27/64" | 0.4219 | 10.7163 |
33/64" | 0.5156 | 17/32" | 0.5312 |
| 13 | NC |
27/64" | 0.4219 | 10.7163 |
| 20 | NF |
29/64" | 0.4531 | 11.5087 |
| 24 | NS |
29/64" | 0.4531 | 11.5087 |
| 27 | NS |
15/32" | 0.4688 | 11.9075 |
| 28 | NEF |
15/32" | 0.4688 | 11.9075 |
| 9/16 | 12 | NC | 0.5625 |
31/64" | 0.4844 | 12.3038 |
37/64" | 0.5781 | 19/32" | 0.5938 |
| 18 | NF |
33/64" | 0.5156 | 13.0962 |
| 24 | NEF |
33/64" | 0.5156 | 13.0962 |
| 27 | NS |
17/32" | 0.5313 | 13.4950 |
| 5/8 | 11 | NC | 0.6250 |
17/32" | 0.5313 | 13.4950 |
41/64" | 0.6406 | 21/32" | 0.6562 |
| 12 | NS |
35/64" | 0.5469 | 13.8913 |
| 18 | NF |
37/64" | 0.5781 | 14.6837 |
| 24 | NEF |
37/64" | 0.5781 | 14.6837 |
| 27 | NS |
19/32" | 0.5937 | 15.0800 |
| 11/16 | 11 | NS | 0.6875 |
19/32" | 0.5937 | 15.0800 |
45/64" | 0.7031 | 23/32" | 0.6562 |
| 16 | NS |
5/8" | 0.6250 | 15.8750 |
| 24 | NEF |
41/64" | 0.6406 | 16.4084 |
| 3/4 | 10 | NC | 0.7500 |
21/32" | 0.6562 | 16.6675 |
49/64" | 0.7656 | 25/32" | 0.7812 |
| 12 | NS |
43/64" | 0.6719 | 17.0663 |
| 16 | NF |
11/16" | 0.6875 | 17.4625 |
| 20 | NEF |
45/64" | 0.7031 | 17.8587 |
| 27 | NS |
23/32" | 0.7187 | 18.2550 |
| 13/16 | 10 | NS | 0.8125 |
23/32" | 0.7187 | 18.2550 |
53/64" | 0.8281 | 27/32" | 0.8438 |
| 20 | NEF |
49/64" | 0.7656 | 19.4462 |
| 7/8 | 9 | NC | 0.8750 |
49/64" | 0.7656 | 19.4462 |
57/64" | 0.8906 | 29/32" | 0.9062 |
| 12 | NS |
51/64" | 0.7969 | 20.2413 |
| 14 | NF |
13/16" | 0.8125 | 20.6375 |
| 18 | NS |
53/64" | 0.8281 | 21.0337 |
| 20 | NEF |
53/64" | 0.8281 | 21.0337 |
| 27 | NS |
27/32" | 0.8437 | 21.4300 |
| 15/16 | 9 | NS | 0.9375 |
53/64" | 0.8281 | 21.0337 |
61/64" | 0.9531 | 31/32" | 0.9688 |
| 20 | NEF |
57/64" | 0.8906 | 22.6212 |
| 1 | 8 | NC | 1.0000 |
7/8" | 0.8750 | 22.2250 |
1-1/64" | 1.0156 | 1-1/32" | 1.0313 |
| 12 | NF |
59/64" | 0.9219 | 23.4163 |
| 14 | NS |
15/16" | 0.9375 | 23.8125 |
| 20 | NEF |
61/64" | 0.9531 | 24.2087 |
| 27 | NS |
31/32" | 0.9687 | 24.6050 |
| 32 | * |
31/32" | 0.9687 | 24.6050 |
| 1-1/16 | 18 | NEF | 1.0625 |
1" | 1.0000 | 25.4000 |
1-5/64" | 1.0781 | 1-3/32" | 1.0938 |
| 1-1/8 | 7 | NC | 1.1250 |
63/64" | 0.9844 | 25.0038 |
1-9/64" | 1.1406 | 1-5/32" | 1.1562 |
| 12 | NF |
1-3/64" | 1.0469 | 26.5913 |
| 18 | NEF |
1-1/16" | 1.0625 | 26.9875 |
| 1-3/16 | 18 | NEF | 1.1875 |
1-1/8" | 1.1250 | 28.5750 |
1-13/64" | 1.2031 | 1-7/32" | 1.2188 |
| 1-1/4 | 7 | NC | 1.2500 |
1-7/64" | 1.1094 | 28.1788 |
1-17/64" | 1.2656 | 1-9/32" | 1.2812 |
| 12 | NF |
1-11/64" | 1.1719 | 29.7663 |
| 18 | NEF |
1-3/16" | 1.1875 | 30.1625 |
| 1-5/16 | 18 | NEF | 1.3125 |
1-1/4" | 1.2500 | 31.7500 |
1-21/64" | 1.3281 | 1-11/32" | 1.3438 |
| 1-3/8 | 6 | NC | 1.3750 |
1-7/32" | 1.2188 | 30.9575 |
1-25/64" | 1.3906 | 1-13/32" | 1.4062 |
| 12 | NF |
1-19/64" | 1.2969 | 32.9413 |
| 18 | NEF |
1-5/16" | 1.3125 | 33.3375 |
| 1-7/16 | 18 | NEF | 1.3693 |
1-3/8" | 1.3750 | 34.9250 |
1-29/64" | 1.4531 | 1-15/32" | 1.4688 |
| 1-1/2 | 6 | NC | 1.5000 |
1-11/32" | 1.3438 | 34.1325 |
1-33/64" | 1.5156 | 1-17/32" | 1.5312 |
| 12 | NF |
1-27/64" | 1.4219 | 36.1163 |
| 18 | NEF |
1-7/16" | 1.4375 | 36.5125 |
| 1-9/16 | 18 | NEF | 1.5625 |
1-1/2" | 1.5000 | 38.1000 |
1-37/64" | 1.5781 | 1-19/32" | 1.5938 |
| 1-5/8 | 5 1/2 | NS | 1.6250 |
1-29/64" | 1.4531 | 36.9087 |
1-41/64" | 1.6406 | 1-21/32" | 1.6562 |
| 18 | NEF |
1-9/16" | 1.5625 | 39.6875 |
| 1-11/16 | 18 | NEF | 1.6875 |
1-5/8" | 1.6250 | 41.2750 |
1-45/64" | 1.7031 | 1-23/32" | 1.7188 |
| 1-3/4 | 5 | NC | 1.7500 |
1-9/16" | 1.5625 | 39.6875 |
1-49/64" | 1.7659 | 1-25/32" | 1.7812 |
| 1-7/8 | 5 | NS | 1.8750 |
1-11/16" | 1.6875 | 42.8625 |
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| 2 | 4 1/2 | NC | 2.0000 |
1-25/32" | 1.7813 | 45.2450 |
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| Nom. Dia. (in) | Threads
/Inch | Series | Dec. Equiv. |
Drill Size
(65-75% thread) | (decimal) | (mm) |
Drill Size | Dec. Equiv. | Drill Size | Dec. Equiv. |
| Equivalents |
Close Fit | Free Fit |
| Screw Size |
Tapping Drills |
Clearance Drills |
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Version 1.0.1
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