Number Machine Screws Tap Drills Chart
This table is the chart for publication of information of number machine screws, along with tap and clearance drill information. If all else fails, you may want to use our Drill Size Conversion Table Tap Drill Size Calculator Number Machine Screws Metric Chart
US Screw Sizes
Screw Size
Tapping Drills
Clearance Drills
Number Threads Series Nom. Dia. (in)
Drill Size(65-75% thread) Equivalents
Close Fit Free Fit
(decimal) (mm)
Drill Size Dec. Equiv. Drill Size Dec. Equiv.
000 120 0.0340
71 0.0260 0.6604
65 0.0350 62 0.0380
00 90 0.0470
65 0.0350 0.8890
3/64" 0.0469 55 0.0520
0 80 NF 0.0600
3/64" 0.0469 1.1913
52 0.0635 50 0.0700
1 56 NS 0.0730
54 0.0550 1.3970
48 0.0760 46 0.0810
64 NC
53 0.0595 1.5113
72 NF
53 0.0595 1.5113
2 56 NC 0.0860
50 0.0700 1.7780
43 0.0890 41 0.0960
64 NF
50 0.0700 1.7780
3 48 NC 0.0990
47 0.0785 1.9939
37 0.1040 35 0.1100
56 NF
45 0.0820 2.0828
4 36 NS 0.1120
44 0.0860 2.1844
32 0.1160 30 0.1285
40 NC
43 0.0890 2.2606
48 NF
42 0.0935 2.3749
5 40 NC 0.1250
38 0.1015 2.5781
30 0.1285 29 0.1360
44 NF
37 0.1040 2.6416
6 32 NC 0.1380
36 0.1065 2.7051
27 0.1440 25 0.1495
36 NS
34 0.1110 2.8194
40 NF
33 0.1130 2.8702
8 32 NC 0.1640
29 0.1360 3.4544
18 0.1695 16 0.1770
36 NF
29 0.1360 3.4544
40 NS
28 0.1405 3.5687
10 24 NC 0.1900
25 0.1495 3.7973
9 0.1960 7 0.2010
30 NS
22 0.1570 3.9878
32 NF
21 0.1590 4.0386
12 24 NC 0.2160
16 0.1770 4.4958
2 0.2210 1 0.2280
28 NF
14 0.1820 4.6228
32 NEF
13 0.1850 4.6990
14 20 NS 0.2420
10 0.1935 4.9149
D 0.2460 F 0.2570
24 NS
7 0.2010 5.1054
Number Threads Series Nom. Dia. (in)
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
Updated: 8/13/11
