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RECOMMENDED DRILL SIZES

FOR

SELF-TAPPING SCREWS (SHEET METAL)

Self-Tapping Screw Size Major Thread Diameter Minor Thread Diameter For Heavy Metals For Light Metals

No.

Threads per Inch

O.D.

Max.

Mean  Min.

Max.

 

Mean Min. Drill Size Drill Size
2 32 .086 .088 .0850 .082 .064 .0620 .060 49 .0730 49 .0730
4 24 .112 .114 .1110 .108 .086 .0840 .082 41 .0960 41 .0960
5 20 .125 .130 .1265 .123 .094 .0920 .090 36 .1065 36 .1065
6 20 .138 .139 .1355 .132 .104 .1015 .099 32 .1160 32 .1160
7 19 .151 .154 .1505 .147 .115 .1120 .109 30 .1285 30 .1285
8 18 .164 .166 .1625 .159 .122 .1190 .116 28 .1405 29 .1360
10 16 .190 .189 .1855 .182 .141 .1380 .135 20 .1610 21 .1590
12 14 .216 .215 .2115 .208 .164 .1605 .157 13 .1850 14 .1820
1/4 14 .250 .246 .2415 .237 .192 .1885 .185 3 .2130 4 .2090
5/16 12 .313 .315 .3105 .306 .244 .2400 .236 I .2720 H .2660
3/8 12 .375 .380 .3755 .371 .309 .3040 .299 R .3390 Q .3320

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