THREAD FORMING SCREWS 
Suggested Hole Sizes for Thread Forming Screws
Nominal
Screw Size |
Hole Diameter
|
Closest Drill Size to Mean Hole Diameter |
|||
Max |
Mean |
Min |
Drill size |
Drill Dia |
|
2 - 56 |
0.078 |
0.076 |
0.074 |
48 |
0.076 |
2 - 64 |
0.077 |
||||
3 - 48 |
0.090 |
0.087 |
0.084 |
44 |
0.086 |
3 - 56 |
0.089 |
||||
4 - 40 |
0.100 |
0.097 |
0.094 |
41 |
0.096 |
4 - 48 |
0.100 |
||||
5 - 40 |
0.113 |
0.110 |
0.107 |
35 |
0.110 |
5 - 44 |
0.112 |
||||
6 - 32 |
0.123 |
0.119 |
0.115 |
31 |
0.120 |
6 - 40 |
0.124 |
||||
8 - 32 |
0.150 |
0.146 |
0.141 |
20 |
0.147 |
8 - 36 |
0.148 |
||||
10 - 24 |
0.170 |
0.165 |
0.160 |
19 |
0.166 |
10 - 32 |
0.177 |
0.172 |
0.167 |
11-64 |
0.1719 |
12 - 24 |
0.198 |
0.192 |
0.186 |
11 |
0.191 |
12 - 28 |
0.196 |
||||
1/4 - 20 |
0.228 |
0.221 |
0.214 |
2 |
0.221 |
1/4 - 28 |
0.230 |
||||
5/16 - 18 |
0.289 |
0.218 |
0.273 |
K |
0.281 |
5/16 - 24 |
0.290 |
||||
3/8 - 16 |
0.349 |
0.339 |
0.329 |
R |
0.339 |
3/8 - 24 |
0.353 |
||||
7/16 - 14 |
0.409 |
0.397 |
0.385 |
X |
0.397 |
7/16 - 20 |
0.411 |
||||
1/2 - 13 |
0.471 |
0.457 |
0.443 |
29/64 |
0.4531 |
1/2 - 20 |
0.475 |
||||
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