Self Tapping Screw Thread Dimensions
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The tables below show the thread pitch, major and minor diameters of metric and imperial self tapping screws.
For guidance only
Nominal Size | Pitch | Major Diameter | Minor Diameter | ||
---|---|---|---|---|---|
max | min | max | min | ||
2.2 | 0.8 | 2.24 | 2.1 | 1.63 | 1.52 |
2.9 | 1.1 | 2.9 | 2.76 | 2.18 | 2.08 |
3.5 | 1.3 | 3.53 | 3.35 | 2.64 | 2.51 |
3.9 | 1.4 | 3.91 | 3.73 | 2.92 | 2.77 |
4.2 | 1.4 | 4.22 | 4.04 | 3.1 | 2.95 |
4.8 | 1.6 | 4.8 | 4.62 | 3.58 | 3.43 |
5.5 | 1.8 | 5.46 | 5.28 | 4.17 | 3.99 |
6.3 | 1.8 | 6.25 | 6.03 | 4.88 | 4.7 |
Screw | Threads Per Inch | Major Diameter | Minor Diameter | ||
---|---|---|---|---|---|
max | min | max | min | ||
No. 2 | 32 | 0.088 | 0.083 | 0.064 | 0.06 |
No. 4 | 24 | 0.114 | 0.109 | 0.086 | 0.082 |
No. 6 | 20 | 0.139 | 0.132 | 0.104 | 0.099 |
No. 7 | 19 | 0.154 | 0.147 | 0.115 | 0.109 |
No. 8 | 18 | 0.166 | 0.159 | 0.122 | 0.116 |
No. 10 | 16 | 0.189 | 0.182 | 0.141 | 0.135 |
No. 12 | 14 | 0.215 | 0.208 | 0.164 | 0.157 |
No. 14 | 14 | 0.246 | 0.237 | 0.192 | 0.185 |
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