Fusion360のネジ定義ファイルに、こちらのページを参考にして 天体機材でよく使われるネジ規格を追加してみました。
これで正しいという確証はありません。参考情報として各自の責任でご覧ください。
<ThreadSize>
<Size>28.5</Size>
<Designation>
<ThreadDesignation>M28.5x0.6</ThreadDesignation>
<CTD>M28.5x0.6</CTD>
<Pitch>0.6</Pitch>
<Thread>
<Gender>external</Gender>
<Class>6g</Class>
<MajorDia>28.4</MajorDia>
<PitchDia>28.06</PitchDia>
<MinorDia>27.71</MinorDia>
</Thread>
<Thread>
<Gender>internal</Gender>
<Class>6H</Class>
<MajorDia>28.6</MajorDia>
<PitchDia>28.16</PitchDia>
<MinorDia>27.95</MinorDia>
<TapDrill>27.5</TapDrill>
</Thread>
</Designation>
</ThreadSize>
<ThreadSize>
<Size>36.4</Size>
<Designation>
<ThreadDesignation>M36.4x1</ThreadDesignation>
<CTD>M36.4x1</CTD>
<Pitch>1.0</Pitch>
<Thread>
<Gender>external</Gender>
<Class>6g</Class>
<MajorDia>36.284</MajorDia>
<PitchDia>35.662</PitchDia>
<MinorDia>35.1375</MinorDia>
</Thread>
<Thread>
<Gender>internal</Gender>
<Class>6H</Class>
<MajorDia>36.5572</MajorDia>
<PitchDia>35.8355</PitchDia>
<MinorDia>35.4355</MinorDia>
<TapDrill>35.4</TapDrill>
</Thread>
<Thread>
<Gender>external</Gender>
<Class>4g6g</Class>
<MajorDia>36.284</MajorDia>
<PitchDia>35.6845</PitchDia>
<MinorDia>35.16</MinorDia>
</Thread>
</Designation>
</ThreadSize>
<ThreadSize>
<Size>42.0</Size>
.....
<Designation>
<ThreadDesignation>M42x0.75</ThreadDesignation>
<CTD>M42x0.75</CTD>
<Pitch>0.75</Pitch>
<Thread>
<Gender>external</Gender>
<Class>6g</Class>
<MajorDia>41.908</MajorDia>
<PitchDia>41.4409</PitchDia>
<MinorDia>41.0475</MinorDia>
</Thread>
<Thread>
<Gender>internal</Gender>
<Class>6H</Class>
<MajorDia>42.1201</MajorDia>
<PitchDia>41.5789</PitchDia>
<MinorDia>41.2831</MinorDia>
<TapDrill>41.0</TapDrill>
</Thread>
<Thread>
<Gender>external</Gender>
<Class>4g6g</Class>
<MajorDia>41.908</MajorDia>
<PitchDia>41.4594</PitchDia>
<MinorDia>41.066</MinorDia>
</Thread>
</Designation>
</ThreadSize>
<ThreadSize>
<Size>48.0</Size>
.....
<Designation>
<ThreadDesignation>M48x0.75</ThreadDesignation>
<CTD>M48x0.75</CTD>
<Pitch>0.75</Pitch>
<Thread>
<Gender>external</Gender>
<Class>6g</Class>
<MajorDia>47.9</MajorDia>
<PitchDia>47.46</PitchDia>
<MinorDia>47.03</MinorDia>
</Thread>
<Thread>
<Gender>internal</Gender>
<Class>6H</Class>
<MajorDia>48.1</MajorDia>
<PitchDia>47.56</PitchDia>
<MinorDia>47.29</MinorDia>
<TapDrill>46.5</TapDrill>
</Thread>
</Designation>
</ThreadSize>
<ThreadSize>
<Size>2.0</Size>
.....
<Designation>
<ThreadDesignation>2-24 UN</ThreadDesignation>
<CTD>2-24 UNC</CTD>
<TPI>24.0</TPI>
<Thread>
<Gender>external</Gender>
<Class>2A</Class>
<MajorDia>1.9954</MajorDia>
<PitchDia>1.9702</PitchDia>
<MinorDia>1.9494</MinorDia>
</Thread>
<Thread>
<Gender>internal</Gender>
<Class>2B</Class>
<MajorDia>2.0</MajorDia>
<PitchDia>1.9751</PitchDia>
<MinorDia>1.96</MinorDia>
<TapDrill>1.961</TapDrill>
</Thread>
<Thread>
<Gender>external</Gender>
<Class>3A</Class>
<MajorDia>1.9964</MajorDia>
<PitchDia>1.9716</PitchDia>
<MinorDia>1.9504</MinorDia>
</Thread>
<Thread>
<Gender>internal</Gender>
<Class>3B</Class>
<MajorDia>2.0</MajorDia>
<PitchDia>1.9746</PitchDia>
<MinorDia>1.9599</MinorDia>
<TapDrill>1.961</TapDrill>
</Thread>
</Designation>
</ThreadSize>