- twitter.com theoreticalmachTheoreticalMachinist. @TheoreticalMach. · Jan 18, 2012.
- twitter.com ArvindRathod186UN imperial screw thread calculator http://theoreticalmachinist.com/Threads_UnifiedImperial.aspx…
- twitter.com ArvindRathod186/status/…UN imperial screw thread calculator http://theoreticalmachinist.com/Threads_UnifiedImperial.aspx…