propane tanks have left-hand threads.
The simple answer is left handed threads are the opposite of right handed threads. If you have heard the old adage "Righty tighty, Lefty loosey" left handed threads are the "Lefty tighty, Righty loosey". Left handed threads are used for keeping counter clockwise rotating assemblies from coming loose.
Standard right hand thread.
no, threads are right handed.
In plumbing we use BOTH right and left handed threads depeng on the useage Toilet handles for example are left handed threads threaded rod used for clevis hangers and riser clamps are right handed threads
they are right hand threads
I doubt it.
Standard rh threads
the crank pulley bolt has standard threads.
If the grass exits the right side of the deck, then the threads are normal right handed treads. If the grass exits the lefts side of the deck, then the bolts thread are left handed threads.