Where can I get information on the various different types of threads used in bike pedals as each manufacture has its own specifications? Different manufactures of pedals have different threads and I need the design and specification for the pedals to not strip the threads, etc.
Just about all pedals for bicycles will use the same threads. According to Sheldon brown the standard size is 9/16" x 20 tpi threads. One piece "American" cranks use 1/2" x 20 tpi threads, but these are only found on low end bikes and children's bikes. There's been a couple other sizes used in the past, but almost all modern bicycles will use the two above sizes.
It's also worth noting that the left hand pedal uses a reverse (counter-clockwise) thread to prevent it from loosening on it's own when pedaling. The right hand pedal uses a standard (clockwise) thread.