Hi,
NEMA 24???...there is no such size.
NEMA23 yes, that is a size standardized by the National Electrical Manufacturers Association. This is a US based association and has no sway outside of the US.
In order to maximize sales opportunities many manufacturers', US and elsewhere, manufacture the 23 size. The '23' refers to 2.3 inches across the flats
or 58.42mm.
Other manufacturers, mainly European, Japanese and other Asian countries which are metricized have adopted a size of 60mm across the flats.
A 60mm motor does not quite fit into the hole that a 23 size motor came out of, and likewise trying to fit a 23 size motor into the hole a 60mm motor
came out of is not easy either. The bottom line is that you buy either a 23 size motor OR a 60mm motor depending on the dimensions of your machine.
60mm=2.362 inch, or with rounding becomes 24. It has become common practice to say NEMA24....when there is no official 24 size in the Nation Electrical Manufacturers
Association literature. What is actually being referred to is a 60mm motor.
If you ask a simple question, you'll get a simple answer.....questions scattered all over the spectrum less so.
Craig