Electric motors are essentially the same worldwide in spite of the fact that they are governed by two different organizations. Motors in North America are governed by standards of the National Electrical Manufacturers Association (NEMA), while the rest of the world follows the standards created by the International Electrotechnical Commission (IEC).
While the chart in this post shows some similarities between the frame sizes, they are not interchangeable without making modifications to the mounting location. IEC shaft dimensions are metric which will generally result in pulley or coupling changes.
NEMA three phase induction motors use the testing standards of IEEE 112b and CSA 390-10 and IEC standard is 60034-2-1. These standards are now all harmonized together.
While NEMA and IEC motors are similar in size and frame, NEMA frames use the imperial method (inches, feet and pounds) and IEC motors use the metric system (millimeters, centimeters and kilograms). Add to that the NEMA rates motors by horsepower and IEC uses the kilowatt, you see that while there are similarities, they are not interchangeable.
Contact your Flolo Sales Rep today for help in interchanging from an IEC frame to a NEMA frame.