What is the difference between the bearings series MR (e.g MR1314EB_EL_EX )and series NJ (e.g NJ 314 E ...)? Can I used the bearing series NJ instead series MR for screw compressors? Thank you for help.
From what I can see the "MR***EL" part numbering is specific to Bower Bearing, while "NJ..." is an AFBMA standard numbering system used in the bearing industry. Both part numbers describe a cylindrical roller bearing configuration having a dual flange outer race and a single flange (separable) inner race.
You'll have to check the manufacturer's published performance data for each specific bearing part number to determine whether it is suitable for your screw compressor application.