What are the differences between cylindrical roller bearings N, NU, NF and NJ?

Cylindrical roller bearings are the simplest type of roller bearings with a construction featuring inner and outer rings in line contact with the rollers. They have a high radial load capacity and are suitable for high-speed rotation. Cylindrical roller bearings are separable, making installation and disassembly relatively simple.
The basic forms include: N, NU, NF, NJ, and NUP.

N type: The inner ring has double ribs and is inseparable from the rollers, while the outer ring has no ribs and can be freely detached from both sides.
NU type: The outer ring has double ribs and is inseparable from the rollers, while the inner ring has no ribs and can be freely detached from both sides.
NF type: The inner ring has double ribs and is inseparable from the rollers, while the outer ring has a single rib and can only be freely detached from one side.
NJ type: The outer ring has double ribs and is inseparable from the rollers, while the inner ring has a single rib and can only be freely detached from one side.
NUP type: The outer ring has double ribs and is inseparable from the rollers, while the inner ring has a single rib and can be freely detached from one side, but the inner ring has a locating ring on one side that can be removed.
Cylindrical roller bearings also include double-row NN and NNU types, as well as four-row cylindrical roller bearings. Cylindrical roller bearings generally use pressed steel cages, while larger sizes or those used for high-speed rotation use machined brass cages. Double-row or four-row cylindrical roller bearings use pin-type cages to extend the bearing's service life.
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