Cylindrical roller bearings

When a shaft carries heavy radial load and the arrangement has to stay stiff, cylindrical roller bearings are the usual answer: each roller touches the raceways along a line rather than at a point. In many series one ring comes off the rest of the bearing, so you can give both rings an interference fit and still mount and dismount them easily. Typical machines include gearboxes, electric motors, pumps, fans and machine tools.

Read the first letter of the designation to see where the ribs sit. N and NU carry radial load only and let the shaft float axially against the housing; NJ locates the shaft in one direction, and NUP locates it in both. The digits in NU209 or NU2209 combine the dimension series with the size, and from size 04 up, the last two digits times 5 equal the bore in millimeters (NU209: 45 mm). Suffixes on part numbers like N 203 ECP, NU209EA, NU2207ET or NU1007(M) mark the internal design or cage, so two bearings that differ only in suffix are not swappable. We always quote the full part number.

Start the selection with radial load and speed, then decide how the shaft is supported. With one locating and one non-locating position, put an NJ or NUP at the locating end and an NU or N at the other, where it takes up thermal growth. Misalignment tolerance is small, so check that the shaft and housing seats are concentric, and ask about radial internal clearance (C3, for example) when the inner and outer rings run at different temperatures.

Brands we carry here: SKF, NTN, FAG, NSK and Link-Belt, including designs such as FAG LSL192316 and the Link-Belt series 1000 and series 1200. Message us on WhatsApp with the full part number, or with bore, outside diameter and width plus the brand now installed. We'll quote it and give you the cross-reference to other brands.