Cylindrical Roller Bearings
Line contact between roller and raceway gives very high radial capacity and stiffness. Separable designs also let the shaft grow axially inside the bearing, which is why they sit on gearbox and motor shafts that run hot. SES holds the range as an authorised SKF distributor, covering bore range 17 mm to 1060 mm; designs NU, NJ, NUP, N, NF, and four-row types; rows Single, double and four-row executions; cage Pressed steel, polyamide, machined brass. Executions include single row cylindrical roller bearings, high-capacity single row cylindrical roller bearings, double row cylindrical roller bearings, four-row cylindrical roller bearings, among others. It is specified most often into traction and mill motor non-drive ends and gearbox intermediate and output shafts. Every part is genuine SKF through official channels, with designation, specification and options confirmed against your duty before it ships — supplied from Kolkata and our branch network, with breakdown cover that does not sit in an inbox.
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Load
Very high radial; axial only on flanged designs
Speed
High — above spherical, below deep groove ball
Axial movement
NU and N types float freely
Misalignment
Minimal — requires accurate seats
Where it runs.
You will find Cylindrical Roller Bearings in the parts of a plant where this particular duty actually occurs. In practice that means traction and mill motor non-drive ends, gearbox intermediate and output shafts, rolling mill roll necks in four-row execution, and equally large fan and blower shafts, machine tool spindles in double row precision form, generator bearing positions. What links them is the duty rather than the machine name — load: Very high radial; axial only on flanged designs. If your installation is not on that list it matters less than you would think: the operating condition decides the specification. Send us the load, the speed, the running temperature and the environment it runs in, and we will match it to the right execution in the SKF range and confirm what is in stock.
Specify it against the duty.
Specification here follows the operating condition, not the catalogue. Shaft grows axially between two bearing positions — NU or N design at the floating end — the rollers travel on the flangeless ring instead of loading the shoulder. Radial load with an intermittent light thrust — NJ or NUP design, which can locate the shaft in one or both directions through the flanges. Rolling mill roll neck carrying very heavy radial load — Four-row cylindrical roller bearing, matched as a set to the neck. Where two of those apply at once, specify for the harsher of the two — under-specifying is what puts the part back on the bench a month later. Send us the duty and we will confirm the execution.
Ordering this from SES.
A cylindrical roller bearing will not tolerate an out-of-line housing. If you are replacing one that failed early with heavy end-wear on the rollers, check the housing bore alignment before fitting the new bearing — the bearing was the symptom.