NNU4920-S-K-M-SP
Holding a bearing marked SKF NNU4920BK/SPW33 or NSK NNU4920K or FLT NNU4920K? Ours is NNU4920-S-K-M-SP — the same seat size, the same type and the same sealing and clearance design.
What this bearing is
NNU4920-S-K-M-SP is a cylindrical roller bearing with a 100 × 140 × 40 mm seat, execution: open. The manufacturer's cross-reference catalogue confirms full interchangeability for 4 designations, including SKF NNU4920BK/SPW33, NSK NNU4920K, FLT NNU4920K.
Designation equivalents
⌀100 × 140 × 40 mm
Before you replace it
This is a dimensional and design equivalent: the same seat size, the same bearing type and the same sealing and clearance design. It is not the same product — load ratings, tolerance class and grease may differ between manufacturers. For duty close to the limits or a critical application, check the datasheet of the specific design.
Where these equivalents come from
The base number of a standard bearing is an ISO standard — 6205 is 6205 at every manufacturer. Only the suffixes describing the design differ, and those are what we translate: shields, contact seals, cage and radial clearance. Designations that mean different things at different makers are deliberately omitted.