Fafnir2MM213WNCRSuper-Precision Angular Contact Ball Bearing, 65x120x23 mm, 15° Contact Angle, Phenolic Outer-Land-Riding Cage, P4S

Product Description

What this part is

A single-row Fafnir super-precision angular contact ball bearing, 65 mm bore by 120 mm outside diameter by 23 mm wide — the 72-series envelope corresponding to metric 7213. Fafnir precision bearings are now supplied under the Timken brand.

Decoding the designation

2MM — Fafnir/Timken world-number prefix for a 15° contact angle. The MM prefix also implies P4S accuracy rather than plain P4
213 — 72-series envelope, 65 mm bore (metric 7213)
CR — fabric-reinforced phenolic cage, riding on the outer ring land
WN — a Fafnir internal-execution suffix with no published decode. It is retained as a search term rather than interpreted

Note what is absent: there is no SU, DU, SUL, DUL, DUM or DUH group in this number, so the bearing is not designated as a preload-matched single or as part of a duplex set. Treat it as an unmatched single bearing unless the ring etching says otherwise.

Correcting the source data

The description was entirely eBay boilerplate — a contact-us call to action, shipping and carrier promises, price guarantees — with no product information in it. It has been replaced. No country of origin is claimed, because none is documented for the item in hand.

What these specs mean in practice

The 15° contact angle is the high-speed, low-friction end of the range: excellent radial stiffness, cool running, modest axial capacity. The outer-land-riding phenolic cage is the reason precision spindle builders choose bearings like this one — light, quiet, self-lubricating, and guided on the stationary outer ring so it stays centrifugally stable at speed. Phenolic caps operating temperature in exchange. Because a 15° bearing generates an axial reaction under radial load, it must always be opposed by a second bearing; it cannot work alone.

Published ratings and mounting data

No manufacturer-published basic dynamic or static load rating could be verified for this exact designation, so none is quoted rather than borrowed from a differently caged 7213. Boundary dimensions 65 x 120 x 23 mm are the ISO 72-series values and are confirmed.

Interchange guidance

Metric-scheme equivalent: 7213C-T-P4S (also written 7213 C T P4S). Same-envelope 15° super-precision bearings include NSK 7213CTYNSULP4, NTN 7213CGD2GLP4 and SKF 7213 CDGA/P4A. A 3MM213 prefix would be the 25° version of the same envelope — it will fit and it will change your spindle’s stiffness and speed limit, so do not treat the two as interchangeable.