SKF7212CD/P4ADGASuper-Precision Angular Contact Ball Bearing – 60 mm ID, 110 mm OD, 22 mm Width, Open, 15° Contact Angle, Light Preload, Phenolic Cage, Universally Matchable Set of 2

Product Description

What this part is

SKF 7212 CD/P4A DGA is a super-precision single-row angular contact ball bearing, 60 mm bore, 110 mm outside diameter, 22 mm width, supplied here as a universally matchable set of two.

Decoding the designation

In SKF’s super-precision scheme 7212 is the ISO 72 series size, CD is a 15° contact angle with a machined phenolic cage guided on the outer ring land, P4A is the SKF super-precision tolerance and running-accuracy grade equivalent to ABEC 7, and DGA is the light step of SKF’s universal-matching preload ladder. The carton also carries the Fafnir designation 2MM212WICRDUL: Fafnir 2MM is likewise 15°, CR is a phenolic outer-land-riding cage, and DUL is a duplex universal set at light preload, so angle, cage and preload are each confirmed twice from the carton alone.

What these specs mean in practice

A 15° contact angle favours speed and radial stiffness; a 25° bearing in the same envelope trades speed for axial capacity. Light preload is the usual choice where speed and thermal stability matter more than maximum stiffness, since preload magnitude drives frictional heat directly. The machined phenolic cage is light, quiet at speed and holds oil in its fabric base, which is why SKF specifies it for oil-lubricated machine tool spindle positions.

Quantity and configuration

Two bearings, ground as a universally matchable set. A DGA suffix states the preload magnitude the set will develop, not the direction it must face: the pair may be assembled back-to-back, face-to-face or in tandem, and reaches light preload in whichever arrangement is chosen.

Load ratings and how they are quoted

Per bearing the basic dynamic load rating is 57.3 kN and the basic static load rating 46.5 kN. For the two-bearing set arranged back-to-back or face-to-face the dynamic rating is 93.6 kN and the static rating 93 kN, following the standard set factors. The set figures apply only when both bearings are mounted together.

Fitting notes

Preloaded and clearance-set are mutually exclusive, so no internal clearance class applies. Ring faces are ground to develop the DGA preload once clamped solid, so the two rings are clamped against each other rather than shimmed apart.

Interchange guidance

Fafnir 2MM212WICRDUL and FAG B7212C.T.P4S.DUL are same-spec interchanges, both 15° light-preload universal sets with phenolic cages. SKF 7212 CDGB/P4A and CDGC/P4A share the envelope and angle but sit at medium and heavy preload, and SKF 7212 ACD/P4A carries a 25° angle, so all three are related sizes rather than substitutions.