RHP7211RCTSULP2Super-Precision Angular Contact Ball Bearing – 55 mm ID, 100 mm OD, 21 mm Width, Open, 15° Contact Angle, Light Preload, Phenolic Cage, ABEC 9

Product Description

What this part is

RHP 7211RCTSULP2 is a super-precision single-row angular contact ball bearing, 55 mm bore, 100 mm outside diameter, 21 mm width, ground for single universal matching at ABEC 9 tolerance.

Decoding the designation

The carton carries three numbering schemes for the same bearing: the RHP form 7211 R C T SUL P2, the Fafnir form 2MM211WOCRSUL, and the RHP B-series form 7211RX2-TAU-EP9. Read together, RHP C, Fafnir 2MM and B-series X2 all state a 15° contact angle, and EP9 restates P2 as ABEC 9. T is a phenolic cage, corroborated by the Fafnir CR code for a phenolic outer-ring land-riding cage. SU is single universal grinding and L is light preload.

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 thrust capacity. Light preload keeps the bearing stiff enough for accurate positioning while limiting heat generation, which is why it is the common choice for higher-speed spindle positions. ABEC 9 is the tightest tolerance grade in ordinary industrial use, controlling bore, outside diameter and both radial and axial runout more closely than ABEC 7. The phenolic cage rides the outer ring land, holds oil in its fabric base and runs quietly at speed.

Quantity and configuration

One bearing, ground as a single universal. A single universal bearing can be combined with further bearings of the same designation in back-to-back, face-to-face or tandem arrangements, and the ground offsets produce light preload in any of them.

Fitting notes

Preloaded and clearance-set are mutually exclusive, so no internal clearance class applies. Faces are ground so that the specified preload is realised when the rings are clamped solid.

Interchange guidance

NSK 7211CTRSULP2 and Fafnir 2MM211WOCRSUL are same-spec interchanges, both 15° light-preload single universals with phenolic cages. SKF 7211 ACD/P4A shares the 55 x 100 x 21 mm envelope but carries a 25° angle, making it a related size rather than a substitution.