RHP7205ETSUMP4Super-Precision Angular Contact Ball Bearing – Straight Bore, 25 mm ID, 52 mm OD, 15 mm Width, Open, 25° Contact Angle, Phenolic Cage, Medium Preload, Single Universally Ground

Product Description

What this part is

RHP 7205ETSUMP4 super-precision single-row angular contact ball bearing, 25 mm bore, 52 mm outside diameter, 15 mm width. Steel balls, phenolic cage, open on both faces, straight bore.

Decoding the designation

72 is the ISO dimension series and 05 is the bore code — 5 × 5 = 25 mm. In the RHP scheme the E is a 25° contact angle, the T is a phenolic cage, SU marks a single universally ground ring, M calls medium preload and P4 is the tolerance class, equal to ABEC 7. The carton’s second designation, 7205X3TAUMEP7, reads the same bearing in RHP’s B-series codes: X3 is 25° and EP7 is again ABEC 7, so the two markings cross-confirm both the angle and the class.

What these specs mean in practice

A 25° contact angle carries substantially more thrust than a 15° ring of the same envelope and runs at a lower limiting speed. Medium preload sits between the light class used for maximum speed and the heavy class used for maximum stiffness, and it is the usual choice for a general precision spindle. The phenolic cage is rated to 120 °C and tolerates thin oil films.

Thrust direction and arrangement

One row of angular contact balls takes thrust in a single direction, toward the high shoulder of the outer ring. Universal grinding lets any two of these rings be set back-to-back, face-to-face or in tandem with no shimming. Back-to-back and face-to-face pairs locate the shaft in both directions; a tandem pair stays one direction and shares the load.

Quantity and configuration

1 Pc. Single bearing, universally ground, medium preload class.

Fitting notes

The orientation mark on one ring face determines which arrangement results when two rings are stacked. Preload is consumed by interference, so shaft and housing seats are ground to spindle tolerances rather than to nominal 25 mm and 52 mm.

Interchange guidance

Same-spec single-universal equivalents at 25°, medium preload and ABEC 7 are the FAG B7205-E-T-P4S-UM and the SKF 7205 ACDGB/P4A. The Timken Fafnir 3MM205WI CR DUM is the same 25° geometry supplied as a duplex pair, and the NSK 7205A5TYNSUMP4 carries a polyamide cage instead of phenolic; both are related designations rather than drop-in substitutions. A 7205C or plain 7205 of this envelope carries a different contact angle and is a related size.