RHPSuper-Precision Angular Contact Ball Bearing Pair – 55 mm ID, 90 mm OD, 18 mm Width Each, 25° Contact Angle, Phenolic Cage, Medium Preload, ABEC 7

Product Description

What this part is: An RHP 7011-E-T-DUM-P4 super-precision angular contact ball bearing, supplied as a matched pair. Bore 55 mm, outside diameter 90 mm, width 18 mm per bearing, 36 mm across the assembled pair. Open on both faces, with a phenolic cage. Decoding the designation: In the RHP scheme the E denotes a 25° contact angle, T the phenolic cage, DUM a universally matchable duplex pair at medium preload, and P4 the ABEC 7 precision class. The carton also carries B7011X3-TA-DUM-EP7, where X3 is the same 25° angle and EP7 the same ABEC 7 class, and Fafnir 3MM9111WI-CR-DUM as the Timken designation. What these specs mean in practice: A 25° contact angle carries more thrust and tolerates less speed than a 15° bearing of the same envelope, which suits it to spindles and screw drives where axial stiffness governs. Medium preload sits between the light grade, chosen for speed, and the heavy grade, chosen for stiffness. Because the pair is preload-set rather than clearance-set, internal clearance is not applicable to it. Quantity and configuration: Two bearings, sold as a matched set. Universally matchable duplex construction allows the pair to be mounted back-to-back, face-to-face or in tandem, the ground faces producing the specified medium preload when clamped. Fitting notes: The rings are ground as a set and stay together. Clamping is applied evenly against the ground faces so the designed preload is established without ring distortion. Interchange guidance: Cross-references are SKF 7011 ACD/P4ADGC (medium preload), FAG B7011-E-T-P4S-DUM and Fafnir 3MM9111WI-CR-DUM. A 7011 CD or 7011-C variant shares the 55 x 90 x 18 mm envelope at a 15° contact angle, so it is a different bearing.