RHP7206ETTULP4Super-Precision Angular Contact Ball Bearings – 30 mm ID, 62 mm OD, 16 mm Width, Open, 25° Contact Angle, Phenolic Cage, Light Preload, 3 Pcs

Product Description

What this part is

RHP 7206ETTULP4 super-precision angular contact ball bearings, single row, open. Bore: 30 mm. Outside diameter: 62 mm. Width: 16 mm. Contact angle: 25°. Precision: EP7, equivalent to ABEC 7 and ISO Class 4. Series: 72, light section.

Decoding the designation

7206: 30 mm bore in the ISO 72 dimension series. E: 25° contact angle. T: machined laminated phenolic cage, outer-ring guided, rated to 120 °C. TUL: triple universally ground set at light preload. P4: EP7 precision, ABEC 7. The carton also carries the RHP B-series form 7206X3TADULEP7, where X3 is the same 25° angle, and the Fafnir equivalent 3MM206WI CR TUL, where 3MM is again 25°.

Published ratings

Basic dynamic load rating Cr: 27.8 kN. Basic static load rating C0r: 14.1 kN. Permissible axial load Pa: 12.0 kN. Limiting speed: 21,800 rpm on grease, 32,700 rpm on oil or oil-air. Effective load centre a: 18.7 mm. Light preload: 202 N, giving 108 N/µm axial rigidity across a back-to-back or face-to-face pair. Mass: 0.194 kg (0.43 lb) per bearing. Recommended grease charge: 1.2 g per bearing.

What these specs mean in practice

A 25° contact angle carries substantially more thrust than a 15° bearing on the same envelope and trades away some speed for it, which is why it is the usual choice where the spindle sees heavy axial cutting load. The machined phenolic cage is outer-ring guided and takes 120 °C, and its low mass is what allows the 32,700 rpm oil-air figure against 21,800 rpm on grease. Light preload gives 108 N/µm of axial stiffness per pair while keeping running torque and heat low.

Quantity and configuration

Three pieces. Universally ground, so the three mount as a TUL triple set, or in any back-to-back, face-to-face or tandem combination, and reach light preload on assembly without shims.

Fitting notes

Shaft abutment diameter da: 36 mm minimum. Housing abutment diameters Da: 56 mm maximum, Db: 57 mm maximum. Fillet radii: ra 1 mm maximum, rb 0.5 mm maximum. Chamfer dimensions r 1 mm minimum, r1 0.6 mm minimum.

Interchange guidance

NSK 7206A5TRSULP4 is the same bearing in NSK’s current scheme, since NSK owns RHP: A5 is the 25° angle, TR the outer-ring-guided phenolic cage. Also same spec: Fafnir 3MM206WI CR, SKF 7206 ACD/P4A, FAG B7206E.T.P4S. Related size at a different angle, not a substitute: 7206C and 7206X2, both 15°.