RHP7220ETSULP4Super Precision Angular Contact Ball Bearing – 100 mm ID, 180 mm OD, 34 mm Width, Open, 25° Contact Angle, Light Preload, Universally Ground

Product Description

What this part is

RHP 7220ETSULP4 super precision angular contact ball bearing. Bore: 100 mm. Outside diameter: 180 mm. Width: 34 mm. Series: 72, ISO dimension series 02. Single-row angular contact ball bearing, open, universally ground for use singly or matched with another bearing of the same designation.

Decoding the designation

Contact Angle: 25°. Cage: machined laminated phenolic, outer-ring guided. Grouping: SU, single universal. Preload: Light, 1,570 N axial. Precision Grade: P4, equivalent to EP7, ABEC 7 and ISO Class 4. The same bearing carries the designations B7220X3-TA-UL-EP7, 3MM220WI CR SUL, 7220A5 and 7220AC.

What these specs mean in practice

Dynamic radial load rating (Cr): 142,000 N. Static radial load rating (C0r): 121,000 N. Axial stiffness at light preload: 325 N/µm. A 25° contact angle carries more thrust and gives greater axial stiffness than a 15° bearing of the same envelope, at a lower speed ceiling. The 72 dimension series is the heavy section, so this bearing carries the highest radial and axial load of the three super precision series at a 100 mm bore. Limiting speed: 10,500 rpm on oil/air, 6,900 rpm on grease. Maximum recommended operating temperature: 120 °C. Rings and balls are through-hardened carbon chrome bearing steel to SAE 52100.

Quantity and configuration

1 Pc. Universal face control means the inner and outer rings are the same width and the faces are adjusted at manufacture, so two of these bearings clamp up to the light preload value back-to-back or face-to-face without custom spacers, and share load equally in tandem.

Fitting notes

Shaft abutment diameter (d1): 112 mm minimum. Housing abutment diameters: D1 168 mm maximum, D2 173 mm maximum. Maximum shaft fillet radius: 2.5 mm. Maximum housing fillet radius: 1.5 mm. Effective load centre (a): 130.6 mm. Internal volume for grease charging: 139.2 cm³. Mass: 3.17 kg. The high point of radial runout is marked by a burnished spot on the inner ring face and by a V line on the outer ring outside diameter; the V line also shows the direction of the contact angle.

Interchange guidance

Matching 25°, light-preload, P4 universal bearings: SKF 7220 ACDGA/P4A, FAG B7220-E-T-P4S-UL, NSK 7220A5TRSULP4, Fafnir 3MM220WI CR SUL. The 15° version of the same size, 7220CTRSULP4, carries less thrust and is not a drop-in.