RHP7220CTRSULP4Super Precision Angular Contact Ball Bearing – 100 mm ID, 180 mm OD, 34 mm Width, 15° Contact Angle, Light Preload, P4

Product Description

What this part is

RHP 7220CTRSULP4 super precision angular contact ball bearing. Series: 72, ISO dimension series 02. Bore: 100 mm. Outside Diameter: 180 mm. Width: 34 mm. Country of origin: United Kingdom. Searchable forms: 7220CTRSULP4, 7220-C-TR-SUL-P4, 7220 C TR SUL P4, 7220CD SUL, and the carton cross-references 2MM220WI-CR-SUL and B7220C.

Decoding the designation

Contact Angle: 15°. Cage: TR, laminated phenolic resin, outer ring guided. Grouping: SU, a single universally ground bearing. Preload: Light, 980 N axial when paired. Precision Grade: P4 — ABEC 7, RHP EP7, ISO Class 4.

What these specs mean in practice

Dynamic Load Rating: 149,000 N. Static Load Rating: 127,000 N. Limiting speed: 12,000 rpm on oil/air, 7,500 rpm on grease. The 72 section is the heaviest of the three super precision series, so a 7220 carries markedly higher load than a 7020 on the same 100 mm bore. A 15° contact angle carries more speed and less thrust than a 25°. Light preload gives a paired axial stiffness of 137 N/µm. The laminated phenolic cage runs quietly at speed and is rated to 120 °C.

Quantity and configuration

One bearing. Universal grinding means any two of these bearings form a matched pair at the light preload value, in back-to-back, face-to-face or tandem order.

Fitting notes

Effective load centre: 35.7 mm. Abutment dimensions: shaft shoulder 112 mm maximum, housing shoulder 168 mm minimum, outer ring abutment 173 mm maximum. Corner radii: 2.5 mm minimum outer, 1.5 mm minimum inner. Recommended shaft fit at P4 for a 100 mm seat is a mean 3 µm interference; a locating housing bore takes a mean 7 µm clearance. Internal free volume is 139.2 cm³, which sets the grease charge at 20 to 30 per cent fill. The high point of radial runout is marked by a burnished spot on the inner ring face and a V line on the outer ring diameter.

Interchange guidance

Matching 15° light-preload P4 universal bearings: SKF 7220 CDGA/P4A, FAG B7220-C-T-P4S-UL, Fafnir 2MM220WI-CR-SUL. The 7220A5TRSUL is the same size at 25°, carrying more thrust at a lower speed. The 7020CTRSUL is the lighter 70-series bearing on the same bore, with a smaller outside diameter.