RHP7224ETDULP5Super-Precision Angular Contact Bearing – 120 mm ID, 215 mm OD, 40 mm Width, Open, 25° Contact Angle, Matched Duplex Pair

Product Description

What this part is

RHP 7224ETDULP5 super-precision angular contact ball bearing. Bore: 120 mm. Outside diameter: 215 mm. Width: 40 mm per bearing. Series: 7200. Contact angle: 25°. Precision Class: P5 (ABEC 5, RHP EP5). Open on both faces, machined phenolic cage. Country of origin as recorded on this listing: United Kingdom.

Decoding the designation

7224 = 72 series, 120 mm bore. E = 25° contact angle in RHP’s legacy scheme, written X3 in the RHP B-series form and 3MM in the Fafnir form on the same carton. T = machined fabric-base laminated phenolic cage, rated to 120 °C. DUL = universally matchable duplex pair, light preload. P5 = ABEC 5, the RHP EP5 class. Searchable forms: 7224ETDULP5, 7224-E-T-DUL-P5, 7224 E T DUL P5, B-7224-E-T-P5-DUL, 7224X3.

What these specs mean in practice

A 25° contact angle carries substantially more thrust than the 15° execution of the same envelope, at a lower speed ceiling. Permissible axial load reaches 150 kN here. The phenolic cage keeps mass and friction low and tolerates oil-air and grease lubrication equally. P5 precision holds runout tighter than a standard-class bearing, which lowers running vibration and improves shaft location.

Load ratings and speed

Basic dynamic load rating Cr: 238 kN (53,500 lbf) per bearing. Basic static load rating C0r: 184 kN (41,350 lbf) per bearing. Permissible axial load Pa: 150 kN. Limiting speed: 6,000 rpm on grease and 9,000 rpm on oil or oil-air. Effective load centre a: 59.1 mm. Mass: 5.42 kg (11.95 lb) per bearing.

Quantity and configuration

Two pieces ship, matching the DUL duplex designation. Rings are universally ground, so the pair mounts back-to-back, face-to-face or in tandem. Light preload as supplied: 2,327 N with an axial rigidity of 412 N/µm in a DB or DF pair.

Fitting notes

Shaft abutment diameter da: 132 mm minimum. Housing abutment diameters Da 203 mm and Db 208 mm maximum. Shaft and housing fillet radii ra 2 mm and rb 1 mm maximum. Chamfer dimensions r 2.1 mm and r1 1.1 mm minimum. Recommended grease charge: 29 g per bearing. As a preloaded matched pair the bearings carry no running clearance, so the internal clearance field reads N/A.

Interchange guidance

Direct equivalents at the same 25° angle and light preload: NSK 7224A5TRDULP5, SKF 7224 ACD/P5A, FAG B7224E.T.P5.UL. Related size: 7224CTR shares the 120 x 215 x 40 mm envelope at a 15° contact angle, which raises the speed ceiling and cuts thrust capacity, so it is a different part rather than a substitution.