RHP7218CTBDULAngular Contact Ball Bearing – 90 mm ID, 160 mm OD, 30 mm Width, Open, 15° Contact Angle, Phenolic Cage, Duplex Universal Light Preload Pair, P0 Class

Product Description

What this part is

RHP 7218CTBDUL angular contact ball bearing. Series: 7200. Bore: 90 mm. Outside Diameter: 160 mm. Width: 30 mm. Contact Angle: 15°. Single row, open, universally ground and matchable. Also written 7218C-TB-DUL-P0, 7218 C TB DUL and 7218CTBDULP0.

Decoding the designation

C: 15° contact angle. DUL: duplex pair, universally ground, light preload. P0: EP1, equivalent to ABEC 1, normal tolerance class. The carton carries three schemes at once — RHP 7218C, RHP B-series B7218X2TADULEP1 and Fafnir 2MM218WICRDUL — and all three give the same 15° angle, with EP1 and P0 the same class.

What these specs mean in practice

Basic Dynamic Load Rating: 155 kN per bearing. Basic Static Load Rating: 105 kN per bearing. Permissible Axial Load: 72.0 kN. A 15° contact angle favours speed and radial stiffness over thrust capacity. Limiting speed for this 15° 7218 envelope runs to 9,200 rpm on grease and 14,000 rpm on oil or oil-air lubrication. The phenolic cage is light and self lubricating and holds ball guidance steady to 120 °C. P0 normal class delivers the geometry and preload of a matched pair at a standard tolerance, which suits general machine tool and gearbox positions where the running accuracy of a P4 spindle set is not required.

Preload and rigidity

Light preload, 771 N across a back-to-back or face-to-face pair, giving 126 N/µm axial rigidity and 29 µm measured axial clearance. Effective Load Center a: 31.7 mm.

Quantity and configuration

Two bearings, supplied as a universally ground duplex pair at light preload. Universally ground rings mount back-to-back, face-to-face or in tandem, with the preload set by the ground ring faces.

Fitting notes

Diameter of Shaft Abutment, da min: 100 mm. Diameter of Housing Abutment, Da max: 150 mm and Db max: 154 mm. Radius of Shaft or Housing Fillet, ra max: 2 mm, rb max: 1 mm. Bearing chamfer r min: 2 mm, r1 min: 1 mm. Recommended grease quantity: 12 g per bearing.

Interchange guidance

ISO base number 7218. Same 15° angle and envelope: Fafnir 2MM218WICRDUL, NSK 7218CTRDULP4, SKF 7218 CD/P4ADGA, Barden 218HDL. The RHP part is a P0 class execution, so the P4 designations listed are the same geometry at a tighter tolerance class. Related size at a 25° angle: RHP 7218ETDULP4.