RHPSuper-Precision Angular Contact Ball Bearing – 60 mm ID, 110 mm OD, 22 mm Width, Open, 15° Contact Angle, Heavy Preload, Phenolic Cage, Universally Matchable Pair

Product Description

What this part is

RHP 7212CTDUHP4 is a super-precision single-row angular contact ball bearing, supplied as a universally matchable set of two. Bore: 60 mm (2.3622 in). Outside Diameter: 110 mm (4.3307 in). Overall Width: 22 mm (0.8661 in) per bearing. Total Width: 44 mm (1.7323 in) for the pair. Series: 7200. Base Number: 7212. Bore Type: Straight. Closure Type: Open. Bearing Material: Chrome steel. Rolling Elements: Ball.

Decoding the designation

Series: ISO 72, bore code 12, giving a 60 mm bore. Contact Angle: 15°. Cage Material: Phenolic. Cage Type: Outer-ring land riding. Arrangement / Configuration: Duplex universal matched pair (DU). Preload: Heavy (DUH). Precision Class: P4, equal to ABEC 7. The carton also carries the Fafnir designation 2MM212WICRDUH and the RHP B-series form 212HDH.

What these specs mean in practice

A 15° contact angle favours speed and radial stiffness over thrust capacity; a 25° equivalent in the same envelope carries more axial load and less speed. Heavy preload raises axial and radial stiffness and holds shaft position under cutting load, which suits a machine tool spindle where positional accuracy governs. The phenolic cage rides on the outer ring land, runs quietly and holds oil in its fabric base, the usual choice for oil-lubricated spindle service. Max Temp: 120 °C. Min Temp: -30 °C. Lubricant: Oil.

Load ratings and speed

Dynamic Load Rating: 80.5 kN per bearing. Static Load Rating: 49.0 kN per bearing. Permissible Axial Load: 34.0 kN. Limiting Speed: 13,600 rpm on grease and 20,600 rpm on oil or oil-air. Effective Load Centre: 22.4 mm. Chamfer Dimensions: r 1.5 mm minimum, r1 1.0 mm minimum. Item Weight: 0.780 kg (1.72 lb) per bearing.

Quantity and configuration

Unit Quantity: 2 Pcs, one universally matchable pair. Universal matching means the pair assembles back-to-back, face-to-face or in tandem, with the ground preload realised in any of those arrangements. Internal Clearance: N/A — the set is preloaded.

Interchange guidance

Same-spec interchanges are SKF 7212 CD/P4ADGC, NSK 7212CTYNDUHP4 and Fafnir 2MM212WICRDUH, all 15° heavy-preload universal pairs. SKF 7212 ACD variants share the envelope and carry a 25° angle, making them a related size.