RHP7018CTDUHP4Super Precision Angular Contact Ball Bearing – Straight Bore, 90 mm ID, 140 mm OD, 24 mm Width, Open, 15° Contact Angle, Heavy Preload, ABEC 7 / P4

Product Description

What this part is

RHP 7018CTDUHP4 super-precision single-row angular contact ball bearing. Bore: 90 mm. Outside Diameter: 140 mm. Width: 24 mm. Contact Angle: 15°. Precision Class: P4, equivalent to ABEC 7 and ISO Class 4. Dynamic Load Rating: 71.5 kN. Static Load Rating: 69 kN. Cage Material: Laminated phenolic resin. Cage Type: Outer ring guided. Bore Type: Straight. Closure Type: Open. Rolling Elements: Steel balls. Number Of Rows: 1. Series: 7000, ISO dimension series 10.

Decoding the designation

7018 is the type and size: single-row angular contact, ISO dimension series 10, bore code 18 for a 90 mm bore. C sets the contact angle at 15°. T is the outer-ring-guided laminated phenolic resin cage. DU marks a universally ground paired unit. H sets heavy preload. P4 is the precision grade.

What these specs mean in practice

Limiting Speed: 14,600 r/min on oil-air lubrication and 8,700 r/min on grease. The two figures are the published pair for a single bearing under light external load. A 15° contact angle favours speed and radial stiffness, where a 25° angle in the same envelope trades speed for axial capacity. Preload: Heavy, 2,350 N axial. Axial Stiffness: 242 N/µm. Internal Clearance: N/A, as preload and mounted clearance are set against one another. Maximum operating temperature for a laminated phenolic resin cage is 120 °C. Item weight: 1.16 kg (2.56 lbs).

Mounting dimensions

Shaft abutment diameter d1: 99 mm minimum. Housing abutment diameter D1: 131 mm maximum. Outer ring abutment D2: 134 mm maximum. Chamfer r: 1.5 mm minimum. Chamfer r1: 1.0 mm minimum. Effective Load Centre a: 27.4 mm. Internal volume: 49.3 cm³, the figure grease quantity is calculated from. Bearing tolerances are to P4: bore deviation −10 µm, radial runout of the assembled inner ring 6 µm.

Quantity and configuration

Unit Quantity: 2 Pcs, a matched duplex pair. Universal face control means the inner and outer rings are the same width and the faces are ground at manufacture to the specified preload, so the pair mounts back-to-back, face-to-face or in tandem at the same preload value without ground spacers. Mounted back-to-back at heavy preload the speed factor is 0.40 of the single-bearing figure.

Interchange guidance

Carton and cross designations: 7018C, 7018-C-T-DUH-P4, 2MM9118WI CR DUH, B7018X2TDUHEP7. Cross-references: SKF 7018 CD/P4ADGC, FAG B7018-C-T-P4S-DUH, NSK 7018CTYNDUHP4. Matching envelope, contact angle and preload class across makers gives a like-for-like substitution; the same 90 x 140 x 24 mm envelope at 25° is a related size with different speed and thrust behaviour.