RHP7011CTDULP4Super Precision Angular Contact Ball Bearing Matched Pair – Straight Bore, 55 mm ID, 90 mm OD, 18 mm Width, Open, 15° Contact Angle, Light Preload, ABEC 7

Product Description

What this part is

RHP 7011CTDULP4 matched pair of single-row super-precision angular contact ball bearings, made in England. Bore: 55 mm. Outside Diameter: 90 mm. Overall Width: 18 mm. Contact Angle: 15°. Precision Class: P4, equivalent to ABEC 7 and to BS292 EP7. Number Of Rows: 1 per bearing. Rolling Elements: Balls. Bearing Material: Carbon chrome bearing steel to BS970 534A99/535A99, equivalent to SAE 52100, through hardened. Series: 7000, ISO dimension series 10. RHP is an NSK brand.

Decoding the designation

Reading 7011-C-T-DUL-P4: 7 is a single-row angular contact ball bearing, 0 is ISO dimension series 10, the bore code 11 gives a 55 mm bore, C is the 15° contact angle, T is the laminated phenolic resin cage, DU marks a paired unit, L is light preload and P4 is the precision grade. The carton carries two further schemes and both agree: the RHP B-series form B7011X2 TA DUL EP7, where X2 is 15°, TA the outer-ring-guided phenolic cage and EP7 the precision grade, and the Fafnir cross 2MM9111WI CR DUL, where 2MM is 15° and CR the phenolic outer-land-riding cage.

What these specs mean in practice

Dynamic Load Rating: 34.0 kN per bearing. Static Load Rating: 28.6 kN per bearing. Limiting Speed, oil-air lubrication: 25,000 rpm. Limiting Speed, grease lubrication: 15,400 rpm. Those figures are for a single bearing under light spring preload. Mounted as a back-to-back light-preload pair the limiting speeds are multiplied by 0.80, giving 20,000 rpm on oil-air and 12,320 rpm on grease. A 15° contact angle favours speed and radial stiffness where a 25° angle favours thrust capacity.

Cage and temperature

Cage Material: Laminated phenolic resin. Cage Type: Outer-ring guided. Maximum Operating Temperature: 120 °C, the limit set by the phenolic cage. The cage is light and damps well, and running it against the outer ring land keeps it stable at speed.

Preload and stiffness

Preload: Light. Axial Preload: 200 N for the mounted pair. Axial Stiffness: 69 N/µm. Light is the grade RHP selects most often, suiting applications where loads and speeds are not extreme. RHP publishes exactly four preload grades: extra light, light, medium and heavy.

Mounting data

Bore Type: Straight. Closure Type: Open. Minimum Shaft Abutment Diameter: 62 mm. Maximum Housing Abutment Diameter: 83 mm. Maximum Outer Ring Abutment Diameter: 85 mm. Chamfer r min: 1.1 mm. Chamfer r1 min: 0.6 mm. Effective Load Centre a: 18.7 mm. Internal Volume: 16.9 cm³. Pitch Circle Diameter Of Lubrication Jets: 67.3 mm. The rings are universally faced, so the pair mounts back-to-back or face-to-face without altering the preload value.

Quantity and configuration

Unit Quantity: 2 Pcs. Arrangement: DU, a universally matched pair. Item Weight: 0.75 kg (1.65 lb) for the pair, 0.375 kg (0.83 lb) each. Bore and outside diameters are matched across the set and the deviation from nominal in microns is marked on each ring face.

Interchange guidance

Cross-references on the same envelope, angle and preload: SKF 7011 CD/P4ADGA and Fafnir 2MM9111WI CR DUL. The designation is also written 7011CTDULP4, 7011 C T DUL P4, 7011C and B7011X2TADULEP7. A 7011 at a 25° contact angle shares this 55 x 90 x 18 mm envelope but carries different ratings and speeds, so it is a related size rather than a substitution.