RHP7008ETDULP4Angular Contact Ball Bearing — 40 mm ID, 68 mm OD, 15 mm Width, Open, 25° Contact Angle, Light Preload, Phenolic Outer-Ring-Guided Cage, P4 Class

Product Description

What this part is

RHP 7008ETDULP4 super-precision angular contact ball bearings, supplied as a matched universal duplex set. Bore: 40 mm. Outside Diameter: 68 mm. Overall Width: 15 mm per bearing. Total Width: 30 mm assembled. Closure Type: Open. Contact Angle: 25°. Preload: Light (L). Cage Type: Machined, outer ring guided. Cage Material: Laminated phenolic resin. Precision Class: P4 (ISO Class 4); RHP class code EP7; ABEC 7. Bearing Material: Carbon chrome bearing steel, BS970 534A99/535A99 or SAE 52100. Rolling Elements: Ball. Number Of Rows: 1 per bearing. Series: ISO series 10 (70xx).

Decoding the designation

7 — single-row angular contact ball bearing.

0 — ISO dimension series 10.

08 — bore code 08, a 40 mm bore.

E — 25° contact angle in the legacy RHP scheme, written A5 in current NSK notation and confirmed by the X3 in the carton designation B7008X3TADUEP7.

T — laminated phenolic resin cage; the TA in the B-series designation gives outer ring centring.

DU — universally faced duplex set.

L — light preload.

P4 — ISO Class 4, RHP class code EP7, ABEC 7.

Load ratings, speed and preload

Dynamic Load Rating: 19.5 kN (19,500 N) per bearing. Static Load Rating: 15.1 kN (15,100 N) per bearing. Limiting Speed: 23,760 r/min oil/air and 14,720 r/min grease for a back-to-back light-preload pair. Axial preload: 200 N. Axial stiffness: 127 N/µm. Running Accuracy: inner ring radial runout Kia 4 µm maximum, outer ring radial runout Kea 5 µm maximum, to P4.

What these specs mean in practice

A 25° contact angle carries more thrust and gives greater axial stiffness than a 15° bearing of the same size, at the cost of a lower speed ceiling. Light preload removes internal play while keeping friction and heat generation modest, so the set holds shaft position under load. The machined phenolic cage is light and self-lubricating, and outer ring centring keeps it stable at high cage speeds.

Quantity and configuration

Unit Quantity: 2 Pcs, a matched universal duplex set. Each bearing is single row and open.

Mounting data

Universal face control allows assembly back-to-back, face-to-face or in tandem, and the built-in light preload develops as the rings are clamped. Back-to-back and face-to-face arrangements locate the shaft axially in both directions; tandem shares thrust in one direction. Shaft abutment diameter d1: 46 mm minimum. Housing abutment diameter D1: 62 mm maximum. Outer ring abutment D2: 63 mm maximum. Chamfer r: 1.0 mm minimum. Chamfer r1: 0.6 mm minimum. Effective load centre a: 20.1 mm. Internal free volume: 8.2 cm3 per bearing. PCD of lubrication jets: 50.0 mm. Item weight: 0.189 kg (0.417 lb) per bearing.

Interchange guidance

NSK 7008A5TRDULP4 is the direct equivalent: same envelope, 25° angle, phenolic outer-ring-guided cage, light-preload universal duplex, Class 4. SKF 7008 ACD/P4ADGA matches on envelope, 25° angle, light preload and precision class. The Fafnir carton cross 3MM9108WI CR DUL reads the same way: 3MM gives 25°, 9108 maps to ISO 7008, CR is the phenolic cage and DUL the light-preload duplex. A 7008 at a 15° angle, a different preload letter or a lower precision class shares the 40 x 68 x 15 mm envelope but is a related size.