RHP7003X3TADUEP7Super Precision Angular Contact Ball Bearing – Straight Bore, 17 mm ID, 35 mm OD, 10 mm Width, Open, 25° Contact Angle, ABEC 7 / EP7, Universally Ground Pair

Product Description

What this part is

RHP 7003X3TADUEP7 super-precision single-row angular contact ball bearing, supplied as a universally ground pair. Bore: 17 mm. Outside Diameter: 35 mm. Width: 10 mm. Contact Angle: 25°. Precision Class: EP7, equivalent to ABEC 7 and ISO Class 4. Dynamic Load Rating: 6.3 kN. Static Load Rating: 3.65 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. Bearing Material: Through-hardened carbon chrome bearing steel to SAE52100.

Decoding the designation

7003 is the type and size: single-row angular contact, ISO dimension series 10, bore code 03 for a 17 mm bore. X3 sets the contact angle at 25° in the RHP B-series scheme. DU marks a universally ground paired unit. EP7 is the British Standard precision grade, the same level as ABEC 7 and ISO Class 4. Searchable variants of the number: 7003X3, 7003 X3 TA DU EP7, 7003X3TADUEP7, B7003X3TADUEP7.

What these specs mean in practice

Limiting Speed: 53,600 r/min on oil-air lubrication and 33,700 r/min on grease. The two figures are the published pair for a single bearing under light external load, and the gap between them is why the lubrication method is chosen before the bearing is. A 25° contact angle carries more thrust than the 15° execution in the same envelope and gives up some speed for it: the 15° 7003C runs 64,100 r/min on oil-air against 53,600 here. Lubricant: grease or oil. Maximum operating temperature for a laminated phenolic resin cage is 120 °C.

Mounting dimensions

Shaft abutment diameter d1: 19.5 mm minimum. Housing abutment diameter D1: 32.5 mm maximum. Outer ring abutment D2: 33.8 mm maximum. Chamfer r: 0.3 mm minimum. Chamfer r1: 0.15 mm minimum. Effective Load Centre a: 11.1 mm. Internal volume: 1.9 cm³, the figure grease quantity is calculated from. Bearing tolerances at this grade: bore deviation −4 µm, radial runout of the assembled inner ring 2.5 µm.

Quantity and configuration

Unit Quantity: 2 Pcs, a universally ground pair. Universal face control means the inner and outer rings are the same width and the relative positions of the faces are adjusted at manufacture, so the pair mounts back-to-back, face-to-face or in tandem without ground spacers, sharing load equally in tandem. The high point of radial runout is marked with a burnished spot on the inner ring face and a V line on the outer ring diameter, and the V line also indicates the direction of the contact angle.

Interchange guidance

Cross-references: NSK 7003A5TRDULP4, FAG B7003-E-T-P4S-UL. Both name the 25° phenolic-caged super-precision execution in their own maker’s scheme, matching angle, cage, envelope and precision; the FAG number is a universal single, so two make the pair. The 15° 7003C shares the same 17 x 35 x 10 mm envelope and is a related size, not a substitute, since angle sets both the thrust capacity and the speed limit.