RHP7004ETDULP4Super Precision Angular Contact Ball Bearing – Straight Bore, 20 mm ID, 42 mm OD, 12 mm Width, Open, 25° Contact Angle, Light Preload, ABEC 7 / P4, Matched Pair

Product Description

What this part is

RHP 7004ETDULP4 super-precision single-row angular contact ball bearing, supplied as a matched duplex pair. Bore: 20 mm. Outside Diameter: 42 mm. Width: 12 mm. Contact Angle: 25°. Precision Class: P4, equivalent to ABEC 7 and ISO Class 4. Dynamic Load Rating: 10.6 kN. Static Load Rating: 6.25 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

7004 is the type and size: single-row angular contact, ISO dimension series 10, bore code 04 for a 20 mm bore. E sets the contact angle at 25°. T is the outer-ring-guided laminated phenolic resin cage. DU marks a universally ground paired unit. L sets light preload. P4 is the precision grade. Searchable variants of the number: 7004E, 7004-E-T-DUL-P4, 7004 ET DUL P4, B7004X3TADULEP7, 3MM9104WI DUL.

What these specs mean in practice

Limiting Speed: 47,400 r/min on oil-air lubrication and 29,300 r/min on grease. The two figures are the published pair for a single bearing under light external load. A 25° contact angle carries more thrust than the 15° execution in the same envelope and gives up some speed for it: the 15° 7004C runs 53,600 r/min on oil-air against 47,400 here. Preload: Light, 78 N axial. Axial Stiffness: 68 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: 0.069 kg (0.15 lbs) each.

Mounting dimensions

Shaft abutment diameter d1: 25 mm minimum. Housing abutment diameter D1: 37 mm maximum. Outer ring abutment D2: 39.5 mm maximum. Chamfer r: 0.6 mm minimum. Chamfer r1: 0.3 mm minimum. Effective Load Centre a: 13.2 mm. Internal volume: 3.1 cm³, the figure grease quantity is calculated from. Bearing tolerances are to P4: bore deviation −5 µm, radial runout of the assembled inner ring 4 µm.

Quantity and configuration

Unit Quantity: 2 Pcs, a matched duplex pair at light preload. 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 light preload the speed factor is 0.80 of the single-bearing figure. 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.

Interchange guidance

Cross-references: SKF 7004 ACD/P4ADGA, FAG B7004-E-T-P4S-DUL, NSK 7004A5TRDULP4. Each names the 25° execution in its own maker’s scheme, so all three are like-for-like on angle, envelope and precision. The 15° 7004C shares the same 20 x 42 x 12 mm envelope and is a related size rather than a substitution, since angle sets both the thrust capacity and the speed limit.