7308-BE-2RZP bearing: complete specifications & equivalents

Specification table

Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018)) · extracted 2026-09-27

Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018)); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.

Cross references & equivalents

Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.

How the 7308-BE-2RZP model number is decoded

7308 BE-2RZP is SKF's 40 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 40×90×23 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage. Envelope 40×90×23 mm (1.575×3.543×0.906 in), 25.0 mm radial section height, C 46.2 kN, C0 30.5 kN, Pu 1.29 kN.reference speed 9,500 r/min (thermal) and limiting speed 7,500 r/min (mechanical), catalogue mass 620 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 7,500 r/min while thermal balance under catalogue load sets the 9,500 r/min reference; at dm ≈ 65.0 mm the corresponding dn is approximately 488k mm·r/min. Sizing arithmetic on the 40 mm bore: 46.2 kN C divided by the 25.0 mm radial section height gives 1.8 kN per section millimetre; the 620 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 90 over bore 40 is a 2.25× step for this size, and the 23 mm width gives a bore/width ratio of 1.74; use these ratios when housing space around the 40 mm shaft is the first constraint. Sealing note: the two non-contact NBR -2RZ seals run in recessed grooves without touching the inner ring, so drag and speed loss stay small while the standard grease fill is retained and coarse dust is excluded; they are not lip-contact seals, so pressure washing and fine slurry still require external housing seals. The uncapped BECBP/BEP executions are the open counterparts.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Greased positions should fill roughly 25–35 % of the free volume on a 7308-BE-2RZP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.
• At 40 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.
• One 7308-BE-2RZP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.
• Fillet radii must clear the chamfer so the 23 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
• The steep 40° angle of 7308-BE-2RZP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.
• The non-contact -2RZ seals of 7308-BE-2RZP add little drag but are not contact seals; in wet or fine-dust duty retain external sealing at the housing.