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Deep Groove Ball Bearings: The Industry Default and When to Reach for Something Else
If you pulled a bearing off general industrial equipment at random, there’s a good chance
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1 in stock
Matched duplex pair of 25° angular contact ball bearings, 50 mm bore x 110 mm OD x 27 mm wide each (54 mm stacked), phenolic cage, universally ground for light preload — a medium-series pair for shafts carrying heavy combined radial and thrust load. Sold as the pair, 2 pieces.
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| MFR / Brand | RHP |
|---|---|
| MPN | 7310ETDUL |
| Model | 7310 E T DUL P0/ B 7310 X3 T UL EP1 |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 50 mm |
| OD | 110 mm |
| Width | 27 mm |
| Material | Bearing Steel |
|---|---|
| Series | 7300 |
| Base Number | 7310 |
| Industry Terms | Angular contact pair, matched set bearing, duplex bearing, thrust and radial bearing |
| Common Misspellings | RPH, R.H.P., 7310 ET DUL, 7310-ETDUL, 7310ETDUI |
| Application Types | Pump and compressor shafts, gearbox input shafts, vertical spindles, worm drives |
| Bore Shaft Size | 50 mm |
| Mpn Variants | 7310ETDUL, 7310-E-T-DUL, 7310-E-T-DUL-P0, 7310 E T DUL, 7310ETDULP0 |
| Rolling Elements | Ball |
| Number Of Rows | 1 per bearing (duplex pair) |
| Bore Type | Straight |
| Snap Ring Included | No |
| Harmonization Code | 8482.10.50.68 |
| Part Number | 7310ETDUL |
A matched duplex pair of RHP 7310 angular contact ball bearings, 25° contact angle, phenolic cage, universally ground for light preload. Each bearing is 50 mm bore x 110 mm OD x 27 mm wide, giving 54 mm total when the pair is mounted together. The 7300 medium series has a heavier cross-section than the 7200 light series at the same bore, so this pair suits shafts that carry real radial load as well as thrust — pump and compressor shafts, gearbox input shafts, vertical spindles and worm drives.
7310 is the ISO angular contact envelope, medium series, 50 x 110 x 27 mm. E is the 25° contact angle in the RHP scheme. T is a phenolic cage. DUL is duplex, universally ground, light preload. P0 is normal (standard) tolerance class.
The 25° contact angle is the general-purpose choice: markedly more thrust capacity and axial stiffness than a 15° bearing, without the speed penalty of a 30° or 40° design. Universally ground rings with light preload mean the two bearings are ground to stack with a controlled, gentle internal load — the shaft is held axially in both directions with minimal free play but without the heat of a heavy preload. P0 is normal tolerance class, so this is a precision-arranged pair rather than a super-precision spindle set; it is intended for load capacity and axial location, not for sub-micron runout work.
Bore: 50 mm. Outside diameter: 110 mm. Width: 27 mm each bearing. Total width mounted as a pair: 54 mm. Contact angle: 25°. Tolerance class: P0 (normal). Preload: light. Cage: phenolic. Series: 7300, medium. Rows: single row each, mounted as a duplex pair. Closure: open. Dynamic load rating: 74.1 kN. Static load rating: 53 kN. Limiting speed: 5800 rpm. Mass: 2.20 lbs.
Two bearings, supplied as the matched set. Universally ground rings allow back-to-back (DB), face-to-face (DF) or tandem (DT) mounting and still produce the intended light preload without a spacer. A DB or DF arrangement takes thrust in both directions; tandem takes heavy thrust in one direction only.
Direct equivalents are 7310-envelope 25° light-preload universally ground duplex pairs, including NSK 7310 B/A5 DU forms in the same angle and RHP’s own 7310-E-T-DUL. Related but NOT interchangeable: 7310C at 15°, 7310B at 40°, and DUM / DUH medium and heavy preload variants. Angle and preload must both match the original.
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