239-710 bearing: complete specifications & equivalents
The 239-710 is a ISO 15 radial bearing sized 710 x 950 x 180 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 710 mm |
| Outer diameter D | 950 mm |
| Width B | 180 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 4950 kN |
| Basic static load rating C0 | 11500 kN |
| Fatigue load limit Pu | 665 kN |
| Limiting speed (mechanical) | 280 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 375000 g |
| Manufacturer designation | NTN 239/710 |
| Standard | ISO 15 |
| Catalog version | NTN Ball and Roller Bearings CAT.No.2203E |
| Last verified | 2026-10-01 |
Source: catalog reference (NTN Ball and Roller Bearings CAT.No.2203E) · extracted 2026-10-01
Parameters extracted from the official NTN Ball and Roller Bearings catalogue (NTN Ball and Roller Bearings CAT.No.2203E); NTN® is a trademark of NTN Corporation, used here for identification only — mpnbase is not an authorized NTN distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at ntnglobal.com.
Dimensions in inches & 23900-series range
| Bore d | 27.953 in |
|---|---|
| Outer diameter D | 37.402 in |
| Width B | 7.087 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 120 mm |
| Smallest bore in 23900-series | 160 mm |
| Largest outer diameter in 23900-series | 1820 mm |
| Width range across 23900-series | 45–315 mm |
| Bore position in 23900-series (smallest first) | 26 of 38 |
| Bore above smallest 23900-series size | 550 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 239-710K | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 239-710K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement. |
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 239-710 model number is decoded
239/710 is the basic execution of NTN's spherical roller range for a 710 mm shaft — 4950 kN basic dynamic capacity in a 375000 g, open ISO 15 envelope. Numbering ties 239/710 to its envelope and execution: same-number EA versus EM or plain variants share the 710 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Pu 665 kN is the catalogue fatigue load limit for 239/710, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. 710 mm bore is 27.953 in and 950 mm OD is 37.402 in; the ISO 15 envelope swaps between brands, but the 4950/11500 kN ratings and cage design are NTN 2203E values. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 710 mm bore assembly by hand to distribute it across both rows.
Typical equipment & failure modes
Common applications
- heavy vibrating screens and grizzly feeders
- offshore and marine propulsion shaftlines
- large wind-turbine main-shaft arrangements
- steel-mill and heavy crusher main shafts
Known failure patterns
- lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply
- cage damage when a mounting force is applied through the roller set instead of the ring face
- roller-end smearing during skidding starts under light load and high viscosity grease
- asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range
- brinelling from static overload or a hammer blow during sleeve mounting
Selection pitfalls — read before you substitute
- At 710 mm bore 239/710 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.
- Do not confuse EA and EM at the same number: 239/710 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 710×950 mm envelope is identical.
- Minimum load must be maintained even at rest under vibration: an unloaded 239/710 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.
- Oil relubrication toward 370 r/min needs drain and level design; flooding the 180 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.
- The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 239/710 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.
- The 4950/11500 kN ratings, 665 kN Pu and 375000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/710 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives.
Frequently asked questions
What are the dimensions and catalogue data of 239/710?
239/710 is an NTN double-row spherical roller bearing to ISO 15: 710 mm bore, 950 mm OD and 180 mm width (27.953 × 37.402 × 7.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4950 kN, C0 11500 kN, Pu 665 kN, grease limiting speed 280 r/min, oil 370 r/min, mass about 375000 g. It is open, with pressed-steel cage (standard execution).
What is the difference between the K/K30 tapered bore and the cylindrical bore versions?
239/710 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/710K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting.
What do EA and EM mean on NTN spherical roller bearings?
EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/710 is the basic execution.
What do D1 and W33 mean on 239/710?
239/710 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope.
How much misalignment and axial load can 239/710 take?
The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4950 kN C / 11500 kN C0 — but sustained pure axial load is not recommended because it unloads one row.
Reviewed & verified by the MPN Base engineering desk against source catalog NTN Ball and Roller Bearings CAT.No.2203E on 2026-10-01. Read our editorial & correction policy.