230-710B bearing: complete specifications & equivalents
The 230-710B is a ISO 15 radial bearing sized 710 x 1030 x 236 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 | 1030 mm |
| Width B | 236 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 8000 kN |
| Basic static load rating C0 | 16200 kN |
| Fatigue load limit Pu | 1140 kN |
| Limiting speed (mechanical) | 260 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 663000 g |
| Manufacturer designation | NTN 230/710B |
| 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 & 23000-series range
| Bore d | 27.953 in |
|---|---|
| Outer diameter D | 40.551 in |
| Width B | 9.291 in |
| ISO bore code | 30 |
| Radial section height (D−d)/2 | 160 mm |
| Smallest bore in 23000-series | 70 mm |
| Largest outer diameter in 23000-series | 1580 mm |
| Width range across 23000-series | 27–345 mm |
| Bore position in 23000-series (smallest first) | 38 of 46 |
| Bore above smallest 23000-series size | 640 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 230-710BK | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 230-710BK (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 230-710B model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, 230/710B denotes the 710 mm bore spherical roller bearing (8000 kN C / 16200 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 710×1030 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. Speed planning: 260 r/min grease limiting speed is the cage/kinematic ceiling and 340 r/min is the oil-lubricated value for the 710 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 230/710B leaves sealing and the C3/C4 clearance decision to the application drawing.
Typical equipment & failure modes
Common applications
- steel-mill and heavy crusher main shafts
- mining shovel and dragline swing shafts
- cement-rotary-kiln support and trunnion rolls
- large SAG/ball-mill trunnion and pinion shafts
Known failure patterns
- lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply
- pressed EA cage fatigue under sustained vibration when minimum load is not maintained
- roller-end smearing during skidding starts under light load and high viscosity grease
- rolling-contact fatigue after the catalogue L10 life at the actual load
- brinelling from static overload or a hammer blow during sleeve mounting
Selection pitfalls — read before you substitute
- At 710 mm bore 230/710B 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.
- Oil relubrication toward 340 r/min needs drain and level design; flooding the 236 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.
- Oil relubrication toward 340 r/min needs drain and level design; flooding the 236 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.
- Oil relubrication toward 340 r/min needs drain and level design; flooding the 236 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.
- Never substitute 230/710B by envelope alone: the 16200 kN C0 and 1140 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.
- The 8000/16200 kN ratings, 1140 kN Pu and 663000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/710B (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 230/710B?
230/710B is an NTN double-row spherical roller bearing to ISO 15: 710 mm bore, 1030 mm OD and 236 mm width (27.953 × 40.551 × 9.291 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 8000 kN, C0 16200 kN, Pu 1140 kN, grease limiting speed 260 r/min, oil 340 r/min, mass about 663000 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?
230/710B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 230/710BK (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. 230/710B is the basic execution.
What do D1 and W33 mean on 230/710B?
230/710B 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 230/710B take?
The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 8000 kN C / 16200 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.