230-1000B bearing: complete specifications & equivalents
The 230-1000B is a ISO 15 radial bearing sized 1000 x 1420 x 308 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 1000 mm |
| Outer diameter D | 1420 mm |
| Width B | 308 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 13800 kN |
| Basic static load rating C0 | 30000 kN |
| Fatigue load limit Pu | 1460 kN |
| Limiting speed (mechanical) | 170 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1580000 g |
| Manufacturer designation | NTN 230/1000B |
| 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 | 39.37 in |
|---|---|
| Outer diameter D | 55.906 in |
| Width B | 12.126 in |
| ISO bore code | 30 |
| Radial section height (D−d)/2 | 210 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) | 44 of 46 |
| Bore above smallest 23000-series size | 930 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 230-1000BK | 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 230-1000BK (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 230-1000B model number is decoded
230/1000B belongs to the 23000 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 230/1000B to its envelope and execution: same-number EA versus EM or plain variants share the 1000 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Pu 1460 kN is the catalogue fatigue load limit for 230/1000B, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Equivalent-load planning keeps a radial plus moderate axial combination on 230/1000B; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 308 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.
Typical equipment & failure modes
Common applications
- mining shovel and dragline swing shafts
- cement-rotary-kiln support and trunnion rolls
- large SAG/ball-mill trunnion and pinion shafts
- heavy vibrating screens and grizzly feeders
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
- fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient
- false brinelling on stopped machines exposed to screen or crusher vibration
Selection pitfalls — read before you substitute
- At 1000 mm bore 230/1000B 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: 230/1000B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 1000×1420 mm envelope is identical.
- The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 230/1000B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.
- Adapter-sleeve mounting requires the correct sleeve series and locknut for the 1000 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.
- The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 230/1000B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.
- The 13800/30000 kN ratings, 1460 kN Pu and 1580000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/1000B (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 230/1000B?
230/1000B is an NTN double-row spherical roller bearing to ISO 15: 1000 mm bore, 1420 mm OD and 308 mm width (39.37 × 55.906 × 12.126 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 13800 kN, C0 30000 kN, Pu 1460 kN, grease limiting speed 170 r/min, oil 220 r/min, mass about 1580000 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?
230/1000B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 230/1000BK (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. 230/1000B is the basic execution.
What do D1 and W33 mean on 230/1000B?
230/1000B 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 230/1000B 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 — 13800 kN C / 30000 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.