239-1000 bearing: complete specifications & equivalents
The 239-1000 is a ISO 15 radial bearing sized 1000 x 1320 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 | 1000 mm |
| Outer diameter D | 1320 mm |
| Width B | 236 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 9550 kN |
| Basic static load rating C0 | 22700 kN |
| Fatigue load limit Pu | 1520 kN |
| Limiting speed (mechanical) | 180 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 916000 g |
| Manufacturer designation | NTN 239/1000 |
| 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 | 39.37 in |
|---|---|
| Outer diameter D | 51.969 in |
| Width B | 9.291 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 160 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) | 32 of 38 |
| Bore above smallest 23900-series size | 840 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 239-1000K | 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 239-1000K (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 239-1000 model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, 239/1000 denotes the 1000 mm bore spherical roller bearing (9550 kN C / 22700 kN C0) in the 23900 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 1000 mm (two-digit code ×5, with the 00–03 exception table), and 1320 mm OD / 236 mm width follow the general plan. Suffix reading on 239/1000: the bare number is the standard open execution; quote the full code because each suffix is a distinct article. Grease/oil ratio: the 180 r/min limiting value is .78 of the 230 r/min oil value; heavy 236 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Never mount 239/1000 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 1320 mm race.
Typical equipment & failure modes
Common applications
- large SAG/ball-mill trunnion and pinion shafts
- heavy vibrating screens and grizzly feeders
- offshore and marine propulsion shaftlines
- large wind-turbine main-shaft arrangements
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
- fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient
Selection pitfalls — read before you substitute
- At 1000 mm bore 239/1000 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.
- The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 239/1000 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.
- Never substitute 239/1000 by envelope alone: the 22700 kN C0 and 1520 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.
- K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 1000 mm bearing, and drive-up procedures differ.
- The two roller rows must share load equally — a tilted spacer or unequal abutment on the 236 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.
- The 9550/22700 kN ratings, 1520 kN Pu and 916000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/1000 (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 239/1000?
239/1000 is an NTN double-row spherical roller bearing to ISO 15: 1000 mm bore, 1320 mm OD and 236 mm width (39.37 × 51.969 × 9.291 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 9550 kN, C0 22700 kN, Pu 1520 kN, grease limiting speed 180 r/min, oil 230 r/min, mass about 916000 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?
239/1000 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/1000K (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. 239/1000 is the basic execution.
What do D1 and W33 mean on 239/1000?
239/1000 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 239/1000 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 — 9550 kN C / 22700 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.