239-1180 bearing: complete specifications & equivalents
The 239-1180 is a ISO 15 radial bearing sized 1180 x 1540 x 272 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 1180 mm |
| Outer diameter D | 1540 mm |
| Width B | 272 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 12200 kN |
| Basic static load rating C0 | 29800 kN |
| Fatigue load limit Pu | 1650 kN |
| Limiting speed (mechanical) | 140 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1390000 g |
| Manufacturer designation | NTN 239/1180 |
| 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 | 46.457 in |
|---|---|
| Outer diameter D | 60.63 in |
| Width B | 10.709 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 180 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) | 35 of 38 |
| Bore above smallest 23900-series size | 1020 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 239-1180K | 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 239-1180K (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 239-1180 model number is decoded
239/1180 belongs to the 23900 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 1180 mm (two-digit code ×5, with the 00–03 exception table), and 1540 mm OD / 272 mm width follow the general plan. Pu 1650 kN is the catalogue fatigue load limit for 239/1180, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. The 180.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 272 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.
Typical equipment & failure modes
Common applications
- cement-rotary-kiln support and trunnion rolls
- large SAG/ball-mill trunnion and pinion shafts
- heavy vibrating screens and grizzly feeders
- offshore and marine propulsion shaftlines
Known failure patterns
- raceway spalling at the roller ends when misalignment or deflection concentrates the line contact
- cage damage when a mounting force is applied through the roller set instead of the ring face
- micro-pitting when the EHL film is thinner than the raceway composite roughness
- hard-particle indentation through the open arrangement in dusty mining duty
- fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient
Selection pitfalls — read before you substitute
- At 1180 mm bore 239/1180 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 cylindrical-bore 239/1180 and its tapered-bore counterpart 239/1180K share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.
- Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 12200 kN rating no longer applies.
- The two roller rows must share load equally — a tilted spacer or unequal abutment on the 272 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.
- The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 239/1180 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.
- The 12200/29800 kN ratings, 1650 kN Pu and 1390000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/1180 (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 239/1180?
239/1180 is an NTN double-row spherical roller bearing to ISO 15: 1180 mm bore, 1540 mm OD and 272 mm width (46.457 × 60.63 × 10.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 12200 kN, C0 29800 kN, Pu 1650 kN, grease limiting speed 140 r/min, oil 180 r/min, mass about 1390000 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?
239/1180 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/1180K (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. 239/1180 is the basic execution.
What do D1 and W33 mean on 239/1180?
239/1180 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 239/1180 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 — 12200 kN C / 29800 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.