239-1180K bearing: complete specifications & equivalents
The 239-1180K 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 | 1340000 g |
| Manufacturer designation | NTN 239/1180K |
| 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 | 39 |
| 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 |
|---|---|---|---|
| 239-1180 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 239-1180 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. 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 239-1180K model number is decoded
For heavy radial load with misalignment on a 1180 mm shaft, NTN supplies 239/1180K: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 180 r/min. Reading the full code: the number gives the 1180×1540 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. Pu 1650 kN is the catalogue fatigue load limit for 239/1180K, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 10.3 kN of C per millimetre of the 1180 mm bore, 239/1180K screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. 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
- 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 1180 mm bore 239/1180K 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: 239/1180K carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 1180×1540 mm envelope is identical.
- Oil relubrication toward 180 r/min needs drain and level design; flooding the 272 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.
- Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 140 r/min grease rating is lost to abrasive wear long before fatigue.
- The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 239/1180K 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 1340000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/1180K (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 239/1180K?
239/1180K 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 1340000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore.
What is the difference between the K/K30 tapered bore and the cylindrical bore versions?
K denotes a 1:12 tapered bore. 239/1180K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 239/1180.
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. 239/1180K is the basic execution.
What do D1 and W33 mean on 239/1180K?
239/1180K 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 239/1180K 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.