240-1120B bearing: complete specifications & equivalents
The 240-1120B is a ISO 15 radial bearing sized 1120 x 1580 x 462 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 1120 mm |
| Outer diameter D | 1580 mm |
| Width B | 462 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 21700 kN |
| Basic static load rating C0 | 52500 kN |
| Fatigue load limit Pu | 2230 kN |
| Limiting speed (mechanical) | 120 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2890000 g |
| Manufacturer designation | NTN 240/1120B |
| 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 & 24000-series range
| Bore d | 44.094 in |
|---|---|
| Outer diameter D | 62.205 in |
| Width B | 18.189 in |
| ISO bore code | 40 |
| Radial section height (D−d)/2 | 230 mm |
| Smallest bore in 24000-series | 65 mm |
| Largest outer diameter in 24000-series | 1580 mm |
| Width range across 24000-series | 35–462 mm |
| Bore position in 24000-series (smallest first) | 42 of 42 |
| Bore above smallest 24000-series size | 1055 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 240-1120BK30 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 240-1120BK30 (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 240-1120B model number is decoded
240/1120B is the basic execution of NTN's spherical roller range for a 1120 mm shaft — 21700 kN basic dynamic capacity in a 2890000 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 240/1120B is assembled exactly in that order. The 230.0 mm radial section over the 1120 mm bore carries two roller rows; capacity per millimetre of bore is about 19.4 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. 1120 mm bore is 44.094 in and 1580 mm OD is 62.205 in; the ISO 15 envelope swaps between brands, but the 21700/52500 kN ratings and cage design are NTN 2203E values. Fit the cylindrical-bore 240/1120B with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.
Typical equipment & failure modes
Common applications
- heavy vibrating screens and grizzly feeders
- offshore and marine propulsion shaftlines
- large wind-turbine main-shaft arrangements
- steel-mill and heavy crusher main shafts
Known failure patterns
- raceway spalling at the roller ends when misalignment or deflection concentrates the line contact
- pressed EA cage fatigue under sustained vibration when minimum load is not maintained
- micro-pitting when the EHL film is thinner than the raceway composite roughness
- rolling-contact fatigue after the catalogue L10 life at the actual load
- fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient
Selection pitfalls — read before you substitute
- At 1120 mm bore 240/1120B 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: 240/1120B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 1120×1580 mm envelope is identical.
- The cylindrical-bore 240/1120B and its tapered-bore counterpart 240/1120BK30 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.
- Adapter-sleeve mounting requires the correct sleeve series and locknut for the 1120 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.
- The cylindrical-bore 240/1120B and its tapered-bore counterpart 240/1120BK30 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.
- The 21700/52500 kN ratings, 2230 kN Pu and 2890000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/1120B (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 240/1120B?
240/1120B is an NTN double-row spherical roller bearing to ISO 15: 1120 mm bore, 1580 mm OD and 462 mm width (44.094 × 62.205 × 18.189 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 21700 kN, C0 52500 kN, Pu 2230 kN, grease limiting speed 120 r/min, oil 160 r/min, mass about 2890000 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?
240/1120B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 240/1120BK30 (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. 240/1120B is the basic execution.
What do D1 and W33 mean on 240/1120B?
240/1120B 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 240/1120B take?
The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 21700 kN C / 52500 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.