240-530B bearing: complete specifications & equivalents
The 240-530B is a ISO 15 radial bearing sized 530 x 780 x 250 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 530 mm |
| Outer diameter D | 780 mm |
| Width B | 250 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 6200 kN |
| Basic static load rating C0 | 12700 kN |
| Fatigue load limit Pu | 700 kN |
| Limiting speed (mechanical) | 330 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 413000 g |
| Manufacturer designation | NTN 240/530B |
| 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 | 20.866 in |
|---|---|
| Outer diameter D | 30.709 in |
| Width B | 9.843 in |
| ISO bore code | 40 |
| Radial section height (D−d)/2 | 125 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) | 29 of 42 |
| Bore above smallest 24000-series size | 465 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 240-530BK30 | 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 240-530BK30 (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 240-530B model number is decoded
240/530B is the basic execution of NTN's spherical roller range for a 530 mm shaft — 6200 kN basic dynamic capacity in a 413000 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (24000 series); the bore code resolves to 530 mm (two-digit code ×5, with the 00–03 exception table), and 780 mm OD / 250 mm width follow the general plan. At 6200 kN C and 413000 g mass the 24000 series part is built for shock and vibration; the 250 mm-wide ring needs square abutments to keep both rows equally loaded. 530 mm bore is 20.866 in and 780 mm OD is 30.709 in; the ISO 15 envelope swaps between brands, but the 6200/12700 kN ratings and cage design are NTN 2203E values. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 240/530B leaves sealing and the C3/C4 clearance decision to the application drawing.
Typical equipment & failure modes
Common applications
- offshore and marine propulsion shaftlines
- large wind-turbine main-shaft arrangements
- steel-mill and heavy crusher main shafts
- mining shovel and dragline swing shafts
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
- brinelling from static overload or a hammer blow during sleeve mounting
- brinelling from static overload or a hammer blow during sleeve mounting
Selection pitfalls — read before you substitute
- At 530 mm bore 240/530B 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: 240/530B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 530×780 mm envelope is identical.
- Do not confuse EA and EM at the same number: 240/530B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 530×780 mm envelope is identical.
- Minimum load must be maintained even at rest under vibration: an unloaded 240/530B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.
- Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 330 r/min grease rating is lost to abrasive wear long before fatigue.
- The 6200/12700 kN ratings, 700 kN Pu and 413000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/530B (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 240/530B?
240/530B is an NTN double-row spherical roller bearing to ISO 15: 530 mm bore, 780 mm OD and 250 mm width (20.866 × 30.709 × 9.843 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6200 kN, C0 12700 kN, Pu 700 kN, grease limiting speed 330 r/min, oil 430 r/min, mass about 413000 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?
240/530B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 240/530BK30 (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. 240/530B is the basic execution.
What do D1 and W33 mean on 240/530B?
240/530B 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 240/530B 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 — 6200 kN C / 12700 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.