239-530 bearing: complete specifications & equivalents
The 239-530 is a ISO 15 radial bearing sized 530 x 710 x 136 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 | 710 mm |
| Width B | 136 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 2940 kN |
| Basic static load rating C0 | 6450 kN |
| Fatigue load limit Pu | 400 kN |
| Limiting speed (mechanical) | 400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 157000 g |
| Manufacturer designation | NTN 239/530 |
| 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 | 20.866 in |
|---|---|
| Outer diameter D | 27.953 in |
| Width B | 5.354 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 90 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) | 21 of 38 |
| Bore above smallest 23900-series size | 370 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 239-530K | 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 239-530K (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 239-530 model number is decoded
239/530 is the basic execution of NTN's spherical roller range for a 530 mm shaft — 2940 kN basic dynamic capacity in a 157000 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); 239/530 is assembled exactly in that order. The cylindrical bore fits a machined 530 mm shaft seat directly; the same envelope in 239/530K (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Pu 400 kN against C0 6450 kN anchors the contamination derating; for dirty mining duty the adjusted life of 239/530 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 136 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.
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
- 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
- sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path
- false brinelling on stopped machines exposed to screen or crusher vibration
- water-induced pitting in washdown or outdoor duty without effective external seals
Selection pitfalls — read before you substitute
- At 530 mm bore 239/530 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.
- 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 530 mm bearing, and drive-up procedures differ.
- The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 239/530 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.
- Never substitute 239/530 by envelope alone: the 6450 kN C0 and 400 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.
- Do not confuse EA and EM at the same number: 239/530 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 530×710 mm envelope is identical.
- The 2940/6450 kN ratings, 400 kN Pu and 157000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/530 (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 239/530?
239/530 is an NTN double-row spherical roller bearing to ISO 15: 530 mm bore, 710 mm OD and 136 mm width (20.866 × 27.953 × 5.354 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2940 kN, C0 6450 kN, Pu 400 kN, grease limiting speed 400 r/min, oil 520 r/min, mass about 157000 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?
239/530 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/530K (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. 239/530 is the basic execution.
What do D1 and W33 mean on 239/530?
239/530 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 239/530 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 — 2940 kN C / 6450 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.