232-530BK bearing: complete specifications & equivalents
The 232-530BK is a ISO 15 radial bearing sized 530 x 980 x 355 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 | 980 mm |
| Width B | 355 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 11500 kN |
| Basic static load rating C0 | 19800 kN |
| Fatigue load limit Pu | 1210 kN |
| Limiting speed (mechanical) | 280 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1170000 g |
| Manufacturer designation | NTN 232/530BK |
| 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 & 23200-series range
| Bore d | 20.866 in |
|---|---|
| Outer diameter D | 38.583 in |
| Width B | 13.976 in |
| ISO bore code | 32 |
| Radial section height (D−d)/2 | 225 mm |
| Smallest bore in 23200-series | 90 mm |
| Largest outer diameter in 23200-series | 1360 mm |
| Width range across 23200-series | 52.4–475 mm |
| Bore position in 23200-series (smallest first) | 28 of 34 |
| Bore above smallest 23200-series size | 440 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 232-530B | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 232-530B — 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 232-530BK model number is decoded
232/530BK is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 530×980×355 mm to ISO 15, with pressed-steel cage (standard execution). Numbering ties 232/530BK to its envelope and execution: same-number EA versus EM or plain variants share the 530 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 232/530BK: the bare number is the standard open execution; K marks the 1:12 tapered bore; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. With about 21.7 kN of C per millimetre of the 530 mm bore, 232/530BK screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Mount 232/530BK on its adapter or withdrawal sleeve on the 530 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.
Typical equipment & failure modes
Common applications
- steel-mill and heavy crusher main shafts
- mining shovel and dragline swing shafts
- cement-rotary-kiln support and trunnion rolls
- large SAG/ball-mill trunnion and pinion shafts
Known failure patterns
- lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply
- machined EM cage wear from inadequate oil film at the cage-guiding surfaces
- sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path
- asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range
- fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient
Selection pitfalls — read before you substitute
- At 530 mm bore 232/530BK 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 1:12 tapered bore is the only difference from the cylindrical-bore 232/530B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.
- The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 232/530BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.
- Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 280 r/min grease rating is lost to abrasive wear long before fatigue.
- The two roller rows must share load equally — a tilted spacer or unequal abutment on the 355 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.
- The 11500/19800 kN ratings, 1210 kN Pu and 1170000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/530BK (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 232/530BK?
232/530BK is an NTN double-row spherical roller bearing to ISO 15: 530 mm bore, 980 mm OD and 355 mm width (20.866 × 38.583 × 13.976 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 11500 kN, C0 19800 kN, Pu 1210 kN, grease limiting speed 280 r/min, oil 370 r/min, mass about 1170000 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. 232/530BK 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 232/530B.
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. 232/530BK is the basic execution.
What do D1 and W33 mean on 232/530BK?
232/530BK 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 232/530BK take?
The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 11500 kN C / 19800 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.