232-500B bearing: complete specifications & equivalents
The 232-500B is a ISO 15 radial bearing sized 500 x 920 x 336 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 500 mm |
| Outer diameter D | 920 mm |
| Width B | 336 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 10500 kN |
| Basic static load rating C0 | 17800 kN |
| Fatigue load limit Pu | 1100 kN |
| Limiting speed (mechanical) | 310 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1000000 g |
| Manufacturer designation | NTN 232/500B |
| 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 | 19.685 in |
|---|---|
| Outer diameter D | 36.22 in |
| Width B | 13.228 in |
| ISO bore code | 32 |
| Radial section height (D−d)/2 | 210 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) | 27 of 34 |
| Bore above smallest 23200-series size | 410 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 232-500BK | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 232-500BK (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 232-500B model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, 232/500B denotes the 500 mm bore spherical roller bearing (10500 kN C / 17800 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 232/500B is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Catalogue mass 1000000 g (1000.00 kg) for the 500×920×336 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 500 mm bore assembly by hand to distribute it across both rows.
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
- roller-end smearing during skidding starts under light load and high viscosity grease
- brinelling from static overload or a hammer blow during sleeve mounting
- hard-particle indentation through the open arrangement in dusty mining duty
Selection pitfalls — read before you substitute
- At 500 mm bore 232/500B 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.
- Oil relubrication toward 400 r/min needs drain and level design; flooding the 336 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.
- The two roller rows must share load equally — a tilted spacer or unequal abutment on the 336 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.
- The cylindrical-bore 232/500B and its tapered-bore counterpart 232/500BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.
- Minimum load must be maintained even at rest under vibration: an unloaded 232/500B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.
- The 10500/17800 kN ratings, 1100 kN Pu and 1000000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/500B (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 232/500B?
232/500B is an NTN double-row spherical roller bearing to ISO 15: 500 mm bore, 920 mm OD and 336 mm width (19.685 × 36.22 × 13.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 10500 kN, C0 17800 kN, Pu 1100 kN, grease limiting speed 310 r/min, oil 400 r/min, mass about 1000000 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?
232/500B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 232/500BK (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. 232/500B is the basic execution.
What do D1 and W33 mean on 232/500B?
232/500B 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 232/500B 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 — 10500 kN C / 17800 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.