23272B bearing: complete specifications & equivalents
The 23272B is a ISO 15 radial bearing sized 360 x 650 x 232 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 360 mm |
| Outer diameter D | 650 mm |
| Width B | 232 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 5400 kN |
| Basic static load rating C0 | 8700 kN |
| Fatigue load limit Pu | 620 kN |
| Limiting speed (mechanical) | 450 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 339000 g |
| Manufacturer designation | NTN 23272B |
| 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 | 14.173 in |
|---|---|
| Outer diameter D | 25.591 in |
| Width B | 9.134 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 145 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) | 20 of 34 |
| Bore above smallest 23200-series size | 270 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 23272BK | 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 23272BK (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 23272B model number is decoded
23272B belongs to the 23200 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 23272B to its envelope and execution: same-number EA versus EM or plain variants share the 360 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. 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. 360 mm bore is 14.173 in and 650 mm OD is 25.591 in; the ISO 15 envelope swaps between brands, but the 5400/8700 kN ratings and cage design are NTN 2203E values. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 360 mm bore assembly by hand to distribute it across both rows.
Typical equipment & failure modes
Common applications
- large wind-turbine main-shaft arrangements
- steel-mill and heavy crusher main shafts
- mining shovel and dragline swing shafts
- cement-rotary-kiln support and trunnion rolls
Known failure patterns
- raceway spalling at the roller ends when misalignment or deflection concentrates the line contact
- cage damage when a mounting force is applied through the roller set instead of the ring face
- 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 360 mm bore 23272B 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.
- Minimum load must be maintained even at rest under vibration: an unloaded 23272B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.
- Oil relubrication toward 590 r/min needs drain and level design; flooding the 232 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.
- Never substitute 23272B by envelope alone: the 8700 kN C0 and 620 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.
- Minimum load must be maintained even at rest under vibration: an unloaded 23272B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.
- The 5400/8700 kN ratings, 620 kN Pu and 339000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23272B (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 23272B?
23272B is an NTN double-row spherical roller bearing to ISO 15: 360 mm bore, 650 mm OD and 232 mm width (14.173 × 25.591 × 9.134 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5400 kN, C0 8700 kN, Pu 620 kN, grease limiting speed 450 r/min, oil 590 r/min, mass about 339000 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?
23272B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23272BK (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. 23272B is the basic execution.
What do D1 and W33 mean on 23272B?
23272B 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 23272B 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 — 5400 kN C / 8700 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.