23184B bearing: complete specifications & equivalents
The 23184B is a ISO 15 radial bearing sized 420 x 700 x 224 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 420 mm |
| Outer diameter D | 700 mm |
| Width B | 224 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 5800 kN |
| Basic static load rating C0 | 9950 kN |
| Fatigue load limit Pu | 680 kN |
| Limiting speed (mechanical) | 410 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 354000 g |
| Manufacturer designation | NTN 23184B |
| 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 & 23100-series range
| Bore d | 16.535 in |
|---|---|
| Outer diameter D | 27.559 in |
| Width B | 8.819 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 140 mm |
| Smallest bore in 23100-series | 100 mm |
| Largest outer diameter in 23100-series | 1420 mm |
| Width range across 23100-series | 52–412 mm |
| Bore position in 23100-series (smallest first) | 22 of 36 |
| Bore above smallest 23100-series size | 320 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 23184BK | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23184BK (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 23184B model number is decoded
NTN lists 23184B with a cylindrical bore and plain outer ring (no D1/W33 groove): 420 mm bore, 700 mm OD, 224 mm width, rated 410 r/min on grease. Numbering ties 23184B to its envelope and execution: same-number EA versus EM or plain variants share the 420 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. The 140.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 224 mm-wide ring seats fully on both sides. Fit the cylindrical-bore 23184B with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.
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
- raceway spalling at the roller ends when misalignment or deflection concentrates the line contact
- machined EM cage wear from inadequate oil film at the cage-guiding surfaces
- micro-pitting when the EHL film is thinner than the raceway composite roughness
- fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient
- brinelling from static overload or a hammer blow during sleeve mounting
Selection pitfalls — read before you substitute
- At 420 mm bore 23184B 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 cylindrical-bore 23184B and its tapered-bore counterpart 23184BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.
- Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 410 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 224 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.
- Never substitute 23184B by envelope alone: the 9950 kN C0 and 680 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.
- The 5800/9950 kN ratings, 680 kN Pu and 354000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23184B (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 23184B?
23184B is an NTN double-row spherical roller bearing to ISO 15: 420 mm bore, 700 mm OD and 224 mm width (16.535 × 27.559 × 8.819 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5800 kN, C0 9950 kN, Pu 680 kN, grease limiting speed 410 r/min, oil 530 r/min, mass about 354000 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?
23184B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23184BK (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. 23184B is the basic execution.
What do D1 and W33 mean on 23184B?
23184B 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 23184B take?
The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5800 kN C / 9950 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.