23080B bearing: complete specifications & equivalents
The 23080B is a ISO 15 radial bearing sized 400 x 600 x 148 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 400 mm |
| Outer diameter D | 600 mm |
| Width B | 148 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 3300 kN |
| Basic static load rating C0 | 6050 kN |
| Fatigue load limit Pu | 450 kN |
| Limiting speed (mechanical) | 520 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 149000 g |
| Manufacturer designation | NTN 23080B |
| 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 & 23000-series range
| Bore d | 15.748 in |
|---|---|
| Outer diameter D | 23.622 in |
| Width B | 5.827 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 100 mm |
| Smallest bore in 23000-series | 70 mm |
| Largest outer diameter in 23000-series | 1580 mm |
| Width range across 23000-series | 27–345 mm |
| Bore position in 23000-series (smallest first) | 27 of 46 |
| Bore above smallest 23000-series size | 330 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 23080BK | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23080BK (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 23080B model number is decoded
23080B belongs to the 23000 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Digit by digit the code reads as spherical-roller dimension series plus 400 mm bore; the 148 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The cylindrical bore fits a machined 400 mm shaft seat directly; the same envelope in 23080BK (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Pu 450 kN against C0 6050 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23080B moves with cleanliness far more than with small C variations. Fit the cylindrical-bore 23080B 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
- heavy vibrating screens and grizzly feeders
- offshore and marine propulsion shaftlines
- large wind-turbine main-shaft arrangements
- steel-mill and heavy crusher main shafts
Known failure patterns
- lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply
- cage damage when a mounting force is applied through the roller set instead of the ring face
- 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
- rolling-contact fatigue after the catalogue L10 life at the actual load
Selection pitfalls — read before you substitute
- At 400 mm bore 23080B 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 23080B and its tapered-bore counterpart 23080BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.
- Oil relubrication toward 680 r/min needs drain and level design; flooding the 148 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.
- 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 400 mm bearing, and drive-up procedures differ.
- Do not confuse EA and EM at the same number: 23080B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 400×600 mm envelope is identical.
- The 3300/6050 kN ratings, 450 kN Pu and 149000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23080B (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 23080B?
23080B is an NTN double-row spherical roller bearing to ISO 15: 400 mm bore, 600 mm OD and 148 mm width (15.748 × 23.622 × 5.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3300 kN, C0 6050 kN, Pu 450 kN, grease limiting speed 520 r/min, oil 680 r/min, mass about 149000 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?
23080B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23080BK (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. 23080B is the basic execution.
What do D1 and W33 mean on 23080B?
23080B 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 23080B take?
The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3300 kN C / 6050 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.