24176B bearing: complete specifications & equivalents
The 24176B is a ISO 15 radial bearing sized 380 x 620 x 243 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 380 mm |
| Outer diameter D | 620 mm |
| Width B | 243 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 5350 kN |
| Basic static load rating C0 | 9650 kN |
| Fatigue load limit Pu | 570 kN |
| Limiting speed (mechanical) | 450 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 292000 g |
| Manufacturer designation | NTN 24176B |
| 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 & 24100-series range
| Bore d | 14.961 in |
|---|---|
| Outer diameter D | 24.409 in |
| Width B | 9.567 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 120 mm |
| Smallest bore in 24100-series | 100 mm |
| Largest outer diameter in 24100-series | 1150 mm |
| Width range across 24100-series | 65–438 mm |
| Bore position in 24100-series (smallest first) | 20 of 32 |
| Bore above smallest 24100-series size | 280 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 24176BK30 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24176BK30 (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 24176B model number is decoded
24176B is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 380×620×243 mm to ISO 15, with pressed-steel cage (standard execution). The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 380 mm (two-digit code ×5, with the 00–03 exception table), and 620 mm OD / 243 mm width follow the general plan. 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. 380 mm bore is 14.961 in and 620 mm OD is 24.409 in; the ISO 15 envelope swaps between brands, but the 5350/9650 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 243 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.
Typical equipment & failure modes
Common applications
- offshore and marine propulsion shaftlines
- large wind-turbine main-shaft arrangements
- steel-mill and heavy crusher main shafts
- mining shovel and dragline swing shafts
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
- sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path
- rolling-contact fatigue after the catalogue L10 life at the actual load
- rolling-contact fatigue after the catalogue L10 life at the actual load
Selection pitfalls — read before you substitute
- At 380 mm bore 24176B 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 24176B and its tapered-bore counterpart 24176BK30 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.
- Do not confuse EA and EM at the same number: 24176B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 380×620 mm envelope is identical.
- Do not confuse EA and EM at the same number: 24176B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 380×620 mm envelope is identical.
- Minimum load must be maintained even at rest under vibration: an unloaded 24176B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.
- The 5350/9650 kN ratings, 570 kN Pu and 292000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24176B (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 24176B?
24176B is an NTN double-row spherical roller bearing to ISO 15: 380 mm bore, 620 mm OD and 243 mm width (14.961 × 24.409 × 9.567 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5350 kN, C0 9650 kN, Pu 570 kN, grease limiting speed 450 r/min, oil 590 r/min, mass about 292000 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?
24176B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24176BK30 (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. 24176B is the basic execution.
What do D1 and W33 mean on 24176B?
24176B 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 24176B take?
The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5350 kN C / 9650 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.