24056EMK30D1 bearing: complete specifications & equivalents
The 24056EMK30D1 is a ISO 15 radial bearing sized 280 x 420 x 140 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 280 mm |
| Outer diameter D | 420 mm |
| Width B | 140 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass, machined (M1) |
| Basic dynamic load rating C | 2620 kN |
| Basic static load rating C0 | 4060 kN |
| Fatigue load limit Pu | 150 kN |
| Limiting speed (mechanical) | 880 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 66300 g |
| Manufacturer designation | NTN 24056EMK30D1 |
| 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 & 24000-series range
| Bore d | 11.024 in |
|---|---|
| Outer diameter D | 16.535 in |
| Width B | 5.512 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 70 mm |
| Smallest bore in 24000-series | 65 mm |
| Largest outer diameter in 24000-series | 1580 mm |
| Width range across 24000-series | 35–462 mm |
| Bore position in 24000-series (smallest first) | 17 of 42 |
| Bore above smallest 24000-series size | 215 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 24056EMD1 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24056EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. 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 24056EMK30D1 model number is decoded
24056EMK30D1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 280 mm shaft — 2620 kN basic dynamic capacity in a 66300 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K30), lubrication feature (D1); 24056EMK30D1 is assembled exactly in that order. Pu 150 kN is the catalogue fatigue load limit for 24056EMK30D1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. 280 mm bore is 11.024 in and 420 mm OD is 16.535 in; the ISO 15 envelope swaps between brands, but the 2620/4060 kN ratings and cage design are NTN 2203E values. Mount 24056EMK30D1 on its adapter or withdrawal sleeve on the 280 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.
Typical equipment & failure modes
Common applications
- mining shovel and dragline swing shafts
- cement-rotary-kiln support and trunnion rolls
- large SAG/ball-mill trunnion and pinion shafts
- heavy vibrating screens and grizzly feeders
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
- water-induced pitting in washdown or outdoor duty without effective external seals
Selection pitfalls — read before you substitute
- At 280 mm bore 24056EMK30D1 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.
- Adapter-sleeve mounting requires the correct sleeve series and locknut for the 280 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.
- Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 880 r/min grease rating is lost to abrasive wear long before fatigue.
- The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24056EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.
- The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24056EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.
- The 2620/4060 kN ratings, 150 kN Pu and 66300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24056EMK30D1 (EM machined-brass-cage/D1); 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 24056EMK30D1?
24056EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 420 mm OD and 140 mm width (11.024 × 16.535 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2620 kN, C0 4060 kN, Pu 150 kN, grease limiting speed 880 r/min, oil 1,100 r/min, mass about 66300 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore.
What is the difference between the K/K30 tapered bore and the cylindrical bore versions?
K30 denotes a 1:30 tapered bore (the wide 24000 series). 24056EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 280 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24056EMD1.
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. 24056EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark.
What do D1 and W33 mean on 24056EMK30D1?
D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24056EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions.
How much misalignment and axial load can 24056EMK30D1 take?
The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2620 kN C / 4060 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.