24156EMK30D1 bearing: complete specifications & equivalents
The 24156EMK30D1 is a ISO 15 radial bearing sized 280 x 460 x 180 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 | 460 mm |
| Width B | 180 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass, machined (M1) |
| Basic dynamic load rating C | 3550 kN |
| Basic static load rating C0 | 5450 kN |
| Fatigue load limit Pu | 167 kN |
| Limiting speed (mechanical) | 810 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 117000 g |
| Manufacturer designation | NTN 24156EMK30D1 |
| 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 | 11.024 in |
|---|---|
| Outer diameter D | 18.11 in |
| Width B | 7.087 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 90 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) | 15 of 32 |
| Bore above smallest 24100-series size | 180 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 24156EMD1 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24156EMD1 — 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 24156EMK30D1 model number is decoded
24156EMK30D1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 280×460×180 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 280 mm (two-digit code ×5, with the 00–03 exception table), and 460 mm OD / 180 mm width follow the general plan. Pu 167 kN is the catalogue fatigue load limit for 24156EMK30D1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Pu 167 kN against C0 5450 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24156EMK30D1 moves with cleanliness far more than with small C variations. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.
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
- 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
- brinelling from static overload or a hammer blow during sleeve mounting
- false brinelling on stopped machines exposed to screen or crusher vibration
Selection pitfalls — read before you substitute
- At 280 mm bore 24156EMK30D1 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.
- Oil relubrication toward 1,030 r/min needs drain and level design; flooding the 180 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.
- The two roller rows must share load equally — a tilted spacer or unequal abutment on the 180 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.
- Do not confuse EA and EM at the same number: 24156EMK30D1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 280×460 mm envelope is identical.
- The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24156EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.
- The 3550/5450 kN ratings, 167 kN Pu and 117000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24156EMK30D1 (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 24156EMK30D1?
24156EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 460 mm OD and 180 mm width (11.024 × 18.11 × 7.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3550 kN, C0 5450 kN, Pu 167 kN, grease limiting speed 810 r/min, oil 1,030 r/min, mass about 117000 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 24100 series). 24156EMK30D1 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 24156EMD1.
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. 24156EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark.
What do D1 and W33 mean on 24156EMK30D1?
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. 24156EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions.
How much misalignment and axial load can 24156EMK30D1 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 — 3550 kN C / 5450 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.