24148EMD1 bearing: complete specifications & equivalents
The 24148EMD1 is a ISO 15 radial bearing sized 240 x 400 x 160 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 240 mm |
| Outer diameter D | 400 mm |
| Width B | 160 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass, machined (M1) |
| Basic dynamic load rating C | 2910 kN |
| Basic static load rating C0 | 4290 kN |
| Fatigue load limit Pu | 142 kN |
| Limiting speed (mechanical) | 960 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 81000 g |
| Manufacturer designation | NTN 24148EMD1 |
| 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 | 9.449 in |
|---|---|
| Outer diameter D | 15.748 in |
| Width B | 6.299 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 80 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) | 13 of 32 |
| Bore above smallest 24100-series size | 140 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 24148EMK30D1 | 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 24148EMK30D1 (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 24148EMD1 model number is decoded
24148EMD1 belongs to the 24100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 240 mm (two-digit code ×5, with the 00–03 exception table), and 400 mm OD / 160 mm width follow the general plan. Suffix reading on 24148EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. 240 mm bore is 9.449 in and 400 mm OD is 15.748 in; the ISO 15 envelope swaps between brands, but the 2910/4290 kN ratings and cage design are NTN 2203E values. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 240 mm bore assembly by hand to distribute it across both rows.
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
- lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply
- pressed EA cage fatigue under sustained vibration when minimum load is not maintained
- 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
- hard-particle indentation through the open arrangement in dusty mining duty
Selection pitfalls — read before you substitute
- At 240 mm bore 24148EMD1 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.
- Never substitute 24148EMD1 by envelope alone: the 4290 kN C0 and 142 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.
- Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 960 r/min grease rating is lost to abrasive wear long before fatigue.
- The cylindrical-bore 24148EMD1 and its tapered-bore counterpart 24148EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.
- The two roller rows must share load equally — a tilted spacer or unequal abutment on the 160 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.
- The 2910/4290 kN ratings, 142 kN Pu and 81000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24148EMD1 (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 24148EMD1?
24148EMD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 400 mm OD and 160 mm width (9.449 × 15.748 × 6.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2910 kN, C0 4290 kN, Pu 142 kN, grease limiting speed 960 r/min, oil 1,200 r/min, mass about 81000 g. It is open, with one-piece machined brass cage (EM high-capacity design).
What is the difference between the K/K30 tapered bore and the cylindrical bore versions?
24148EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24148EMK30D1 (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. 24148EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark.
What do D1 and W33 mean on 24148EMD1?
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. 24148EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions.
How much misalignment and axial load can 24148EMD1 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 — 2910 kN C / 4290 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.