23144EMD1 bearing: complete specifications & equivalents
The 23144EMD1 is a ISO 15 radial bearing sized 220 x 370 x 120 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 220 mm |
| Outer diameter D | 370 mm |
| Width B | 120 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass, machined (M1) |
| Basic dynamic load rating C | 2190 kN |
| Basic static load rating C0 | 2940 kN |
| Fatigue load limit Pu | 128 kN |
| Limiting speed (mechanical) | 1000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 52300 g |
| Manufacturer designation | NTN 23144EMD1 |
| 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 & 23100-series range
| Bore d | 8.661 in |
|---|---|
| Outer diameter D | 14.567 in |
| Width B | 4.724 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 75 mm |
| Smallest bore in 23100-series | 100 mm |
| Largest outer diameter in 23100-series | 1420 mm |
| Width range across 23100-series | 52–412 mm |
| Bore position in 23100-series (smallest first) | 12 of 36 |
| Bore above smallest 23100-series size | 120 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 23144EMKD1 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23144EMKD1 (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 23144EMD1 model number is decoded
NTN lists 23144EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 220 mm bore, 370 mm OD, 120 mm width, rated 1,000 r/min on grease. Numbering ties 23144EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 220 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Two symmetric roller rows share the load: C 2190 kN, C0 2940 kN (C0/C ≈ 1.34), with useful axial capacity in either direction alongside the dominant radial load. Speed planning: 1,000 r/min grease limiting speed is the cage/kinematic ceiling and 1,300 r/min is the oil-lubricated value for the 220 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 220 mm bore assembly by hand to distribute it across both rows.
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
- 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
- roller-end smearing during skidding starts under light load and high viscosity grease
- false brinelling on stopped machines exposed to screen or crusher vibration
- asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range
Selection pitfalls — read before you substitute
- At 220 mm bore 23144EMD1 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.
- Do not confuse EA and EM at the same number: 23144EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 220×370 mm envelope is identical.
- 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 220 mm bearing, and drive-up procedures differ.
- Do not confuse EA and EM at the same number: 23144EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 220×370 mm envelope is identical.
- Adapter-sleeve mounting requires the correct sleeve series and locknut for the 220 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.
- The 2190/2940 kN ratings, 128 kN Pu and 52300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23144EMD1 (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 23144EMD1?
23144EMD1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 370 mm OD and 120 mm width (8.661 × 14.567 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2190 kN, C0 2940 kN, Pu 128 kN, grease limiting speed 1,000 r/min, oil 1,300 r/min, mass about 52300 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?
23144EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23144EMKD1 (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. 23144EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark.
What do D1 and W33 mean on 23144EMD1?
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. 23144EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions.
How much misalignment and axial load can 23144EMD1 take?
The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2190 kN C / 2940 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.