24138EMD1 bearing: complete specifications & equivalents
The 24138EMD1 is a ISO 15 radial bearing sized 190 x 320 x 128 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 190 mm |
| Outer diameter D | 320 mm |
| Width B | 128 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass, machined (M1) |
| Basic dynamic load rating C | 1900 kN |
| Basic static load rating C0 | 2700 kN |
| Fatigue load limit Pu | 96.8 kN |
| Limiting speed (mechanical) | 1200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 42100 g |
| Manufacturer designation | NTN 24138EMD1 |
| 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 | 7.48 in |
|---|---|
| Outer diameter D | 12.598 in |
| Width B | 5.039 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 65 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) | 10 of 32 |
| Bore above smallest 24100-series size | 90 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 24138EMK30D1 | 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 24138EMK30D1 (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 24138EMD1 model number is decoded
24138EMD1 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. Reading the full code: the number gives the 190×320 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. Two symmetric roller rows share the load: C 1900 kN, C0 2700 kN (C0/C ≈ 1.42), with useful axial capacity in either direction alongside the dominant radial load. 190 mm bore is 7.48 in and 320 mm OD is 12.598 in; the ISO 15 envelope swaps between brands, but the 1900/2700 kN ratings and cage design are NTN 2203E values. Fit the cylindrical-bore 24138EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.
Typical equipment & failure modes
Common applications
- cement-rotary-kiln support and trunnion rolls
- large SAG/ball-mill trunnion and pinion shafts
- heavy vibrating screens and grizzly feeders
- offshore and marine propulsion shaftlines
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
- sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path
- 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 190 mm bore 24138EMD1 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 1,500 r/min needs drain and level design; flooding the 128 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.
- Never substitute 24138EMD1 by envelope alone: the 2700 kN C0 and 96.8 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 1,200 r/min grease rating is lost to abrasive wear long before fatigue.
- Adapter-sleeve mounting requires the correct sleeve series and locknut for the 190 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.
- The 1900/2700 kN ratings, 96.8 kN Pu and 42100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24138EMD1 (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 24138EMD1?
24138EMD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 320 mm OD and 128 mm width (7.48 × 12.598 × 5.039 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1900 kN, C0 2700 kN, Pu 96.8 kN, grease limiting speed 1,200 r/min, oil 1,500 r/min, mass about 42100 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?
24138EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24138EMK30D1 (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. 24138EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark.
What do D1 and W33 mean on 24138EMD1?
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. 24138EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions.
How much misalignment and axial load can 24138EMD1 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 — 1900 kN C / 2700 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.