23038EAD1 bearing: complete specifications & equivalents
The 23038EAD1 is a ISO 15 radial bearing sized 190 x 290 x 75 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 | 290 mm |
| Width B | 75 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 1140 kN |
| Basic static load rating C0 | 1570 kN |
| Fatigue load limit Pu | 83.5 kN |
| Limiting speed (mechanical) | 1500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 17800 g |
| Manufacturer designation | NTN 23038EAD1 |
| 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 & 23000-series range
| Bore d | 7.48 in |
|---|---|
| Outer diameter D | 11.417 in |
| Width B | 2.953 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 50 mm |
| Smallest bore in 23000-series | 70 mm |
| Largest outer diameter in 23000-series | 1580 mm |
| Width range across 23000-series | 27–345 mm |
| Bore position in 23000-series (smallest first) | 16 of 46 |
| Bore above smallest 23000-series size | 120 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 23038EAKD1 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23038EAKD1 (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 23038EAD1 model number is decoded
The NTN order number 23038EAD1 identifies a 190×290×75 mm (7.48 × 11.417 × 2.953 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 23038EAD1 is assembled exactly in that order. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EA pressed-steel-cage cage. 190 mm bore is 7.48 in and 290 mm OD is 11.417 in; the ISO 15 envelope swaps between brands, but the 1140/1570 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 75 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.
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
- 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
- water-induced pitting in washdown or outdoor duty without effective external seals
- false brinelling on stopped machines exposed to screen or crusher vibration
Selection pitfalls — read before you substitute
- At 190 mm bore 23038EAD1 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.
- Minimum load must be maintained even at rest under vibration: an unloaded 23038EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.
- Oil relubrication toward 1,900 r/min needs drain and level design; flooding the 75 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.
- Oil relubrication toward 1,900 r/min needs drain and level design; flooding the 75 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.
- Never substitute 23038EAD1 by envelope alone: the 1570 kN C0 and 83.5 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.
- The 1140/1570 kN ratings, 83.5 kN Pu and 17800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23038EAD1 (EA pressed-steel-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 23038EAD1?
23038EAD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 290 mm OD and 75 mm width (7.48 × 11.417 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1140 kN, C0 1570 kN, Pu 83.5 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 17800 g. It is open, with pressed sheet-steel window cage (EA high-capacity design).
What is the difference between the K/K30 tapered bore and the cylindrical bore versions?
23038EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23038EAKD1 (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. 23038EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark.
What do D1 and W33 mean on 23038EAD1?
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. 23038EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions.
How much misalignment and axial load can 23038EAD1 take?
The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1140 kN C / 1570 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.