22248EMKD1 bearing: complete specifications & equivalents
The 22248EMKD1 is a ISO 15 radial bearing sized 240 x 440 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 | 240 mm |
| Outer diameter D | 440 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 | 2470 kN |
| Basic static load rating C0 | 3110 kN |
| Fatigue load limit Pu | 159 kN |
| Limiting speed (mechanical) | 1060 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 80900 g |
| Manufacturer designation | NTN 22248EMKD1 |
| 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 & 22200-series range
| Bore d | 9.449 in |
|---|---|
| Outer diameter D | 17.323 in |
| Width B | 4.724 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 100 mm |
| Smallest bore in 22200-series | 25 mm |
| Largest outer diameter in 22200-series | 580 mm |
| Width range across 22200-series | 18–150 mm |
| Bore position in 22200-series (smallest first) | 28 of 32 |
| Bore above smallest 22200-series size | 215 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 22248EMD1 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22248EMD1 — 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 22248EMKD1 model number is decoded
NTN lists 22248EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 240 mm bore, 440 mm OD, 120 mm width, rated 1,060 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 22248EMKD1 is assembled exactly in that order. NTN prints two speeds for 22248EMKD1: 1,060 r/min grease and 1,350 r/min oil — the gap of 290 r/min reflects oil cooling of the heavy roller set. The 100.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 120 mm-wide ring seats fully on both sides. Mount 22248EMKD1 on its adapter or withdrawal sleeve on the 240 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.
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
- 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
- fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient
- hard-particle indentation through the open arrangement in dusty mining duty
Selection pitfalls — read before you substitute
- At 240 mm bore 22248EMKD1 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.
- Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,060 r/min grease rating is lost to abrasive wear long before fatigue.
- Do not confuse EA and EM at the same number: 22248EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 240×440 mm envelope is identical.
- Never substitute 22248EMKD1 by envelope alone: the 3110 kN C0 and 159 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.
- Oil relubrication toward 1,350 r/min needs drain and level design; flooding the 120 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.
- The 2470/3110 kN ratings, 159 kN Pu and 80900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22248EMKD1 (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 22248EMKD1?
22248EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 440 mm OD and 120 mm width (9.449 × 17.323 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2470 kN, C0 3110 kN, Pu 159 kN, grease limiting speed 1,060 r/min, oil 1,350 r/min, mass about 80900 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore.
What is the difference between the K/K30 tapered bore and the cylindrical bore versions?
K denotes a 1:12 tapered bore. 22248EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22248EMD1.
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. 22248EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark.
What do D1 and W33 mean on 22248EMKD1?
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. 22248EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions.
How much misalignment and axial load can 22248EMKD1 take?
The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2470 kN C / 3110 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.