22206EMW33 bearing: complete specifications & equivalents
The 22206EMW33 is a ISO 15 radial bearing sized 30 x 62 x 20 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 30 mm |
| Outer diameter D | 62 mm |
| Width B | 20 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass, machined (M1) |
| Basic dynamic load rating C | 75.7 kN |
| Basic static load rating C0 | 64.5 kN |
| Fatigue load limit Pu | 4.58 kN |
| Limiting speed (mechanical) | 8800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 281 g |
| Manufacturer designation | NTN 22206EMW33 |
| 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 | 1.181 in |
|---|---|
| Outer diameter D | 2.441 in |
| Width B | 0.787 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 16 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) | 2 of 32 |
| Bore above smallest 22200-series size | 5 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 22206EMKW33 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22206EMKW33 (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 22206EMW33 model number is decoded
22206EMW33 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 30×62×20 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Numbering ties 22206EMW33 to its envelope and execution: same-number EA versus EM or plain variants share the 30 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Equivalent-load planning keeps a radial plus moderate axial combination on 22206EMW33; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22206EMW33 leaves sealing and the C3/C4 clearance decision to the application drawing.
Typical equipment & failure modes
Common applications
- pump and fan shafts under heavy belt load
- marine propulsion auxiliary shafts
- vibrating screen and feeder shafts
- industrial gearbox and reducer shafts
Known failure patterns
- lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply
- cage damage when a mounting force is applied through the roller set instead of the ring face
- 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
- asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range
Selection pitfalls — read before you substitute
- Vibrating-duty 30 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22206EMW33 is greased for life.
- Adapter-sleeve mounting requires the correct sleeve series and locknut for the 30 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.
- Oil relubrication toward 11,000 r/min needs drain and level design; flooding the 20 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.
- Never substitute 22206EMW33 by envelope alone: the 64.5 kN C0 and 4.58 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.
- Minimum load must be maintained even at rest under vibration: an unloaded 22206EMW33 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.
- The 75.7/64.5 kN ratings, 4.58 kN Pu and 281 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22206EMW33 (EM machined-brass-cage/W33); 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 22206EMW33?
22206EMW33 is an NTN double-row spherical roller bearing to ISO 15: 30 mm bore, 62 mm OD and 20 mm width (1.181 × 2.441 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 75.7 kN, C0 64.5 kN, Pu 4.58 kN, grease limiting speed 8,800 r/min, oil 11,000 r/min, mass about 281 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?
22206EMW33 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22206EMKW33 (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. 22206EMW33 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark.
What do D1 and W33 mean on 22206EMW33?
W33 denotes the annular lubrication groove with holes in the outer ring: the housing grease port feeds the groove and both roller rows directly. On NTN executions the same feature is spelled D1 in the NTN suffix language; 22206EMW33 carries W33.
How much misalignment and axial load can 22206EMW33 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 — 75.7 kN C / 64.5 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.