22207EMKW33 bearing: complete specifications & equivalents
The 22207EMKW33 is a ISO 15 radial bearing sized 35 x 72 x 23 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 35 mm |
| Outer diameter D | 72 mm |
| Width B | 23 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass, machined (M1) |
| Basic dynamic load rating C | 100 kN |
| Basic static load rating C0 | 92 kN |
| Fatigue load limit Pu | 6.11 kN |
| Limiting speed (mechanical) | 7500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 433 g |
| Manufacturer designation | NTN 22207EMKW33 |
| 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 | 1.378 in |
|---|---|
| Outer diameter D | 2.835 in |
| Width B | 0.906 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 18.5 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) | 3 of 32 |
| Bore above smallest 22200-series size | 10 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 22207EMW33 | 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 22207EMW33 — 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 22207EMKW33 model number is decoded
For heavy radial load with misalignment on a 35 mm shaft, NTN supplies 22207EMKW33: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 9,400 r/min. Numbering ties 22207EMKW33 to its envelope and execution: same-number EA versus EM or plain variants share the 35 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 18.5 mm radial section over the 35 mm bore carries two roller rows; capacity per millimetre of bore is about 2.9 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Pu 6.11 kN against C0 92 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22207EMKW33 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 23 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.
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
- machined EM cage wear from inadequate oil film at the cage-guiding surfaces
- roller-end smearing during skidding starts under light load and high viscosity grease
- asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range
- brinelling from static overload or a hammer blow during sleeve mounting
Selection pitfalls — read before you substitute
- Vibrating-duty 35 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22207EMKW33 is greased for life.
- Oil relubrication toward 9,400 r/min needs drain and level design; flooding the 23 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.
- Never substitute 22207EMKW33 by envelope alone: the 92 kN C0 and 6.11 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.
- Oil relubrication toward 9,400 r/min needs drain and level design; flooding the 23 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.
- The 1:12 tapered bore is the only difference from the cylindrical-bore 22207EMW33: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.
- The 100/92 kN ratings, 6.11 kN Pu and 433 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22207EMKW33 (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 22207EMKW33?
22207EMKW33 is an NTN double-row spherical roller bearing to ISO 15: 35 mm bore, 72 mm OD and 23 mm width (1.378 × 2.835 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 100 kN, C0 92 kN, Pu 6.11 kN, grease limiting speed 7,500 r/min, oil 9,400 r/min, mass about 433 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. 22207EMKW33 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 22207EMW33.
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. 22207EMKW33 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark.
What do D1 and W33 mean on 22207EMKW33?
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; 22207EMKW33 carries W33.
How much misalignment and axial load can 22207EMKW33 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 — 100 kN C / 92 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.