QJ222 bearing: complete specifications & equivalents
The QJ222 is a ISO 15 radial bearing sized 110 x 200 x 38 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 110 mm |
| Outer diameter D | 200 mm |
| Width B | 38 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 236 kN |
| Basic static load rating C0 | 450 kN |
| Fatigue load limit Pu | 15.5 kN |
| Limiting speed (mechanical) | 2500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 5620 g |
| Manufacturer designation | NTN QJ222 |
| 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 & QJ200-series range
| Bore d | 4.331 in |
|---|---|
| Outer diameter D | 7.874 in |
| Width B | 1.496 in |
| ISO bore code | 22 |
| Radial section height (D−d)/2 | 45 mm |
| Smallest bore in QJ200-series | 15 mm |
| Largest outer diameter in QJ200-series | 360 mm |
| Width range across QJ200-series | 11–58 mm |
| Bore position in QJ200-series (smallest first) | 20 of 29 |
| Bore above smallest QJ200-series size | 95 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the QJ222 model number is decoded
At 110 x 200 x 38 mm, NTN QJ222 sits in the medium-duty QJ200 four-point family of the angular-contact programme. Two fields make up the code — QJ2 is the four-point dimension series (medium-duty QJ200 four-point family) and the last two digits 22 give the bore by the standard code table (110 mm); there is no suffix — the split inner ring and 35 deg contact angle are inherent to the QJ design. Catalogue dynamic rating C is 236 kN against C0 450 kN — a C0/C ratio of 1.91 that is typical of an angular-contact contact ellipse. When axial load reverses, specify the bearing as a matched pair (DB, DF or DT) instead of two random singles — the catalogue right-hand columns give the paired ratings for exactly this reason. Heat-mounting to 80-90 deg C is the clean route onto a 110 mm shaft; drive-fits through the balls transmit force through the contact ellipse and can brinell it.
Typical equipment & failure modes
Common applications
- large pump, fan and compressor rotor shafts
- crane and hoist gearbox shafts
- paper-machine roll and calendar drives
- extruder and mixer gearbox output shafts
Known failure patterns
- impact brinelling dents on the 30 deg contact path after a shaft-side hammer blow during mounting, because axial shock travels straight through the contact angle
- thermal runaway from excessive preload: the pair runs hot, grease darkens and the contact ellipse spreads until the raceways smear
- machined-cage land scoring when a high-speed spindle runs past its grease rating and the cage runs dry on its guidance surface
- edge loading and early spalling from housing bores that are out of round or shoulders that are too small for the ring face
- contamination-induced denting — hard particles rolled into the contact ellipse become the initiation points for surface fatigue
Selection pitfalls — read before you substitute
- Bearings of 110 mm bore arrive heavy enough that handling damage (dents from slings, tilting on the shaft) is a real failure precursor — use proper lifting and heating kit.
- The QJ split inner ring must be clamped by the shaft nut/shoulder on both halves — assembling it against a single small shoulder leaves one half-ring free to walk.
- The C0 of 450 kN is a static rating, not a permissible running thrust — sizing continuous axial load from C0 alone is a recurring drawing-office error.
- A single-row angular contact left loose on the shaft to "help assembly" will fret the seat: the contact angle keeps driving the ring axially under load.
- Substituting the B (40 deg) execution for the standard 30 deg bearing changes the axial/radial load split — the shaft position and the mating bearing see different forces even though the envelope is identical.
- The 236/450 kN ratings and 15.5 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for QJ222; internal geometry legitimately differs between manufacturers, so re-verify ratings, contact angle and suffix before substituting another make on a rated drive.
Frequently asked questions
What are the dimensions and catalogue ratings of NTN QJ222?
QJ222 is a four-point contact ball bearing to ISO 15: 110 mm bore, 200 mm outside diameter, 38 mm width (4.331 x 7.874 x 1.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 236 kN, C0 450 kN and a 15.5 kN fatigue load limit Pu; the grease limiting speed is 2,500 r/min and the oil rating 3,400 r/min; mass about 5620 g.
How is the QJ222 designation structured?
QJ2 is the four-point dimension series (medium-duty QJ200 four-point family); the last two digits 22 give the bore by the standard code table (110 mm); there is no suffix — the split inner ring and 35 deg contact angle are inherent to the QJ design. The 200 mm OD and 38 mm width follow the ISO 15 boundary-dimension plan for that series.
Which axial direction does QJ222 support?
QJ222 is a four-point contact bearing: the split inner ring lets each ball touch the raceways at two points, so one bearing locates the shaft in both axial directions at its 35 deg contact angle. It is normally mounted with slight radial clearance against the housing as the axial-locating member.
What lubrication speeds does NTN print for QJ222?
Per NTN Ball and Roller Bearings CAT.No.2203E, the grease limiting speed is 2,500 r/min and the oil rating 3,400 r/min. These are catalogue ceilings for a correctly mounted bearing with the stated lubricant; preload, fill quantity, ambient heat and paired arrangements all move the real limit.
What should be checked before substituting another make for QJ222?
The 110/200/38 mm envelope is ISO 15 interchangeable, but internal geometry — contact angle, osculation, cage and shoulder details — is maker-specific. Re-verify C 236 kN / C0 450 kN, the speed figures, contact angle and suffix meaning against the donor catalogue before swapping on a rated drive.
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.