QJ218 bearing: complete specifications & equivalents
The QJ218 is a ISO 15 radial bearing sized 90 x 160 x 30 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 90 mm |
| Outer diameter D | 160 mm |
| Width B | 30 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 164 kN |
| Basic static load rating C0 | 293 kN |
| Fatigue load limit Pu | 11.1 kN |
| Limiting speed (mechanical) | 3100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2760 g |
| Manufacturer designation | NTN QJ218 |
| 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 | 3.543 in |
|---|---|
| Outer diameter D | 6.299 in |
| Width B | 1.181 in |
| ISO bore code | 18 |
| Radial section height (D−d)/2 | 35 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) | 16 of 29 |
| Bore above smallest QJ200-series size | 75 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the QJ218 model number is decoded
QJ218 is an NTN four-point contact ball bearing: medium-duty QJ200 four-point family, listed in NTN Ball and Roller Bearings CAT.No.2203E at 90 x 160 x 30 mm. Reading the code: QJ2 is the four-point dimension series (medium-duty QJ200 four-point family), the last two digits 18 give the bore by the standard code table (90 mm); there is no suffix — the split inner ring and 35 deg contact angle are inherent to the QJ design. Catalogue mass is about 2760 g, which at this 35.0 mm radial section keeps the bearing comfortably inside high-speed spindle weight budgets. Where the same envelope must also be sealed, or where mounting mistakes are likely, compare with the double-row 52/53 catalogue pages before fixing the bill of materials. Heat-mounting to 80-90 deg C is the clean route onto a 90 mm shaft; drive-fits through the balls transmit force through the contact ellipse and can brinell it.
Typical equipment & failure modes
Common applications
- mining conveyor head-shaft positions
- marine auxiliary and winch gearbox shafts
- rolling-mill and metalworking drive shafts
- large pump, fan and compressor rotor shafts
Known failure patterns
- false brinelling on the raceway contact ellipses when a preloaded spindle sits vibrating at standstill — visible as evenly spaced flute-like wear at ball pitch
- loss of preload after housing-fret or shaft creep, leaving the pair loose — ball skidding, cage rattle and a falling natural frequency follow
- resin-cage cracking on the 7900-series sizes after hot, dry running or solvent attack on the polymer
- contamination-induced denting — hard particles rolled into the contact ellipse become the initiation points for surface fatigue
- edge loading and early spalling from housing bores that are out of round or shoulders that are too small for the ring face
Selection pitfalls — read before you substitute
- Bearings of 90 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.
- A QJ218 mounted the wrong way round still turns smoothly by hand; the failure shows up weeks later as raceway flaking on the unloaded-looking side.
- A QJ218 mounted the wrong way round still turns smoothly by hand; the failure shows up weeks later as raceway flaking on the unloaded-looking side.
- If the application vibrates at standstill (transport, idle machine next to a running line), specify protection: the contact ellipse of a preloaded bearing false-brinells faster than a loose one.
- The 164/293 kN ratings and 11.1 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for QJ218; 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 QJ218?
QJ218 is a four-point contact ball bearing to ISO 15: 90 mm bore, 160 mm outside diameter, 30 mm width (3.543 x 6.299 x 1.181 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 164 kN, C0 293 kN and a 11.1 kN fatigue load limit Pu; the grease limiting speed is 3,100 r/min and the oil rating 4,200 r/min; mass about 2760 g.
How is the QJ218 designation structured?
QJ2 is the four-point dimension series (medium-duty QJ200 four-point family); the last two digits 18 give the bore by the standard code table (90 mm); there is no suffix — the split inner ring and 35 deg contact angle are inherent to the QJ design. The 160 mm OD and 30 mm width follow the ISO 15 boundary-dimension plan for that series.
Which axial direction does QJ218 support?
QJ218 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 QJ218?
Per NTN Ball and Roller Bearings CAT.No.2203E, the grease limiting speed is 3,100 r/min and the oil rating 4,200 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 QJ218?
The 90/160/30 mm envelope is ISO 15 interchangeable, but internal geometry — contact angle, osculation, cage and shoulder details — is maker-specific. Re-verify C 164 kN / C0 293 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.