QJ215 bearing: complete specifications & equivalents
The QJ215 is a ISO 15 radial bearing sized 75 x 130 x 25 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 75 mm |
| Outer diameter D | 130 mm |
| Width B | 25 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 106 kN |
| Basic static load rating C0 | 183 kN |
| Fatigue load limit Pu | 7.55 kN |
| Limiting speed (mechanical) | 3800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1530 g |
| Manufacturer designation | NTN QJ215 |
| 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 | 2.953 in |
|---|---|
| Outer diameter D | 5.118 in |
| Width B | 0.984 in |
| ISO bore code | 15 |
| Radial section height (D−d)/2 | 27.5 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) | 13 of 29 |
| Bore above smallest QJ200-series size | 60 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the QJ215 model number is decoded
At 75 x 130 x 25 mm, NTN QJ215 sits in the medium-duty QJ200 four-point family of the angular-contact programme. Decoding QJ215: QJ2 is the four-point dimension series (medium-duty QJ200 four-point family), with the last two digits 15 give the bore by the standard code table (75 mm); there is no suffix — the split inner ring and 35 deg contact angle are inherent to the QJ design. At roughly 27.5 mm of radial section, the catalogue still quotes 106 kN dynamic capacity for the 75 mm bore. Against a deep-groove bearing of the same 75 mm bore, this bearing trades some pure-radial comfort for real one-direction thrust capacity and higher running accuracy. A 75 mm shaft typically takes a k5/m5 fit for rotating inner-ring load; keep the housing bore to G6/H6 class so the contact geometry is not distorted.
Typical equipment & failure modes
Common applications
- marine auxiliary and winch gearbox shafts
- rolling-mill and metalworking drive shafts
- large pump, fan and compressor rotor shafts
- crane and hoist gearbox 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
- resin-cage cracking on the 7900-series sizes after hot, dry running or solvent attack on the polymer
- current-erosion pitting on VFD-driven motor shafts, first visible as a grey frosted band across both raceways
- current-erosion pitting on VFD-driven motor shafts, first visible as a grey frosted band across both raceways
Selection pitfalls — read before you substitute
- Bearings of 75 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.
- Never use a four-point or double-row bearing as a like-for-like swap for a single QJ215 without re-checking axial float, heat and housing width — the kinematics differ.
- 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.
- Catalogue mass and ratings belong to the open execution; shields, seals and resin cages change both the speed ceiling and the thermal behaviour of the same basic size.
- The 106/183 kN ratings and 7.55 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for QJ215; 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 QJ215?
QJ215 is a four-point contact ball bearing to ISO 15: 75 mm bore, 130 mm outside diameter, 25 mm width (2.953 x 5.118 x 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 106 kN, C0 183 kN and a 7.55 kN fatigue load limit Pu; the grease limiting speed is 3,800 r/min and the oil rating 5,000 r/min; mass about 1530 g.
How is the QJ215 designation structured?
QJ2 is the four-point dimension series (medium-duty QJ200 four-point family); the last two digits 15 give the bore by the standard code table (75 mm); there is no suffix — the split inner ring and 35 deg contact angle are inherent to the QJ design. The 130 mm OD and 25 mm width follow the ISO 15 boundary-dimension plan for that series.
Which axial direction does QJ215 support?
QJ215 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 QJ215?
Per NTN Ball and Roller Bearings CAT.No.2203E, the grease limiting speed is 3,800 r/min and the oil rating 5,000 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 QJ215?
The 75/130/25 mm envelope is ISO 15 interchangeable, but internal geometry — contact angle, osculation, cage and shoulder details — is maker-specific. Re-verify C 106 kN / C0 183 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.