QJ219 bearing: complete specifications & equivalents
The QJ219 is a ISO 15 radial bearing sized 95 x 170 x 32 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 95 mm |
| Outer diameter D | 170 mm |
| Width B | 32 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 186 kN |
| Basic static load rating C0 | 335 kN |
| Fatigue load limit Pu | 12.4 kN |
| Limiting speed (mechanical) | 3000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 3350 g |
| Manufacturer designation | NTN QJ219 |
| 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 | 3.74 in |
|---|---|
| Outer diameter D | 6.693 in |
| Width B | 1.26 in |
| ISO bore code | 19 |
| Radial section height (D−d)/2 | 37.5 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) | 17 of 29 |
| Bore above smallest QJ200-series size | 80 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the QJ219 model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, QJ219 appears as a medium-duty QJ200 four-point family bearing of 95 mm bore, 170 mm outside diameter and 32 mm width. Two fields make up the code — QJ2 is the four-point dimension series (medium-duty QJ200 four-point family) and the last two digits 19 give the bore by the standard code table (95 mm); there is no suffix — the split inner ring and 35 deg contact angle are inherent to the QJ design. The radial section height here is 37.5 mm, and the catalogue couples that with C 186 kN / C0 335 kN. Selection starts from the thrust share: as axial load grows past roughly half the radial load, an angular-contact position of this section usually outlives a deep-groove one. Mount with the thrust against the marked face: the contact angle runs from the low shoulder of the inner ring to the high shoulder of the outer ring, and reversing it throws the capacity away.
Typical equipment & failure modes
Common applications
- rolling-mill and metalworking drive shafts
- large pump, fan and compressor rotor shafts
- crane and hoist gearbox shafts
- paper-machine roll and calendar drives
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
- lubricant starvation scoring at the ball/raceway contact when grease volume or relubrication interval is guessed instead of calculated
- 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 95 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.
- 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 3,000 r/min speed figure assumes the catalogue lubrication state and a correctly set pair; real limits drop fast with excess grease fill or heavy preload.
- 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.
- The 186/335 kN ratings and 12.4 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for QJ219; 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 QJ219?
QJ219 is a four-point contact ball bearing to ISO 15: 95 mm bore, 170 mm outside diameter, 32 mm width (3.74 x 6.693 x 1.26 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 186 kN, C0 335 kN and a 12.4 kN fatigue load limit Pu; the grease limiting speed is 3,000 r/min and the oil rating 3,900 r/min; mass about 3350 g.
How is the QJ219 designation structured?
QJ2 is the four-point dimension series (medium-duty QJ200 four-point family); the last two digits 19 give the bore by the standard code table (95 mm); there is no suffix — the split inner ring and 35 deg contact angle are inherent to the QJ design. The 170 mm OD and 32 mm width follow the ISO 15 boundary-dimension plan for that series.
Which axial direction does QJ219 support?
QJ219 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 QJ219?
Per NTN Ball and Roller Bearings CAT.No.2203E, the grease limiting speed is 3,000 r/min and the oil rating 3,900 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 QJ219?
The 95/170/32 mm envelope is ISO 15 interchangeable, but internal geometry — contact angle, osculation, cage and shoulder details — is maker-specific. Re-verify C 186 kN / C0 335 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.