QJ316 bearing: complete specifications & equivalents
The QJ316 is a ISO 15 radial bearing sized 80 x 170 x 39 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 80 mm |
| Outer diameter D | 170 mm |
| Width B | 39 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 202 kN |
| Basic static load rating C0 | 330 kN |
| Fatigue load limit Pu | 12.7 kN |
| Limiting speed (mechanical) | 3200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 4640 g |
| Manufacturer designation | NTN QJ316 |
| 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 & QJ300-series range
| Bore d | 3.15 in |
|---|---|
| Outer diameter D | 6.693 in |
| Width B | 1.535 in |
| ISO bore code | 16 |
| Radial section height (D−d)/2 | 45 mm |
| Smallest bore in QJ300-series | 17 mm |
| Largest outer diameter in QJ300-series | 400 mm |
| Width range across QJ300-series | 14–78 mm |
| Bore position in QJ300-series (smallest first) | 14 of 28 |
| Bore above smallest QJ300-series size | 63 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| QJ316 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier. |
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 QJ316 model number is decoded
QJ316 is an NTN four-point contact ball bearing: heavy-duty QJ300 four-point family, listed in NTN Ball and Roller Bearings CAT.No.2203E at 80 x 170 x 39 mm. Decoding QJ316: QJ3 is the four-point dimension series (heavy-duty QJ300 four-point family), with the last two digits 16 give the bore by the standard code table (80 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 45.0 mm, and the catalogue couples that with C 202 kN / C0 330 kN. For a 80 mm shaft with combined load, the practical shortlist is this series, its neighbouring dimension series, and — where thrust reverses — a back-to-back pair rather than a single row. After mounting, check axial float or preload with a dial gauge on the shaft end — the specification, not hand feel, decides whether the contact angle works as rated.
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
- pressed-steel cage pocket wear and rivet loosening after repeated ball skid at light load and high speed
- lubricant starvation scoring at the ball/raceway contact when grease volume or relubrication interval is guessed instead of calculated
- 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 80 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.
- Grease rated for deep-groove motor duty is not automatically right at 3,200 r/min with preload; check the grease speed factor against the catalogue figure.
- Do not pair two random QJ316 bearings from stock and expect catalogue paired ratings — matched-set grinding is what makes DB/DF/DT preload behave, and NTN sells those as separate order numbers.
- 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 202/330 kN ratings and 12.7 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for QJ316; 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 QJ316?
QJ316 is a four-point contact ball bearing to ISO 15: 80 mm bore, 170 mm outside diameter, 39 mm width (3.15 x 6.693 x 1.535 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 202 kN, C0 330 kN and a 12.7 kN fatigue load limit Pu; the grease limiting speed is 3,200 r/min and the oil rating 4,200 r/min; mass about 4640 g.
How is the QJ316 designation structured?
QJ3 is the four-point dimension series (heavy-duty QJ300 four-point family); the last two digits 16 give the bore by the standard code table (80 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 39 mm width follow the ISO 15 boundary-dimension plan for that series.
Which axial direction does QJ316 support?
QJ316 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 QJ316?
Per NTN Ball and Roller Bearings CAT.No.2203E, the grease limiting speed is 3,200 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 QJ316?
The 80/170/39 mm envelope is ISO 15 interchangeable, but internal geometry — contact angle, osculation, cage and shoulder details — is maker-specific. Re-verify C 202 kN / C0 330 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.