QJ313 bearing: complete specifications & equivalents
The QJ313 is a ISO 15 radial bearing sized 65 x 140 x 33 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 65 mm |
| Outer diameter D | 140 mm |
| Width B | 33 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 153 kN |
| Basic static load rating C0 | 228 kN |
| Fatigue load limit Pu | 9.7 kN |
| Limiting speed (mechanical) | 3900 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2700 g |
| Manufacturer designation | NTN QJ313 |
| 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 | 2.559 in |
|---|---|
| Outer diameter D | 5.512 in |
| Width B | 1.299 in |
| ISO bore code | 13 |
| Radial section height (D−d)/2 | 37.5 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) | 11 of 28 |
| Bore above smallest QJ300-series size | 48 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| QJ313 | 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 QJ313 model number is decoded
At 65 x 140 x 33 mm, NTN QJ313 sits in the heavy-duty QJ300 four-point family of the angular-contact programme. The designation breaks down as QJ3 is the four-point dimension series (heavy-duty QJ300 four-point family); the last two digits 13 give the bore by the standard code table (65 mm); there is no suffix — the split inner ring and 35 deg contact angle are inherent to the QJ design. NTN prints 153 kN dynamic and 228 kN static for this size and a 9.7 kN fatigue load limit Pu. Choose the heavy-duty QJ300 four-point family when the shaft needs a stiff locating support and the axial component is known to act mostly one way. Grease quantity matters as much as grade at 3,900 r/min: fill about a third of the free space and let the bearing purge on first run.
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
- 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
- pressed-steel cage pocket wear and rivet loosening after repeated ball skid at light load and high speed
- edge loading and early spalling from housing bores that are out of round or shoulders that are too small for the ring face
- lubricant starvation scoring at the ball/raceway contact when grease volume or relubrication interval is guessed instead of calculated
Selection pitfalls — read before you substitute
- Bearings of 65 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 QJ313 mounted the wrong way round still turns smoothly by hand; the failure shows up weeks later as raceway flaking on the unloaded-looking side.
- The C0 of 228 kN is a static rating, not a permissible running thrust — sizing continuous axial load from C0 alone is a recurring drawing-office error.
- Never use a four-point or double-row bearing as a like-for-like swap for a single QJ313 without re-checking axial float, heat and housing width — the kinematics differ.
- The 153/228 kN ratings and 9.7 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for QJ313; 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 QJ313?
QJ313 is a four-point contact ball bearing to ISO 15: 65 mm bore, 140 mm outside diameter, 33 mm width (2.559 x 5.512 x 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 153 kN, C0 228 kN and a 9.7 kN fatigue load limit Pu; the grease limiting speed is 3,900 r/min and the oil rating 5,200 r/min; mass about 2700 g.
How is the QJ313 designation structured?
QJ3 is the four-point dimension series (heavy-duty QJ300 four-point family); the last two digits 13 give the bore by the standard code table (65 mm); there is no suffix — the split inner ring and 35 deg contact angle are inherent to the QJ design. The 140 mm OD and 33 mm width follow the ISO 15 boundary-dimension plan for that series.
Which axial direction does QJ313 support?
QJ313 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 QJ313?
Per NTN Ball and Roller Bearings CAT.No.2203E, the grease limiting speed is 3,900 r/min and the oil rating 5,200 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 QJ313?
The 65/140/33 mm envelope is ISO 15 interchangeable, but internal geometry — contact angle, osculation, cage and shoulder details — is maker-specific. Re-verify C 153 kN / C0 228 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.