67391-67322 bearing: complete specifications & equivalents
The 67391-67322 is a ISO 355 radial bearing sized 133.35 x 196.85 x 46.038 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 133.35 mm |
| Outer diameter D | 196.85 mm |
| Width B | 46.038 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 395 kN |
| Basic static load rating C0 | 585 kN |
| Fatigue load limit Pu | 60 kN |
| Reference speed (thermal) | 2400 rpm |
| Limiting speed (mechanical) | 3000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 4650 g |
| Manufacturer designation | SKF 67391/67322 |
| Standard | ISO 355 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch single-row TRB |
| Last verified | 2026-09-28 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch single-row TRB) · extracted 2026-09-28
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch single-row TRB); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.
Dimensions in inches & 67300-series range
| Bore d | 5.25 in |
|---|---|
| Outer diameter D | 7.75 in |
| Width B | 1.813 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 31.8 mm |
| Smallest bore in 67300-series | 127 mm |
| Largest outer diameter in 67300-series | 196.85 mm |
| Width range across 67300-series | 46.038–46.038 mm |
| Bore position in 67300-series (smallest first) | 2 of 2 |
| Bore above smallest 67300-series size | 6.349999999999994 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 67391-67322-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 133.35×196.85×46.038 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| 67391-67322 | Timken | full Dimensions and internal design equivalent — standard interchange. | Same inch-series cone/cup boundary envelope (d/D/T); load ratings and speed limits are brand-specific and may differ. |
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 67391-67322 model number is decoded
Speed planning uses two different ceilings: 2,400 r/min thermal reference and 3,000 r/min mechanical limiting speed. A single 67391 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel. Journal and housing interface: the 133.35 mm bore takes a m6 shaft seat (upper deviation ~0.267 mm for this diameter range) and the 196.85 mm outside diameter pairs with an H7 housing bore tolerance band of 196.85.000/196.870 mm; the 46.038 mm width defines the shoulder depth, and the 4650 g cone-plus-cup assembly is the dead load on the shaft during thermal expansion calculations. Cup-side note for 67322: the outer ring's rib profile and the 196.85 mm outside diameter are cup-specific within the 67300-series tables, so substituting a different cup against the same 67391 cone changes both the assembled 46.038 mm width and the axial free-play setting of the mounted pair.Ordering number SKF 67391/67322 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 133.35 mm shaft, inch series, with an open pressed-steel-cage execution and one-direction axial capacity.In SKF inch-series tables 67391 sits at 133.35 mm bore (5.25 in) with a 196.85 mm cup OD and 46.038 mm total width — dimensions that trace back to the original Timken boundary plan for the 67300-series family. In SKF suffix language a bare 67391 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately.
Typical equipment & failure modes
Common applications
- offshore winch and drawworks drums
- rolling-mill roll-neck bearings
- heavy-duty rolling-mill gearboxes
- large industrial mixer shafts
Known failure patterns
- cup or cone misalignment when the separable rings are not seated square during mounting
- loose cup rotation in the housing when the specified press fit is not achieved
- preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways
- uneven load sharing in a pair when spacer faces are not parallel to the bore
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- mounting score marks when the cone is cocked over the shaft keyway or a burr
Selection pitfalls — read before you substitute
- At 133.35 mm bore the cone mass is high enough that cocking during mounting damages the cage and rib; guide the ring square, confirm seat contact around the full circumference, and re-check setting after the first thermal cycle of the paired set.
- The 67300-series inch series at 133.35 mm bore (196.85×46.038 mm) follows the Timken cone/cup convention; substitutions must match both the cone and cup reference exactly — interchanging with another series or a metric 3xxxx bearing of the same bore changes OD, width and contact angle, so re-run the pair setting and shoulder-diameter checks before swapping.
- At the 395 kN rating of 67391, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 3,000 r/min speed end and heavier preload only where moment stiffness dominates.
- When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 67391 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.
- Catalogue reference speed and limiting speed are different limits: the 2,400 r/min reference is a thermal criterion under load, while the 3,000 r/min limiting value is the mechanical ceiling — observe both.
- The 395/585 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.
- SKF lists several executions of 67391 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 67391/67322 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
Can a single 67391 take axial load in both directions?
No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared.
How does 67391 compare with a ball bearing of the same bore?
A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 67391 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting.
What shaft and housing fits suit 67391?
For a rotating shaft under normal load, seat the cone on a m6 shaft fit; the cup is usually a loose-to-transition fit in the housing so it can creep slightly and distribute wear. Chamfer and shoulder diameters must clear the bearing rings so the 46.038 mm-wide cup seats square; the mounting setting (end play or preload) is set by the axial position of the cup relative to the cone.
Is 67391 interchangeable with other brands?
Inch-series tapered roller bearings follow a long-standing industry boundary plan, so cones and cups of the same basic number are generally dimensionally interchangeable across manufacturers. However, internal geometry, cage design and load ratings differ by brand, so for paired or precision applications keep both halves of the set from one manufacturer — or re-verify ratings and setting when mixing.
What are the dimensions and catalogue data of 67391?
The SKF 67391/67322 is a single-row tapered roller bearing with 133.35 mm bore, 196.85 mm outer diameter and 46.038 mm width (5.25 × 7.75 × 1.813 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 395 kN, C0 585 kN, fatigue load limit Pu 60 kN, reference speed 2,400 r/min, limiting speed 3,000 r/min, mass about 4650 g. It is an open, separable bearing with a pressed-steel cage.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch single-row TRB on 2026-09-28. Read our editorial & correction policy.