67981-67919 bearing: complete specifications & equivalents
The 67981-67919 is a ISO 355 radial bearing sized 198.298 x 279.4 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 | 198.298 mm |
| Outer diameter D | 279.4 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 | 465 kN |
| Basic static load rating C0 | 830 kN |
| Fatigue load limit Pu | 76.5 kN |
| Reference speed (thermal) | 1600 rpm |
| Limiting speed (mechanical) | 2000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 9200 g |
| Manufacturer designation | SKF 67981/67919 |
| 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 & 67900-series range
| Bore d | 7.807 in |
|---|---|
| Outer diameter D | 11 in |
| Width B | 1.813 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 40.6 mm |
| Smallest bore in 67900-series | 198.298 mm |
| Largest outer diameter in 67900-series | 282.575 mm |
| Width range across 67900-series | 46.038–46.038 mm |
| Bore position in 67900-series (smallest first) | 1 of 4 |
| Bore above smallest 67900-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 67981-67919 | 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 67981-67919 model number is decoded
The 67900-series series assigns 198.298 mm bore, 279.4 mm OD and 46.038 mm width to 67981; the cone and cup references are not interchangeable with other inch-series pairs even when the bore matches, because the cup profile and rib geometry are series-specific. In SKF suffix language a bare 67981 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. Selection arithmetic: the C0/C ratio is about 1.78 (static 830 kN against dynamic 465 kN), typical of a tapered roller sized for axial capacity, and the 76.5 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 67981 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat. Operating context for the 198.298 mm bore: a shaft of this diameter in the xl-bore band typically runs between 158638 and 237958 r/min in real machinery, and the 279.4 mm outside diameter places the housing shoulder at 287 mm outer abutment; the 46.038 mm width and 9200 g mass together set the shaft critical speed and the housing resonance check for this 67900-series envelope. Cup-side note for 67919: the outer ring's rib profile and the 279.4 mm outside diameter are cup-specific within the 67900-series tables, so substituting a different cup against the same 67981 cone changes both the assembled 46.038 mm width and the axial free-play setting of the mounted pair.Ordering number SKF 67981/67919 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 198.298 mm shaft, inch series, with an open pressed-steel-cage execution and one-direction axial capacity.
Typical equipment & failure modes
Common applications
- rolling-mill roll-neck bearings
- heavy-duty rolling-mill gearboxes
- large crusher and mineral-processing drives
- large crusher and mineral-processing drives
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
- false brinelling on idle paired sets exposed to machine vibration
- axial overload spalling at the roller-rib contact beyond the single-row thrust rating
- pressed-steel cage wear or fracture after prolonged running above the limiting speed
- hard-particle indentation of the tapered raceway in unfiltered oil
Selection pitfalls — read before you substitute
- At 198.298 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 67900-series inch series at 198.298 mm bore (279.4×46.038 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.
- The tapered contact angle creates an induced axial load under pure radial force; include it in the 67981 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.
- Do not mix brands or executions inside one 67981 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.
- Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 279.4 mm cup race release as noise within the first running hours.
- The 465/830 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 67981 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 67981/67919 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
How does the 67981 inch-series designation work?
Inch-series tapered roller bearings use a Timken-style cone/cup convention: the number before the slash identifies the cone (inner ring with roller and cage assembly), the number after the slash identifies the cup (outer ring), and the 67900-series code marks the dimensional series. The metric dimensions 198.298×279.4×46.038 mm are the converted equivalents of the original inch boundary dimensions.
What do the cone and cup numbers in 67981 mean?
The cone number (before the slash) identifies the inner ring, rollers and cage; the cup number (after the slash) identifies the outer ring. Both are quoted together because a single-row tapered roller bearing is a matched separable pair — the cone and cup are ground to work together and are not interchangeable with arbitrary other parts. The series prefix (67900-series) groups sizes that share the same boundary-dimension plan.
Can a single 67981 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 67981 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 67981 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting.
What shaft and housing fits suit 67981?
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.
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.