42690-42620 bearing: complete specifications & equivalents
The 42690-42620 is a ISO 355 radial bearing sized 77.788 x 127 x 30.163 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 77.788 mm |
| Outer diameter D | 127 mm |
| Width B | 30.163 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 171 kN |
| Basic static load rating C0 | 204 kN |
| Fatigue load limit Pu | 24 kN |
| Reference speed (thermal) | 4000 rpm |
| Limiting speed (mechanical) | 5000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1400 g |
| Manufacturer designation | SKF 42690/42620 |
| 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 & 42600-series range
| Bore d | 3.063 in |
|---|---|
| Outer diameter D | 5 in |
| Width B | 1.188 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 24.6 mm |
| Smallest bore in 42600-series | 76.2 mm |
| Largest outer diameter in 42600-series | 127 mm |
| Width range across 42600-series | 30.162–30.163 mm |
| Bore position in 42600-series (smallest first) | 2 of 2 |
| Bore above smallest 42600-series size | 1.5879999999999939 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 42690-42620-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 77.788×127×30.163 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| 42690-42620 | 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 42690-42620 model number is decoded
Two catalogue entries share the 42690 cone but use different cups; this one, 42690, takes the 42620 cup and is ground for the resulting 127 mm OD / 30.163 mm width envelope. Selecting a sibling cup produces a different boundary plan and a different order number, so the full designation is required at purchase.SKF 42690/42620 belongs to the SKF single-row tapered roller range — the 77.788 mm bore entry in the inch 42600-series, dimensioned 127 mm OD and 30.163 mm wide.The 42600-series series assigns 77.788 mm bore, 127 mm OD and 30.163 mm width to 42690; 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 42690 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. At 4,000 r/min reference speed the 24.6 mm-section 42690 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 5,000 r/min as the mechanical ceiling. Fit selection follows the rotating ring — interference on a rotating cone — and two 42690 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair. Dimensional interchange map: within the 42600 series at 77.788 mm bore, the 127 mm OD and 30.163 mm width are fixed by the ISO 355 plan, so any same-code bearing from another brand shares the mounting envelope; the 24.6 mm section height distinguishes this family from a 302 or 322 of the same bore, and the 1400 g mass is the minimum—sealed or snap-ring executions add rotating weight above that catalogue baseline.
Typical equipment & failure modes
Common applications
- heavy industrial gearboxes and speed reducers
- large process pump and compressor shafts
- rolling-mill auxiliary drives
- construction machinery 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
- thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting
- 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
- edge loading from shaft deflection or housing misalignment
Selection pitfalls — read before you substitute
- Mount the 77.788 mm bore 42690 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.
- The 42600-series inch series at 77.788 mm bore (127×30.163 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.
- O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 42690 mounting error.
- A single 42690 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.
- 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 127 mm cup race release as noise within the first running hours.
- The 171/204 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 42690 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 42690/42620 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
Is 42690 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 42690?
The SKF 42690/42620 is a single-row tapered roller bearing with 77.788 mm bore, 127 mm outer diameter and 30.163 mm width (3.063 × 5 × 1.188 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 171 kN, C0 204 kN, fatigue load limit Pu 24 kN, reference speed 4,000 r/min, limiting speed 5,000 r/min, mass about 1400 g. It is an open, separable bearing with a pressed-steel cage.
How does the 42690 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 42600-series code marks the dimensional series. The metric dimensions 77.788×127×30.163 mm are the converted equivalents of the original inch boundary dimensions.
What do the cone and cup numbers in 42690 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 (42600-series) groups sizes that share the same boundary-dimension plan.
Can a single 42690 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.
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.