39590-39528 bearing: complete specifications & equivalents
The 39590-39528 is a ISO 355 radial bearing sized 65.088 x 119.985 x 32.751 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 65.088 mm |
| Outer diameter D | 119.985 mm |
| Width B | 32.751 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 175 kN |
| Basic static load rating C0 | 204 kN |
| Fatigue load limit Pu | 23.6 kN |
| Reference speed (thermal) | 4500 rpm |
| Limiting speed (mechanical) | 5600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1550 g |
| Manufacturer designation | SKF 39590/39528 |
| 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 & 39500-series range
| Bore d | 2.563 in |
|---|---|
| Outer diameter D | 4.724 in |
| Width B | 1.289 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 27.4 mm |
| Smallest bore in 39500-series | 53.975 mm |
| Largest outer diameter in 39500-series | 119.985 mm |
| Width range across 39500-series | 30.162–32.751 mm |
| Bore position in 39500-series (smallest first) | 3 of 3 |
| Bore above smallest 39500-series size | 11.112999999999992 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 39590-39520-NTN | NTN | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue. |
| 39590-39528 | 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 39590-39528 model number is decoded
Digit by digit, 39590 reads as cone reference / cup reference in the 39500-series inch series; the 65.088 mm bore, 119.985 mm OD and 32.751 mm width are the metric equivalents of the original inch boundary values. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. The 23.6 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.17 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. Note the minimum-axial-load requirement: at light radial load and high speed the rollers of 39590 must still be held into the rib contact, which is another reason the catalogue recommends paired mounting with controlled setting. Cross-section geometry: the 27.4 mm half-section ((119.985−65.088)/2) of this 39500-series unit places the roller large-end pitch diameter at roughly 92 mm, and the 32.751 mm axial width is split between cone (18 mm) and cup rib (15 mm) — a geometry that sets the contact angle and, with the 1550 g rotating cone mass, the critical speed at which cage-roller imbalance begins. A single-row inch tapered bearing is quoted as a cone/cup pair because the boundary dimensions belong to the combination, not to either half alone: in 39590 the 39590 cone contributes the 65.088 mm bore and roller set, the 39528 cup contributes the 119.985 mm OD raceway, and the assembled 32.751 mm width is the catalogue value.In SKF catalogue PUB BU/P1 17000, 39590 appears as SKF 39590/39528: an open, single-row tapered roller bearing in the 39500-series, supplied with a pressed-steel cage as standard.
Typical equipment & failure modes
Common applications
- paper-machine and printing rolls
- construction machinery drives
- marine deck machinery shafts
- marine deck machinery 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
- false brinelling on idle paired sets exposed to machine vibration
- preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways
- pressed-steel cage wear or fracture after prolonged running above the limiting speed
- brinelling from pressing the cone or cup home through the rollers
Selection pitfalls — read before you substitute
- Mount the 65.088 mm bore 39590 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 320 series at 65.088 mm bore (119.985×32.751 mm) is the low-friction, higher-speed section; it carries less thrust than a 302 of the same bore, so verify the axial load share before swapping.
- Do not mix brands or executions inside one 39590 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.
- 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 39590 mounting error.
- Catalogue reference speed and limiting speed are different limits: the 4,500 r/min reference is a thermal criterion under load, while the 5,600 r/min limiting value is the mechanical ceiling — observe both.
- The 175/204 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 39590 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 39590/39528 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
How does the 39590 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 39500-series code marks the dimensional series. The metric dimensions 65.088×119.985×32.751 mm are the converted equivalents of the original inch boundary dimensions.
What do the cone and cup numbers in 39590 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 (39500-series) groups sizes that share the same boundary-dimension plan.
Can a single 39590 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 39590 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 39590 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting.
What shaft and housing fits suit 39590?
For a rotating shaft under normal load, seat the cone on a k5 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 32.751 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.