39580-39528 bearing: complete specifications & equivalents
The 39580-39528 is a ISO 355 radial bearing sized 53.975 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 | 53.975 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 | 1750 g |
| Manufacturer designation | SKF 39580/39528 |
| 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 | 2.125 in |
|---|---|
| Outer diameter D | 4.724 in |
| Width B | 1.289 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 33 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) | 1 of 3 |
| Bore above smallest 39500-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 39580-39520-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. |
| 39580-39528 | 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 39580-39528 model number is decoded
Numbering ties the bearing to its inch-series envelope: 39580 means a cone and cup matched pair in the 39500-series series — which is why the 53.975×119.985×32.751 mm outline swaps dimensionally with other inch-series bearings of the same code. In SKF suffix language a bare 39580 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. Catalogue mass 1750 g for the 53.975×119.985×32.751 mm open execution covers the pressed-steel cage and standard roller complement; sealed or special-clearance variants differ slightly in mass and carry their own order numbers. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 39580 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 53.975 mm bore: a shaft of this diameter in the medium-bore band typically runs between 43180 and 64770 r/min in real machinery, and the 119.985 mm outside diameter places the housing shoulder at 128 mm outer abutment; the 32.751 mm width and 1750 g mass together set the shaft critical speed and the housing resonance check for this 39500-series envelope. 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 39580 the 39580 cone contributes the 53.975 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.Ordering number SKF 39580/39528 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 53.975 mm shaft, inch series, with an open pressed-steel-cage execution and one-direction axial capacity.
Typical equipment & failure modes
Common applications
- pump and compressor shafts
- machine-tool spindles
- belt-driven fan and blower shafts
- belt-driven fan and blower 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
- thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting
- pressed-steel cage wear or fracture after prolonged running above the limiting speed
- fretting corrosion on a loose rotating shaft seat
Selection pitfalls — read before you substitute
- On this 53.975 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 39580 pair heats, loses setting control and smears the roller-rib contact.
- The 320 series at 53.975 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.
- At the 175 kN rating of 39580, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 5,600 r/min speed end and heavier preload only where moment stiffness dominates.
- Do not mix brands or executions inside one 39580 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 119.985 mm cup race release as noise within the first running hours.
- 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 39580 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 39580/39528 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
How does the 39580 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 53.975×119.985×32.751 mm are the converted equivalents of the original inch boundary dimensions.
What do the cone and cup numbers in 39580 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 39580 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 39580 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 39580 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting.
What shaft and housing fits suit 39580?
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.