598-592A bearing: complete specifications & equivalents
The 598-592A is a ISO 355 radial bearing sized 92.075 x 152.4 x 39.688 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 92.075 mm |
| Outer diameter D | 152.4 mm |
| Width B | 39.688 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 237 kN |
| Basic static load rating C0 | 305 kN |
| Fatigue load limit Pu | 33.5 kN |
| Reference speed (thermal) | 3400 rpm |
| Limiting speed (mechanical) | 4300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2700 g |
| Manufacturer designation | SKF 598/592 A |
| 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 & 595-series range
| Bore d | 3.625 in |
|---|---|
| Outer diameter D | 6 in |
| Width B | 1.563 in |
| ISO bore code | 98 |
| Radial section height (D−d)/2 | 30.2 mm |
| Smallest bore in 595-series | 92.075 mm |
| Largest outer diameter in 595-series | 152.4 mm |
| Width range across 595-series | 39.688–39.688 mm |
| Bore position in 595-series (smallest first) | 1 of 2 |
| Bore above smallest 595-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 598-592A | 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 598-592A model number is decoded
Fit selection follows the rotating ring — interference on a rotating cone — and two 598 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair. Speed envelope and thermal behaviour: at 3,400 r/min thermal reference, the 92.075 mm bore shaft runs at a dn of 313k, and the 30.2 mm section dissipates heat through the cup-to-housing contact path; the 4,300 r/min mechanical ceiling reflects cage strength, and the 2700 g spinning cone contributes gyroscopic moment under rapid speed reversal. Cone-and-cup identity in 598: the leading 598 reference identifies the inner ring, rollers and cage; the trailing 592 A reference identifies the outer ring. The 595-series series lists alternative cups for the same cone, each producing a different 152.4 mm OD or 39.688 mm width — hence a different SKU even though the bore stays at 92.075 mm.SKF 598 (SKF 598/592 A) is the 595-series tapered roller choice for a 92.075 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 152.4×39.688 mm envelope.The code breaks down as cone/cup: the numbers before and after the slash identify the inner and outer ring sets, and the series prefix (595-series) ties the pair to a specific boundary plan. Dimensions 92.075×152.4×39.688 mm are the converted metric envelope. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. ); it is the dimensional series, not a separate part number. Catalogue mass 2700 g for the 92.075×152.4×39.688 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.
Typical equipment & failure modes
Common applications
- heavy industrial gearboxes and speed reducers
- large process pump and compressor shafts
- rolling-mill auxiliary drives
- large process pump and compressor 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
- thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting
- roller large-end smearing against the cone rib after EP lubricant film failure
- pressed-steel cage wear or fracture after prolonged running above the limiting speed
- electrical pitting on VFD-driven shafts without grounding protection
Selection pitfalls — read before you substitute
- Mount the 92.075 mm bore 598 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 595-series inch series at 92.075 mm bore (152.4×39.688 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.
- When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 598 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.
- At the 237 kN rating of 598, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 4,300 r/min speed end and heavier preload only where moment stiffness dominates.
- The 598 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.
- The 237/305 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 598 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 598/592 A designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
How does 598 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 598 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting.
What shaft and housing fits suit 598?
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 39.688 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 598 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 598?
The SKF 598/592 A is a single-row tapered roller bearing with 92.075 mm bore, 152.4 mm outer diameter and 39.688 mm width (3.625 × 6 × 1.563 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 237 kN, C0 305 kN, fatigue load limit Pu 33.5 kN, reference speed 3,400 r/min, limiting speed 4,300 r/min, mass about 2700 g. It is an open, separable bearing with a pressed-steel cage.
How does the 598 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 595-series code marks the dimensional series. The metric dimensions 92.075×152.4×39.688 mm are the converted equivalents of the original inch boundary dimensions.
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.