594A-592A bearing: complete specifications & equivalents
The 594A-592A is a ISO 355 radial bearing sized 95.25 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 | 95.25 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 | 2550 g |
| Manufacturer designation | SKF 594 A/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 | 3.75 in |
|---|---|
| Outer diameter D | 6 in |
| Width B | 1.563 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 28.6 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) | 2 of 2 |
| Bore above smallest 595-series size | 3.174999999999997 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 594A-592XE | 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. |
| 594A-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 594A-592A model number is decoded
Fit selection follows the rotating ring — interference on a rotating cone — and two 594A units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair. Journal and housing interface: the 95.25 mm bore takes a k5 shaft seat (upper deviation ~0.191 mm for this diameter range) and the 152.4 mm outside diameter pairs with an H7 housing bore tolerance band of 152.4.000/152.420 mm; the 39.688 mm width defines the shoulder depth, and the 2550 g cone-plus-cup assembly is the dead load on the shaft during thermal expansion calculations. Why the cup reference matters here: in the 595-series tables the 594 A cone appears against several cup options. 594A is the pairing with 592 A, and that choice — not the cone — fixes the 152.4 mm OD, the raceway track position and the 39.688 mm assembled width.The SKF 594 A/592 A is a 95.25×152.4×39.688 mm single-row tapered roller bearing — an inch-series entry with an asymmetric raceway cut for thrust capacity and separable mounting.The 595-series series assigns 95.25 mm bore, 152.4 mm OD and 39.688 mm width to 594A; 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. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Catalogue mass 2550 g for the 95.25×152.4×39.688 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
- roller large-end smearing against the cone rib after EP lubricant film failure
- false brinelling on idle paired sets exposed to machine vibration
- pressed-steel cage wear or fracture after prolonged running above the limiting speed
- mounting score marks when the cone is cocked over the shaft keyway or a burr
Selection pitfalls — read before you substitute
- Mount the 95.25 mm bore 594A 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 95.25 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.
- Do not mix brands or executions inside one 594A 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.
- Setting is a design value, not an assembly feel: excessive preload in the 594A pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.
- 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 152.4 mm cup race release as noise within the first running hours.
- 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 594A (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 594 A/592 A designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
How does 594A 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 594A position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting.
What shaft and housing fits suit 594A?
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 594A 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 594A?
The SKF 594 A/592 A is a single-row tapered roller bearing with 95.25 mm bore, 152.4 mm outer diameter and 39.688 mm width (3.75 × 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 2550 g. It is an open, separable bearing with a pressed-steel cage.
How does the 594A 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 95.25×152.4×39.688 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.