302-28 bearing: complete specifications & equivalents
The 302-28 is a ISO 355 radial bearing sized 28 x 58 x 17.25 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 28 mm |
| Outer diameter D | 58 mm |
| Width B | 17.25 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 46.6 kN |
| Basic static load rating C0 | 41.5 kN |
| Fatigue load limit Pu | 4.4 kN |
| Reference speed (thermal) | 10000 rpm |
| Limiting speed (mechanical) | 12000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 200 g |
| Manufacturer designation | SKF 302/28 |
| Standard | ISO 355 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB |
| Last verified | 2026-09-28 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric 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. 8.1 metric 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 & 30200-series range
| Bore d | 1.102 in |
|---|---|
| Outer diameter D | 2.283 in |
| Width B | 0.679 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 15 mm |
| Smallest bore in 30200-series | 15 mm |
| Largest outer diameter in 30200-series | 580 mm |
| Width range across 30200-series | 11.75–104 mm |
| Bore position in 30200-series (smallest first) | 5 of 37 |
| Bore above smallest 30200-series size | 13 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 302-28 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier. |
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 302-28 model number is decoded
For a 28 mm shaft carrying combined load, SKF lists 302 under catalogue execution SKF 302/28: one open single-row tapered roller bearing in the standard section of the 30200 family.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 02 is the ISO 355 diameter/width series (standard section), and the last two digits encode the 28 mm bore; the 58 mm OD and 17.25 mm width follow the ISO 355 general plan. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Selection arithmetic: the C0/C ratio is about 0.89 (static 41.5 kN against dynamic 46.6 kN), typical of a tapered roller sized for axial capacity, and the 4.4 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Fit selection follows the rotating ring — interference on a rotating cone — and two 302 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair. Material and manufacturing detail: the 200 g catalogue mass reflects through-hardened bearing steel (density ~7.85 g/cm³) machined to the 30200 ISO envelope, with the pressed-steel cage contributing roughly 6 g of the total; the 28 mm bore is ground to IT5 roundness and the 58 mm OD to IT5 cylindricity, and the 17.25 mm width tolerance keeps the pair-setting scatter within the ISO preload class.
Typical equipment & failure modes
Common applications
- automotive and light-truck wheel hubs
- industrial gearbox shafts and reducers
- differential and pinion drives
- 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
- false brinelling on idle paired sets exposed to machine vibration
- roller large-end smearing against the cone rib after EP lubricant film failure
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- mounting score marks when the cone is cocked over the shaft keyway or a burr
Selection pitfalls — read before you substitute
- On this 28 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 302 pair heats, loses setting control and smears the roller-rib contact.
- The 302 series at 28 mm bore (58×17.25 mm) is the standard tapered-roller envelope; stepping to a 32202 or 32302 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.
- At the 46.6 kN rating of 302, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 12,000 r/min speed end and heavier preload only where moment stiffness dominates.
- 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 302 mounting error.
- 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 58 mm cup race release as noise within the first running hours.
- The 46.6/41.5 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 302 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 302/28 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
What are the dimensions and catalogue data of 302?
The SKF 302/28 is a single-row tapered roller bearing with 28 mm bore, 58 mm outer diameter and 17.25 mm width (1.102 × 2.283 × 0.679 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 46.6 kN, C0 41.5 kN, fatigue load limit Pu 4.4 kN, reference speed 10,000 r/min, limiting speed 12,000 r/min, mass about 200 g. It is an open, separable bearing with a pressed-steel cage.
How does the 302 bore code work?
The last two digits of 302 are bore code 02, one of the small special codes: 00 = 10 mm, 01 = 12 mm, 02 = 15 mm, 03 = 17 mm — here 02 = 28 mm bore. The 58 mm OD and 17.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code.
What do the 302 series and basic execution designations mean?
The leading 3 marks a single-row tapered roller bearing; the second digit 02 is the ISO 355 series (standard section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution.
Can a single 302 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 302 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 302 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB on 2026-09-28. Read our editorial & correction policy.