63-28 bearing: complete specifications & equivalents
The 63-28 is a ISO 15 radial bearing sized 28 x 68 x 18 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 | 68 mm |
| Width B | 18 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 25.1 kN |
| Basic static load rating C0 | 13.7 kN |
| Fatigue load limit Pu | 0.585 kN |
| Reference speed (thermal) | 22000 rpm |
| Limiting speed (mechanical) | 14000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 300 g |
| Manufacturer designation | 63/28 |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018) |
| Last verified | 2026-09-27 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018)) · extracted 2026-09-27
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018)); 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 & 6300-series range
| Bore d | 1.102 in |
|---|---|
| Outer diameter D | 2.677 in |
| Width B | 0.709 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 20 mm |
| Smallest bore in 6300-series | 2 mm |
| Largest outer diameter in 6300-series | 500 mm |
| Width range across 6300-series | 3–95 mm |
| Bore position in 6300-series (smallest first) | 12 of 40 |
| Bore above smallest 6300-series size | 26 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 63-28 model number is decoded
In the large-bore 6300-series, the bore is written directly after the slash as 28 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 28×68×18 mm (1.102×2.677×0.709 in) with a 20.0 mm radial section height, C 25.1 kN, C0 13.7 kN and Pu 0.585 kN. The open 63/28 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 14000 r/min, catalogue mass 300 g.
Typical equipment & failure modes
Common applications
- garden machinery
- textile machines
- electric motors
- centrifugal pumps
Known failure patterns
- contamination wear when the open arrangement is used without external seals
- lubricant starvation where no regreasing interval is maintained
- raceway smearing under marginal lubrication at start-up
- electrical pitting in VFD-driven motors without shaft grounding
Selection pitfalls — read before you substitute
- Fillet radii must clear the 63-28 chamfer so the 18 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
- Mount by heating the inner ring (max 120 °C) — driving 63-28 home through the outer ring or balls brinells the raceways.
- Open 63-28 needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.
- Plan a relubrication interval for 63-28; run-to-failure on open deep-groove bearings is the dominant early-failure cause.
- Catalogue ratings for 63-28 (C 25.1 kN, C0 13.7 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.
- Mount by heating the inner ring (max 120 °C) — driving 63-28 home through the outer ring or balls brinells the raceways.
Frequently asked questions
What are the dimensions of 63-28?
The SKF 63/28 measures 28 mm bore × 68 mm OD × 18 mm width (1.102 × 2.677 × 0.709 in), mass about 300 g. It is open, with no shields or seals.
Why is there a slash in the designation 63/28?
The slash writes a bore that falls outside the two-digit code table: 63/28 means 28 mm bore. The site slug 63-28 replaces the slash with a hyphen.
What is the speed rating of 63-28?
SKF lists a 22000 r/min thermal reference speed and a 14000 r/min mechanical limiting speed for 63/28; real limits also depend on lubrication and fits.
What is the difference between 63-28 and a same-bore 62-series bearing?
Section height differs: 63-28 has a 20 mm radial section and C 25.1 kN; always match d, D and B — same bore alone never makes two bearings interchangeable.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018) on 2026-09-27. Read our editorial & correction policy.