618-530-MA bearing: complete specifications & equivalents
The 618-530-MA is a ISO 15 radial bearing sized 530 x 650 x 56 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 530 mm |
| Outer diameter D | 650 mm |
| Width B | 56 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 332 kN |
| Basic static load rating C0 | 655 kN |
| Fatigue load limit Pu | 11.2 kN |
| Reference speed (thermal) | 1700 rpm |
| Limiting speed (mechanical) | 1400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 39500 g |
| Manufacturer designation | 618/530 MA |
| 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 & 61800-series range
| Bore d | 20.866 in |
|---|---|
| Outer diameter D | 25.591 in |
| Width B | 2.205 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 60 mm |
| Smallest bore in 61800-series | 1 mm |
| Largest outer diameter in 61800-series | 1820 mm |
| Width range across 61800-series | 1–140 mm |
| Bore position in 61800-series (smallest first) | 58 of 74 |
| Bore above smallest 61800-series size | 529 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 618-530-MA model number is decoded
In the large-bore 61800-series, the bore is written directly after the slash as 530 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 530×650×56 mm (20.866×25.591×2.205 in) with a 60.0 mm radial section height, C 332 kN, C0 655 kN and Pu 11.2 kN. The open 618/530 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1400 r/min, catalogue mass 39500 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.
Typical equipment & failure modes
Common applications
- industrial fans and blowers
- mill and kiln auxiliaries
- pulp and paper machinery
- marine deck machinery
Known failure patterns
- contamination wear when the open arrangement is used without external seals
- lubricant starvation where no regreasing interval is maintained
- cage damage from running beyond the limiting speed
- raceway smearing under marginal lubrication at start-up
Selection pitfalls — read before you substitute
- Fillet radii must clear the 618-530-MA chamfer so the 56 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
- At 530 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.
- The MA suffix on 618-530-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 39500 g quoted mass includes the heavier cage.
- Open 618-530-MA 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 618-530-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.
- The fatigue load limit is 11.2 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.
Frequently asked questions
What are the dimensions of 618-530-MA?
The SKF 618/530 MA measures 530 mm bore × 650 mm OD × 56 mm width (20.866 × 25.591 × 2.205 in), mass about 39500 g. It is open, with no shields or seals.
Why is there a slash in the designation 618/530 MA?
The slash writes a bore that falls outside the two-digit code table: 618/530 means 530 mm bore. The site slug 618-530-MA replaces the slash with a hyphen.
What load can 618-530-MA take?
Catalogue values for 618/530 MA: dynamic C 332 kN, static C0 655 kN, fatigue limit Pu 11.2 kN. Use C in life calculation and C0 for static checks at 530 mm bore.
What is the speed rating of 618-530-MA?
SKF lists a 1700 r/min thermal reference speed and a 1400 r/min mechanical limiting speed for 618/530 MA; real limits also depend on lubrication and fits.
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.