618-500-MA bearing: complete specifications & equivalents
The 618-500-MA is a ISO 15 radial bearing sized 500 x 620 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 | 500 mm |
| Outer diameter D | 620 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 | 620 kN |
| Fatigue load limit Pu | 11.2 kN |
| Reference speed (thermal) | 1800 rpm |
| Limiting speed (mechanical) | 1500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 40500 g |
| Manufacturer designation | 618/500 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 | 19.685 in |
|---|---|
| Outer diameter D | 24.409 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) | 57 of 74 |
| Bore above smallest 61800-series size | 499 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 618-500-MA model number is decoded
In the large-bore 61800-series, the bore is written directly after the slash as 500 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 500×620×56 mm (19.685×24.409×2.205 in) with a 60.0 mm radial section height, C 332 kN, C0 620 kN and Pu 11.2 kN. The open 618/500 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 1500 r/min, catalogue mass 40500 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.
Typical equipment & failure modes
Common applications
- large industrial gearboxes
- heavy conveyor drives
- hoists and winches
- industrial fans and blowers
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
- Catalogue ratings for 618-500-MA (C 332 kN, C0 620 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 618-500-MA home through the outer ring or balls brinells the raceways.
- The MA suffix on 618-500-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 40500 g quoted mass includes the heavier cage.
- Open 618-500-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 618-500-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.
- Mount by heating the inner ring (max 120 °C) — driving 618-500-MA home through the outer ring or balls brinells the raceways.
Frequently asked questions
What are the dimensions of 618-500-MA?
The SKF 618/500 MA measures 500 mm bore × 620 mm OD × 56 mm width (19.685 × 24.409 × 2.205 in), mass about 40500 g. It is open, with no shields or seals.
Why is there a slash in the designation 618/500 MA?
The slash writes a bore that falls outside the two-digit code table: 618/500 means 500 mm bore. The site slug 618-500-MA replaces the slash with a hyphen.
Which fits should I use for 618-500-MA?
With a rotating inner ring use roughly m6 on the shaft and H7 in the 620 mm housing; reverse the interference if the outer ring rotates.
How heavy is 618-500-MA?
Catalogue mass is 40500 g for 618/500 MA; seal and cage executions of the same envelope differ by a few grams.
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.