618-1120-MA bearing: complete specifications & equivalents
The 618-1120-MA is a ISO 15 radial bearing sized 1120 x 1360 x 106 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 1120 mm |
| Outer diameter D | 1360 mm |
| Width B | 106 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 741 kN |
| Basic static load rating C0 | 2200 kN |
| Fatigue load limit Pu | 26.5 kN |
| Reference speed (thermal) | 630 rpm |
| Limiting speed (mechanical) | 530 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 315000 g |
| Manufacturer designation | 618/1120 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 | 44.094 in |
|---|---|
| Outer diameter D | 53.543 in |
| Width B | 4.173 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 120 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) | 71 of 74 |
| Bore above smallest 61800-series size | 1119 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 618-1120-MA model number is decoded
In the large-bore 61800-series, the bore is written directly after the slash as 1120 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 1120×1360×106 mm (44.094×53.543×4.173 in) with a 120.0 mm radial section height, C 741 kN, C0 2200 kN and Pu 26.5 kN. The open 618/1120 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 530 r/min, catalogue mass 315000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.
Typical equipment & failure modes
Common applications
- heavy conveyor drives
- hoists and winches
- industrial fans and blowers
- mill and kiln auxiliaries
Known failure patterns
- contamination wear when the open arrangement is used without external seals
- lubricant starvation where no regreasing interval is maintained
- false brinelling from vibration while the shaft stands idle
- fretting corrosion on a creeping shaft or housing seat
Selection pitfalls — read before you substitute
- Do not preload 618-1120-MA to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.
- Assign interference to the rotating ring: on a conventional shaft-mounted 1120 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.
- The MA suffix on 618-1120-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 315000 g quoted mass includes the heavier cage.
- Open 618-1120-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 618-1120-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.
- Fillet radii must clear the 618-1120-MA chamfer so the 106 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
Frequently asked questions
What are the dimensions of 618-1120-MA?
The SKF 618/1120 MA measures 1120 mm bore × 1360 mm OD × 106 mm width (44.094 × 53.543 × 4.173 in), mass about 315000 g. It is open, with no shields or seals.
Why is there a slash in the designation 618/1120 MA?
The slash writes a bore that falls outside the two-digit code table: 618/1120 means 1120 mm bore. The site slug 618-1120-MA replaces the slash with a hyphen.
Which fits should I use for 618-1120-MA?
With a rotating inner ring use roughly m6 on the shaft and H7 in the 1360 mm housing; reverse the interference if the outer ring rotates.
How heavy is 618-1120-MA?
Catalogue mass is 315000 g for 618/1120 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.