618-1000-MA bearing: complete specifications & equivalents
The 618-1000-MA is a ISO 15 radial bearing sized 1000 x 1220 x 100 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 1000 mm |
| Outer diameter D | 1220 mm |
| Width B | 100 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 637 kN |
| Basic static load rating C0 | 1800 kN |
| Fatigue load limit Pu | 22.8 kN |
| Reference speed (thermal) | 750 rpm |
| Limiting speed (mechanical) | 600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 245000 g |
| Manufacturer designation | 618/1000 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 | 39.37 in |
|---|---|
| Outer diameter D | 48.031 in |
| Width B | 3.937 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 110 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) | 69 of 74 |
| Bore above smallest 61800-series size | 999 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 618-1000-MA model number is decoded
In the large-bore 61800-series, the bore is written directly after the slash as 1000 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 1000×1220×100 mm (39.37×48.031×3.937 in) with a 110.0 mm radial section height, C 637 kN, C0 1800 kN and Pu 22.8 kN. The open 618/1000 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 600 r/min, catalogue mass 245000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.
Typical equipment & failure modes
Common applications
- hoists and winches
- industrial fans and blowers
- mill and kiln auxiliaries
- pulp and paper machinery
Known failure patterns
- contamination wear when the open arrangement is used without external seals
- lubricant starvation where no regreasing interval is maintained
- brinelling from static overload or hammer blows during mounting
- false brinelling from vibration while the shaft stands idle
Selection pitfalls — read before you substitute
- Catalogue ratings for 618-1000-MA (C 637 kN, C0 1800 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.
- Fillet radii must clear the 618-1000-MA chamfer so the 100 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
- The MA suffix on 618-1000-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 245000 g quoted mass includes the heavier cage.
- Open 618-1000-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 618-1000-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.
- Deep-groove geometry tolerates only minutes of misalignment; if the 1220 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 618-1000-MA.
Frequently asked questions
What are the dimensions of 618-1000-MA?
The SKF 618/1000 MA measures 1000 mm bore × 1220 mm OD × 100 mm width (39.37 × 48.031 × 3.937 in), mass about 245000 g. It is open, with no shields or seals.
Why is there a slash in the designation 618/1000 MA?
The slash writes a bore that falls outside the two-digit code table: 618/1000 means 1000 mm bore. The site slug 618-1000-MA replaces the slash with a hyphen.
What load can 618-1000-MA take?
Catalogue values for 618/1000 MA: dynamic C 637 kN, static C0 1800 kN, fatigue limit Pu 22.8 kN. Use C in life calculation and C0 for static checks at 1000 mm bore.
What is the speed rating of 618-1000-MA?
SKF lists a 750 r/min thermal reference speed and a 600 r/min mechanical limiting speed for 618/1000 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.