SL183018 bearing: complete specifications & equivalents
The SL183018 is a ISO 15 radial bearing sized 90 x 140 x 37 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | FAG |
| Bore diameter d | 90 mm |
| Outer diameter D | 140 mm |
| Width B | 37 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | none |
| Basic dynamic load rating C | 205 kN |
| Basic static load rating C0 | 275 kN |
| Fatigue load limit Pu | 41 kN |
| Reference speed (thermal) | 2240 rpm |
| Limiting speed (mechanical) | 2850 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1970 g |
| Manufacturer designation | SL183018 |
| Standard | ISO 15 |
| Catalog version | HR1 2026-09-25 |
| Last verified | 2026-09-30 |
Source: catalog reference (HR1 2026-09-25) · extracted 2026-09-30
Parameters extracted from the official FAG Rolling Bearings catalogue (HR1 2026-09-25); FAG® is a trademark of Schaeffler Technologies AG & Co. KG, used here for identification only — mpnbase is not an authorized FAG/Schaeffler distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at schaeffler.com.
Dimensions in inches & sl1830-series range
| Bore d | 3.543 in |
|---|---|
| Outer diameter D | 5.512 in |
| Width B | 1.457 in |
| ISO bore code | 18 |
| Radial section height (D−d)/2 | 25 mm |
| Smallest bore in sl1830-series | 20 mm |
| Largest outer diameter in sl1830-series | 600 mm |
| Width range across sl1830-series | 16–148 mm |
| Bore position in sl1830-series (smallest first) | 15 of 36 |
| Bore above smallest sl1830-series size | 70 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| SL183018 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data. |
Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the SL183018 model number is decoded
envelope 90×140×37 mm with a 25.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 205 kN and C0 275 kN; with a C/C0 ratio of 0.75 the 37 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 41 kN, the limiting speed 2,850 r/min and the thermal reference speed 2,240 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.28 kN per millimetre of the 90 mm bore and 5.54 kN per millimetre of the 37 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 1.97 kg (1970 g) (0.38 g per mm² of the 140×37 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads with a 90 mm bore this is a heavy-industrial bearing: 1.97 kg of stiff ring and roller set, specified where rigidity matters more than speed The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 25.0 mm section height between the 90 mm bore and the 140 mm outside diameter In the 140 mm envelope the cageless pack raises C0 to 275 kN; the trade is the 2,850 r/min limiting speed, set by roller-to-roller sliding rather than by a cage Typical applications include marine and offshore winch arrangements, rope drums and winch drums and hydraulic pumps and radial piston pumps, where the 140 mm outside diameter and 205 kN dynamic rating match the duty. In marine and offshore winch arrangements the unit fits a compact 90 mm seat, and in rope drums and winch drums the 1.97 kg mass is part of the rotor inertia calculation. Designers also specify it for hydraulic pumps and radial piston pumps, relying on the 37 mm width and the published 275 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.
Typical equipment & failure modes
Common applications
- material handling conveyor pulleys
- rope drums and winch drums
- construction machinery slewing drives
- planetary gear bearing positions
Known failure patterns
- raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band
- rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity
- roller smearing from roller-to-roller sliding at speeds above the limiting value
- edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)
- brinelling of the raceways from static shock during mounting or transport of the heavy rotor
- lubricant starvation in the tightly packed roller set, especially in the double-row executions
- freting and creep on a loose ring seat under a rotating load
- contamination wear in open gearbox positions with damaged seals or breathers
- false brinelling from micro-movement while the shaft is stationary under vibration
Selection pitfalls — read before you substitute
- Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.
- C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.
- The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.
Frequently asked questions
What are the dimensions of the SL183018?
The SL183018 is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 140 mm outside diameter, 90 mm bore and 37 mm width, envelope 90×140×37 mm. Mass is 1.97 kg.
What does the SL183018 designation mean in the FAG/INA HR1 catalogue?
SL183018 identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 90×140×37 mm and the catalogue ratings are C 205 kN, C0 275 kN, Cur 41 kN.
What is the load capacity of the SL183018?
The basic dynamic load rating C is 205 kN and the basic static load rating C0 is 275 kN; the fatigue load limit Cur is 41 kN.
What is the maximum speed of the SL183018?
The limiting speed is 2,850 r/min and the thermal reference speed is 2,240 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application.
What is the locating function of the SL183018?
This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion.
Reviewed & verified by the MPN Base engineering desk against source catalog HR1 2026-09-25 on 2026-09-30. Read our editorial & correction policy.