SL185004-XL bearing: complete specifications & equivalents

Specification table

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.

Cross references & equivalents

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 SL185004-XL model number is decoded

envelope 20×42×30 mm with a 11.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 53 kN and C0 52 kN; with a C/C0 ratio of 1.02 the 30 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 9.1 kN, the limiting speed 11,400 r/min and the thermal reference speed 7,400 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.65 kN per millimetre of the 20 mm bore and 1.77 kN per millimetre of the 30 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 200 g (0.16 g per mm² of the 42×30 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 20 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The SL1850 tolerates no angular misalignment — the two roller rows distribute load only when shaft and housing axes are parallel, so housing bore alignment is a mounting requirement Two cageless roller rows inside the 42×30 mm envelope give C 53 kN and C0 52 kN — among the highest radial capacities available at the 20 mm bore X-life status (-XL) indicates the current Schaeffler premium execution at 20 mm bore; the 52 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include heavy industrial gearbox shafts, crane travelling-wheel mechanisms and vibrating and oscillating machinery, where the 42 mm outside diameter and 53 kN dynamic rating match the duty. In heavy industrial gearbox shafts the unit fits a compact 20 mm seat, and in crane travelling-wheel mechanisms the 200 g mass suits the compact, space-optimised housing. Designers also specify it for vibrating and oscillating machinery, relying on the 30 mm width and the published 52 kN static rating. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling. 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

Selection pitfalls — read before you substitute

• The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.
• C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.
• 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.