SL183004-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 SL183004-XL model number is decoded

envelope 20×42×16 mm with a 11.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 30.5 kN and C0 26 kN; with a C/C0 ratio of 1.17 the 16 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 4.55 kN, the limiting speed 11,400 r/min and the thermal reference speed 7,500 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.52 kN per millimetre of the 20 mm bore and 1.91 kN per millimetre of the 16 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 110 g (0.16 g per mm² of the 42×16 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 20 mm bore this size balances the 42 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range Reading the designation: SL18 marks the Schaeffler full-complement semi-locating type with one rib on the outer ring and two ribs on the inner ring; the rollers are axially guided by the inner ring while the outer ring can displace by the catalogue s-value High radial rigidity at 30.5 kN C is the point of this design: rib-guided rollers in a cageless pack resist deflection in planetary gears, rope drums and vibrating machinery X-life status (-XL) indicates the current Schaeffler premium execution at 20 mm bore; the 26 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include marine and offshore winch arrangements, rope drums and winch drums and hydraulic pumps and radial piston pumps, where the 42 mm outside diameter and 30.5 kN dynamic rating match the duty. In marine and offshore winch arrangements the unit fits a compact 20 mm seat, and in rope drums and winch drums the 110 g mass suits the compact, space-optimised housing. Designers also specify it for hydraulic pumps and radial piston pumps, relying on the 16 mm width and the published 26 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. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.

Typical equipment & failure modes

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.
• The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.
• Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.