SL183008-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 SL183008-XL model number is decoded

envelope 40×68×21 mm with a 14.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 66 kN and C0 67 kN; with a C/C0 ratio of 0.99 the 21 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 11.4 kN, the limiting speed 6,300 r/min and the thermal reference speed 4,350 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.65 kN per millimetre of the 40 mm bore and 3.14 kN per millimetre of the 21 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 310 g (0.22 g per mm² of the 68×21 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 40 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 21 mm width as a standard mounting space 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 66 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 As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 11.4 kN Cur value. Typical applications include planetary gear bearing positions, construction machinery slewing drives and compact slow-speed agitator drives, where the 68 mm outside diameter and 66 kN dynamic rating match the duty. In planetary gear bearing positions the unit fits a compact 40 mm seat, and in construction machinery slewing drives the 310 g mass suits the compact, space-optimised housing. Designers also specify it for compact slow-speed agitator drives, relying on the 21 mm width and the published 67 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.