SL185068-TB 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 SL185068-TB model number is decoded

envelope 340×520×243 mm with a 90.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 4250 kN and C0 8300 kN; with a C/C0 ratio of 0.51 the 243 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 810 kN, the limiting speed 710 r/min and the thermal reference speed 335 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 12.50 kN per millimetre of the 340 mm bore and 17.49 kN per millimetre of the 243 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 178 kg (178000 g) (1.41 g per mm² of the 520×243 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 340 mm bore this is among the largest catalogue sizes; the 710 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position Full-complement kinematics cap the speed at 710 r/min (reference 335 r/min); below that limit the double-row pack offers exceptional stiffness for its section 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 The -TB feature concerns the rib contact, not the envelope: the 340×520×243 mm dimensions and 178 kg mass follow the standard series plan. Typical applications include material handling conveyor pulleys, rolling-mill and steel-industry drives and construction machinery slewing drives, where the 520 mm outside diameter and 4250 kN dynamic rating match the duty. In material handling conveyor pulleys the unit fits a compact 340 mm seat, and in rolling-mill and steel-industry drives the 178 kg mass is part of the rotor inertia calculation. Designers also specify it for construction machinery slewing drives, relying on the 243 mm width and the published 8300 kN static rating. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.
• Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.
• The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.