PWKR40-2RS-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 PWKR40-2RS-XL model number is decoded

envelope 18×40×58 mm: the 40 mm outside diameter is the track-running surface — a thick-walled outer ring over a 18 mm stud — and the 58 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 14.3 kN and C0 18.2 kN for the PWKR sealed double-row full-complement stud-type track roller; the C/C0 ratio of 0.79 reflects a rolling-element pack sized for heavy static track loading, and the 11.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 2.2 kN at 18 mm stud, equivalent to 0.79 kN of dynamic rating per millimetre — the limiting speed is 5,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 18 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.25 kN per millimetre of rolling-element complement within the 58 mm overall stud length mass is 242 g, or 0.10 g per mm² of the 40×58 mm track envelope — inertia that the drive must accelerate on every index of the cam the 18 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Stud mounting puts all moment load into the bracket — torque the stud nut to the catalogue value, support the shank over its full length, and use the eccentric collar only for its small design adjustment range As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 2.2 kN Cur value. 2RS means two side contact seals: the sealed roller excludes contamination without a separate shield arrangement, at the published limiting speed of 5,000 r/min. Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 40 mm track diameter and 14.3 kN dynamic rating match the duty. In agricultural and textile cam followers the threaded stud bolts directly to the frame, and in packaging machine timing mechanisms the 242 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 58 mm stud length and the published 18.2 kN static rating. Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR. Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 58 mm stud unusable.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.
• Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 58 mm stud unusable.
• On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.