PWKRE72-2RS-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 PWKRE72-2RS-XL model number is decoded

envelope 24×72×80 mm: the 72 mm outside diameter is the track-running surface — a thick-walled outer ring over a 24 mm stud — and the 80 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 39 kN and C0 55 kN for the PWKRE sealed double-row full-complement stud-type track roller with eccentric locking collar; the C/C0 ratio of 0.71 reflects a rolling-element pack sized for heavy static track loading, and the 24.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 7.1 kN at 24 mm stud, equivalent to 1.63 kN of dynamic rating per millimetre — the limiting speed is 2,200 r/min and, as for HR1 track rollers, no thermal reference speed is published the 24 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.49 kN per millimetre of rolling-element complement within the 80 mm overall stud length mass is 1.05 kg (1050 g), or 0.18 g per mm² of the 72×80 mm track envelope — inertia that the drive must accelerate on every index of the cam at 24 mm stud shank this size balances the 72 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range Two cageless roller rows deliver C 39 kN and C0 55 kN, 1.63 kN of dynamic rating per millimetre of stud — the heaviest track-roller ratings in the HR1 range The 24 mm stud clamps into the machine frame with its nut and washer while the 72 mm thick-walled, crowned-profile outer ring runs on the cam; overall length is 80 mm The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 24×72×80 mm envelope. With 2RS seals the 1050 g roller is effectively sealed for life — no relubrication path is provided and none is needed over the design life. Typical applications include linear rail and profile track guidance, automatic assembly machine carriages and glass and ceramic line conveyors, where the 72 mm track diameter and 39 kN dynamic rating match the duty. In linear rail and profile track guidance the threaded stud bolts directly to the frame, and in automatic assembly machine carriages the 1.05 kg mass is part of the rotor inertia calculation. Designers also specify it for glass and ceramic line conveyors, relying on the 80 mm stud length and the published 55 kN static rating. The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket. On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.
• On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.
• Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.