NUKR52 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 NUKR52 model number is decoded

envelope 20×52×66 mm: the 52 mm outside diameter is the track-running surface — a thick-walled outer ring over a 20 mm stud — and the 66 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 29.5 kN and C0 41.5 kN for the NUKR double-row full-complement stud-type track roller; the C/C0 ratio of 0.71 reflects a rolling-element pack sized for heavy static track loading, and the 16.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 5.4 kN at 20 mm stud, equivalent to 1.48 kN of dynamic rating per millimetre — the limiting speed is 4,200 r/min and, as for HR1 track rollers, no thermal reference speed is published the 20 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.45 kN per millimetre of rolling-element complement within the 66 mm overall stud length mass is 450 g, or 0.13 g per mm² of the 52×66 mm track envelope — inertia that the drive must accelerate on every index of the cam at 20 mm stud shank this size balances the 52 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range The stud is drilled for relubrication via the lubricating nipple in the head; the limiting speed is 4,200 r/min and no thermal reference speed is given for track rollers 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 Typical applications include robotic arm linear axes, agricultural and textile cam followers and conveyor transfer and diverting stations, where the 52 mm track diameter and 29.5 kN dynamic rating match the duty. In robotic arm linear axes the threaded stud bolts directly to the frame, and in agricultural and textile cam followers the 450 g mass keeps follower kinetics light. Designers also specify it for conveyor transfer and diverting stations, relying on the 66 mm stud length and the published 41.5 kN static rating. Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 66 mm stud unusable. Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 66 mm stud unusable.
• Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.
• On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.