NUKR90 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 NUKR90 model number is decoded

envelope 30×90×100 mm: the 90 mm outside diameter is the track-running surface — a thick-walled outer ring over a 30 mm stud — and the 100 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 79 kN and C0 126 kN for the NUKR double-row full-complement stud-type track roller; the C/C0 ratio of 0.63 reflects a rolling-element pack sized for heavy static track loading, and the 30.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 17 kN at 30 mm stud, equivalent to 2.63 kN of dynamic rating per millimetre — the limiting speed is 1,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 30 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.79 kN per millimetre of rolling-element complement within the 100 mm overall stud length mass is 1.96 kg (1960 g), or 0.22 g per mm² of the 90×100 mm track envelope — inertia that the drive must accelerate on every index of the cam the 30 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Reading the designation: no eccentric collar is fitted — the roller centre is fixed by the stud axis, with labyrinth-style protection at the faces Typical applications include robotic arm linear axes, agricultural and textile cam followers and conveyor transfer and diverting stations, where the 90 mm track diameter and 79 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 1.96 kg mass is part of the rotor inertia calculation. Designers also specify it for conveyor transfer and diverting stations, relying on the 100 mm stud length and the published 126 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. The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.

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.
• The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.
• Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 100 mm stud unusable.