NKI80-35-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 NKI80-35-XL model number is decoded

envelope 80×110×35 mm: 80 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 116 kN and C0 208 kN at the 80 mm seat; the C/C0 ratio of 0.56 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 110 mm outside diameter the fatigue load limit Cur is 38 kN, the limiting speed 5,100 r/min and the thermal reference speed 3,050 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.45 kN/mm and per millimetre of width 3.31 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 959 g, just 0.25 g per mm² of projected 110×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 80 mm bore the 110 mm outside diameter and 35 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 5,100 r/min Cur 38 kN, limiting speed 5,100 r/min, reference speed 3,050 r/min — the inner ring adds a few grams (total 959 g) but removes the hardening requirement This is the choice for OEM production on soft shafts: machine the 80 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 38 kN Cur value. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 110 mm outside diameter and 116 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 80 mm seat, and in textile machine heald and cam shafts the 959 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 35 mm width and the published 208 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.
• Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.
• Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.