NKI35-30-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 NKI35-30-XL model number is decoded

envelope 35×50×30 mm: 35 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 44 kN and C0 79 kN at the 35 mm seat; the C/C0 ratio of 0.56 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 50 mm outside diameter the fatigue load limit Cur is 14.9 kN, the limiting speed 11,400 r/min and the thermal reference speed 6,200 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 1.26 kN/mm and per millimetre of width 1.47 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 193 g, just 0.13 g per mm² of projected 50×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 35 mm bore places this bearing in the medium band, where the 50 mm envelope already carries ratings in the tens of kilonewtons Reading the NKI prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 44 kN C The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 79 kN C0 rating still assumes full rigid support under both rings 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 35×50×30 mm envelope. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 50 mm outside diameter and 44 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 35 mm seat, and in agricultural machine pivots and linkages the 193 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for connecting-rod small ends, relying on the 30 mm width and the published 79 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. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.

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.
• Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.
• On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.