NKI75-35-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 NKI75-35-XL model number is decoded

envelope 75×105×35 mm: 75 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 111 kN and C0 193 kN at the 75 mm seat; the C/C0 ratio of 0.58 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 105 mm outside diameter the fatigue load limit Cur is 35 kN, the limiting speed 5,400 r/min and the thermal reference speed 3,200 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 1.48 kN/mm and per millimetre of width 3.17 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 908 g, just 0.25 g per mm² of projected 105×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 75 mm bore this is a heavy-industrial bearing: 908 g of stiff ring and roller set, specified where rigidity matters more than speed Reading the NKI prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 111 kN C The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 5,400 r/min limit. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 105 mm outside diameter and 111 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 75 mm seat, and in copying and printing machine mechanisms the 908 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 35 mm width and the published 193 kN static rating. 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. 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

• 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.
• Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.
• Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.