NKI85-26-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 NKI85-26-XL model number is decoded

envelope 85×115×26 mm: 85 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 83 kN and C0 137 kN at the 85 mm seat; the C/C0 ratio of 0.61 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 115 mm outside diameter the fatigue load limit Cur is 24.5 kN, the limiting speed 4,850 r/min and the thermal reference speed 3,100 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 0.98 kN/mm and per millimetre of width 3.19 kN/mm — the reason 26 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 743 g, just 0.25 g per mm² of projected 115×26 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 85 mm bore this is a heavy-industrial bearing: 743 g of stiff ring and roller set, specified where rigidity matters more than speed The 15.0 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel This is the choice for OEM production on soft shafts: machine the 85 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway 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 4,850 r/min limit. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 115 mm outside diameter and 83 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 85 mm seat, and in hydraulic and pneumatic pump eccentrics the 743 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 26 mm width and the published 137 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.
• Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.
• Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.