NKI60-25-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 NKI60-25-XL model number is decoded

envelope 60×82×25 mm: 60 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 11.0 mm radial section packed with small-diameter needle rollers C is 49.5 kN and C0 89 kN at the 60 mm seat; the C/C0 ratio of 0.56 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 82 mm outside diameter the fatigue load limit Cur is 15.5 kN, the limiting speed 6,800 r/min and the thermal reference speed 4,200 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 0.82 kN/mm and per millimetre of width 1.98 kN/mm — the reason 25 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 394 g, just 0.19 g per mm² of projected 82×25 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 60 mm bore places this bearing in the medium band, where the 82 mm envelope already carries ratings in the tens of kilonewtons The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 89 kN C0 rating still assumes full rigid support under both rings The 11.0 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 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 60×82×25 mm envelope. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 82 mm outside diameter and 49.5 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 60 mm seat, and in motorcycle and light-vehicle transmissions the 394 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 25 mm width and the published 89 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.
• 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.