NKI45-25-TV-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 NKI45-25-TV-XL model number is decoded

envelope 45×62×25 mm: 45 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 48.5 kN and C0 87 kN at the 45 mm seat; the C/C0 ratio of 0.56 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 62 mm outside diameter the fatigue load limit Cur is 15 kN, the limiting speed 9,200 r/min and the thermal reference speed 5,100 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 1.08 kN/mm and per millimetre of width 1.94 kN/mm — the reason 25 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 217 g, just 0.14 g per mm² of projected 62×25 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 45 mm bore places this bearing in the medium band, where the 62 mm envelope already carries ratings in the tens of kilonewtons The integral inner ring brings the bore to 45 mm inside the 62×25 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing The 8.5 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 X-life status (-XL) indicates the current Schaeffler premium execution at 45 mm bore; the 87 kN C0 rating reflects the improved rolling-contact geometry. The -TV cage is part of the speed story here: cage-guided kinematics permit the published 9,200 r/min limiting speed without roller-to-roller sliding. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 62 mm outside diameter and 48.5 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 45 mm seat, and in gearbox selector and change linkages the 217 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 25 mm width and the published 87 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.
• Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.
• 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.