NKI30-30-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 NKI30-30-TV-XL model number is decoded

envelope 30×45×30 mm: 30 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 46 kN and C0 81 kN at the 30 mm seat; the C/C0 ratio of 0.57 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 45 mm outside diameter the fatigue load limit Cur is 15.3 kN, the limiting speed 12,900 r/min and the thermal reference speed 6,600 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 1.53 kN/mm and per millimetre of width 1.53 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 165 g, just 0.12 g per mm² of projected 45×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 30 mm bore the 30 mm width and 46 kN C rating suit high-cycle industrial machinery rather than instrument duty This is the choice for OEM production on soft shafts: machine the 30 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway The integral inner ring brings the bore to 30 mm inside the 45×30 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing X-life status (-XL) indicates the current Schaeffler premium execution at 30 mm bore; the 81 kN C0 rating reflects the improved rolling-contact geometry. Reading -TV: an injection-moulded polyamide cage guides the rolling elements — the lightweight choice that keeps the mass at 165 g in the 45 mm envelope. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 45 mm outside diameter and 46 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 30 mm seat, and in planetary gear bearings the 165 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 30 mm width and the published 81 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.

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.
• Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.
• Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.