NKI28-20-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 NKI28-20-TV-XL model number is decoded

envelope 28×42×20 mm: 28 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 7.0 mm radial section packed with small-diameter needle rollers C is 29.5 kN and C0 44.5 kN at the 28 mm seat; the C/C0 ratio of 0.66 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 42 mm outside diameter the fatigue load limit Cur is 8 kN, the limiting speed 14,000 r/min and the thermal reference speed 7,500 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 1.05 kN/mm and per millimetre of width 1.48 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 92.4 g, just 0.11 g per mm² of projected 42×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 28 mm bore the 20 mm width and 29.5 kN C rating suit high-cycle industrial machinery rather than instrument duty The integral inner ring brings the bore to 28 mm inside the 42×20 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing NKI28/20-TV-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 8 kN Cur value. -TV denotes the PA66 cage: light, quiet and self-lubricating in dry-running moments, but limited by the polymer's continuous-temperature ceiling well below the ring steel's. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 42 mm outside diameter and 29.5 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 28 mm seat, and in hydraulic and pneumatic pump eccentrics the 92.4 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 20 mm width and the published 44.5 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. 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

• On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.
• Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.
• Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.