NK45-20-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 NK45-20-TV-XL model number is decoded

envelope 45×55×20 mm: 45 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 35 kN and C0 62 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 55 mm outside diameter the fatigue load limit Cur is 11 kN, the limiting speed 10,200 r/min and the thermal reference speed 5,900 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 0.78 kN/mm and per millimetre of width 1.75 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 85.3 g, just 0.08 g per mm² of projected 55×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 45 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 20 mm width as a standard mounting space The hardness requirement is unforgiving: below about 58 HRC the 45 mm journal brinels under the 62 kN static rating, and roughness above raceway finish accelerates roller wear With Cur 11 kN and a 10,200 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins X-life status (-XL) indicates the current Schaeffler premium execution at 45 mm bore; the 62 kN C0 rating reflects the improved rolling-contact geometry. -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 hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 55 mm outside diameter and 35 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 45 mm seat, and in copying and printing machine mechanisms the 85.3 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 20 mm width and the published 62 kN static rating. 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. 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

• 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.
• On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.
• Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.