NA4920-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 NA4920-XL model number is decoded

envelope 100×140×40 mm: 100 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 20.0 mm radial section packed with small-diameter needle rollers C is 144 kN and C0 270 kN at the 100 mm seat; the C/C0 ratio of 0.53 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 140 mm outside diameter the fatigue load limit Cur is 46 kN, the limiting speed 4,000 r/min and the thermal reference speed 2,550 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 1.44 kN/mm and per millimetre of width 3.60 kN/mm — the reason 40 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.9 kg (1900 g), just 0.34 g per mm² of projected 140×40 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 100 mm bore this is a heavy-industrial bearing: 1.9 kg of stiff ring and roller set, specified where rigidity matters more than speed The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 270 kN C0 rating still assumes full rigid support under both rings The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 4,000 r/min limit. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 140 mm outside diameter and 144 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 100 mm seat, and in hydraulic and pneumatic pump eccentrics the 1.9 kg mass is part of the rotor inertia calculation. Designers also specify it for textile machine heald and cam shafts, relying on the 40 mm width and the published 270 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. 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

• Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.
• 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.