NAO35X55X20-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 NAO35X55X20-XL model number is decoded

envelope 35×55×20 mm: 35 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 37 kN and C0 57 kN at the 35 mm seat; the C/C0 ratio of 0.65 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 9.1 kN, the limiting speed 11,300 r/min and the thermal reference speed 6,200 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 1.06 kN/mm and per millimetre of width 1.85 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 190 g, just 0.17 g per mm² of projected 55×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 35 mm bore marks the medium range: mounting forces and fits become critical, and the 190 g mass calls for proper induction or press tooling rather than hand fitting With the inner ring fitted the shaft seat stays at normal bearing-shaft tolerance; C0 is 57 kN and Cur 9.1 kN for the 190 g unit NAO marks the flangeless needle bearing with an inner ring: the separable ribless races accept pure radial load while adjacent parts handle axial location, and the shaft needs no hardening The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 35×55×20 mm envelope. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 55 mm outside diameter and 37 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 35 mm seat, and in small electric motor accessory drives the 190 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for gearbox selector and change linkages, relying on the 20 mm width and the published 57 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. 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

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