NAO20X35X17-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 NAO20X35X17-XL model number is decoded

envelope 20×35×17 mm: 20 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 16.8 kN and C0 26 kN at the 20 mm seat; the C/C0 ratio of 0.65 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 35 mm outside diameter the fatigue load limit Cur is 4.3 kN, the limiting speed 18,100 r/min and the thermal reference speed 10,000 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 0.84 kN/mm and per millimetre of width 0.99 kN/mm — the reason 17 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 76 g, just 0.13 g per mm² of projected 35×17 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 20 mm bore the 17 mm width and 16.8 kN C rating suit high-cycle industrial machinery rather than instrument duty Because neither ring guides axially, housing and shaft shoulders position the races; uncontrolled end float lets the rollers run off the raceway edges Flangeless NAO bearings tolerate ring displacement during mounting but not misalignment in operation — the 7.5 mm section is too thin to compensate for tilted seats X-life status (-XL) indicates the current Schaeffler premium execution at 20 mm bore; the 26 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 35 mm outside diameter and 16.8 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 20 mm seat, and in copying and printing machine mechanisms the 76 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 17 mm width and the published 26 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. 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.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.
• 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.
• Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.