RNAO50X65X40-ZW-ASR1-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 RNAO50X65X40-ZW-ASR1-XL model number is decoded

envelope 50×65×40 mm: 50 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 69 kN and C0 124 kN at the 50 mm seat; the C/C0 ratio of 0.56 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 65 mm outside diameter the fatigue load limit Cur is 22.1 kN, the limiting speed 9,100 r/min and the thermal reference speed 5,600 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 1.38 kN/mm and per millimetre of width 1.73 kN/mm — the reason 40 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 355 g, just 0.14 g per mm² of projected 65×40 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 50 mm bore marks the medium range: mounting forces and fits become critical, and the 355 g mass calls for proper induction or press tooling rather than hand fitting Cur 22.1 kN and speeds up to 9,100 r/min suit planetary gears, connecting rods and pump eccentrics where space is dictated by the shaft diameter RNAO marks the flangeless needle bearing without inner ring: neither race carries ribs, so the 50 mm hardened shaft journal and the housing faces provide all axial guidance 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 9,100 r/min limit. -ZW marks the double-row execution — two offset needle rows in one 50×65 mm ring pair, giving the 69 kN C rating in a housing space sized for a wide single bearing. -ASR1 leaves the envelope unchanged but requires a registering groove or port in the housing bore around the 50 mm seat. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 65 mm outside diameter and 69 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 50 mm seat, and in agricultural machine pivots and linkages the 355 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for connecting-rod small ends, relying on the 40 mm width and the published 124 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. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.

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.
• Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.
• Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.