RNAO60X78X40-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 RNAO60X78X40-ZW-ASR1-XL model number is decoded

envelope 60×78×40 mm: 60 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 9.0 mm radial section packed with small-diameter needle rollers C is 85 kN and C0 171 kN at the 60 mm seat; the C/C0 ratio of 0.50 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 78 mm outside diameter the fatigue load limit Cur is 28 kN, the limiting speed 7,700 r/min and the thermal reference speed 4,650 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 1.42 kN/mm and per millimetre of width 2.13 kN/mm — the reason 40 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 435 g, just 0.14 g per mm² of projected 78×40 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 60 mm bore marks the medium range: mounting forces and fits become critical, and the 435 g mass calls for proper induction or press tooling rather than hand fitting The shaft itself is the inner raceway: harden to 58–64 HRC and finish-grind to the catalogue journal tolerance, or the 171 kN static rating cannot be used At 435 g the assembly is easy to drop into a connecting-rod eye, but without ribs even a small axial offset skews the needles — end float must be controlled by the surrounding parts 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 60×78×40 mm envelope. Reading -ZW: two needle rows instead of one; the load is spread over the 40 mm width while the outside diameter stays a compact 78 mm. The -ASR1 suffix provides an annular groove with lubrication holes in the outer ring, fed directly from the housing side. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 78 mm outside diameter and 85 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 60 mm seat, and in hydraulic and pneumatic pump eccentrics the 435 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 40 mm width and the published 171 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. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.

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.
• Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.
• 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.