RNA6915-ZW-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 RNA6915-ZW-XL model number is decoded

envelope 85×105×54 mm: 85 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 147 kN and C0 275 kN at the 85 mm seat; the C/C0 ratio of 0.53 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 105 mm outside diameter the fatigue load limit Cur is 50 kN, the limiting speed 5,400 r/min and the thermal reference speed 3,250 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 1.73 kN/mm and per millimetre of width 2.72 kN/mm — the reason 54 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 935 g, just 0.16 g per mm² of projected 105×54 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 85 mm bore the 105 mm outside diameter and 54 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 5,400 r/min Omitting the inner ring frees radial space — at a 85 mm shaft the outer diameter is only 105 mm and the width 54 mm, yet C is 147 kN With Cur 50 kN and a 5,400 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins 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 85×105×54 mm envelope. Reading -ZW: two needle rows instead of one; the load is spread over the 54 mm width while the outside diameter stays a compact 105 mm. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 105 mm outside diameter and 147 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 85 mm seat, and in planetary gear bearings the 935 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 54 mm width and the published 275 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. 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

• Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.
• Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.
• 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.