RNA6910-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 RNA6910-ZW-XL model number is decoded

envelope 58×72×40 mm: 58 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 7.0 mm radial section packed with small-diameter needle rollers C is 82 kN and C0 139 kN at the 58 mm seat; the C/C0 ratio of 0.59 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 72 mm outside diameter the fatigue load limit Cur is 23.8 kN, the limiting speed 7,800 r/min and the thermal reference speed 4,400 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 1.41 kN/mm and per millimetre of width 2.05 kN/mm — the reason 40 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 310 g, just 0.11 g per mm² of projected 72×40 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 58 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 40 mm width as a standard mounting space The thin 7.0 mm section makes the 310 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting Omitting the inner ring frees radial space — at a 58 mm shaft the outer diameter is only 72 mm and the width 40 mm, yet C is 82 kN 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 7,800 r/min limit. -ZW marks the double-row execution — two offset needle rows in one 58×72 mm ring pair, giving the 82 kN C rating in a housing space sized for a wide single bearing. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 72 mm outside diameter and 82 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 58 mm seat, and in gearbox selector and change linkages the 310 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 40 mm width and the published 139 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. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.

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.
• Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.
• 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.