NA6911-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 NA6911-ZW-XL model number is decoded

envelope 55×80×45 mm: 55 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 12.5 mm radial section packed with small-diameter needle rollers C is 102 kN and C0 176 kN at the 55 mm seat; the C/C0 ratio of 0.58 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 80 mm outside diameter the fatigue load limit Cur is 30.5 kN, the limiting speed 7,200 r/min and the thermal reference speed 4,000 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 1.85 kN/mm and per millimetre of width 2.27 kN/mm — the reason 45 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 780 g, just 0.22 g per mm² of projected 80×45 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 55 mm bore places this bearing in the medium band, where the 80 mm envelope already carries ratings in the tens of kilonewtons Reading the NA69 prefix: machined-ring needle bearing with inner ring, two roller rows, capable of pure radial load at 102 kN C This is the choice for OEM production on soft shafts: machine the 55 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway 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 55×80×45 mm envelope. Reading -ZW: two needle rows instead of one; the load is spread over the 45 mm width while the outside diameter stays a compact 80 mm. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 80 mm outside diameter and 102 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 55 mm seat, and in motorcycle and light-vehicle transmissions the 780 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 45 mm width and the published 176 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. 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

• Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.
• Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.
• Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.