NA4900-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 NA4900-XL model number is decoded

envelope 10×22×13 mm: 10 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 9.6 kN and C0 9.2 kN at the 10 mm seat; the C/C0 ratio of 1.04 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 22 mm outside diameter the fatigue load limit Cur is 1.66 kN, the limiting speed 24,600 r/min and the thermal reference speed 16,400 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 0.96 kN/mm and per millimetre of width 0.74 kN/mm — the reason 13 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 23 g, just 0.08 g per mm² of projected 22×13 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 10 mm bore and only 23 g: the smallest sizes demand accurate shaft geometry, because the 6.0 mm section leaves no tolerance for a soft or tapered seat Reading the NA49 prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 9.6 kN C The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 9.2 kN C0 rating still assumes full rigid support under both rings 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 10×22×13 mm envelope. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 22 mm outside diameter and 9.6 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 10 mm seat, and in two-stroke and compressor piston pins the 23 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 13 mm width and the published 9.2 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. 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

• Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.
• Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.
• On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.