NA4906-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 NA4906-XL model number is decoded

envelope 30×47×17 mm: 30 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 28.5 kN and C0 35.5 kN at the 30 mm seat; the C/C0 ratio of 0.80 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 47 mm outside diameter the fatigue load limit Cur is 6.6 kN, the limiting speed 12,600 r/min and the thermal reference speed 6,600 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 0.95 kN/mm and per millimetre of width 1.68 kN/mm — the reason 17 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 101 g, just 0.13 g per mm² of projected 47×17 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 30 mm bore this size balances the 47 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range This is the choice for OEM production on soft shafts: machine the 30 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway Reading the NA49 prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 28.5 kN C X-life status (-XL) indicates the current Schaeffler premium execution at 30 mm bore; the 35.5 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 47 mm outside diameter and 28.5 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 30 mm seat, and in planetary gear bearings the 101 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 17 mm width and the published 35.5 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.
• Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.