NA4926-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 NA4926-XL model number is decoded

envelope 130×180×50 mm: 130 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 25.0 mm radial section packed with small-diameter needle rollers C is 229 kN and C0 470 kN at the 130 mm seat; the C/C0 ratio of 0.49 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 180 mm outside diameter the fatigue load limit Cur is 76 kN, the limiting speed 3,100 r/min and the thermal reference speed 2,000 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 1.76 kN/mm and per millimetre of width 4.58 kN/mm — the reason 50 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 3.9 kg (3900 g), just 0.43 g per mm² of projected 180×50 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 130 mm bore this is among the largest catalogue sizes; the 3,100 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position The integral inner ring brings the bore to 130 mm inside the 180×50 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing Cur 76 kN, limiting speed 3,100 r/min, reference speed 2,000 r/min — the inner ring adds a few grams (total 3900 g) but removes the hardening requirement As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 76 kN Cur value. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 180 mm outside diameter and 229 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 130 mm seat, and in connecting-rod small ends the 3.9 kg mass is part of the rotor inertia calculation. Designers also specify it for two-stroke and compressor piston pins, relying on the 50 mm width and the published 470 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. 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

• Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.
• 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.