NA4836-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 NA4836-XL model number is decoded

envelope 180×225×45 mm: 180 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 22.5 mm radial section packed with small-diameter needle rollers C is 219 kN and C0 550 kN at the 180 mm seat; the C/C0 ratio of 0.40 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 225 mm outside diameter the fatigue load limit Cur is 81 kN, the limiting speed 2,420 r/min and the thermal reference speed 1,490 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 1.22 kN/mm and per millimetre of width 4.87 kN/mm — the reason 45 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 4.2 kg (4200 g), just 0.41 g per mm² of projected 225×45 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 180 mm bore puts this execution at the top of the HR1 range — the 225 mm outside diameter, 45 mm width and 4.2 kg mass are built for primary-industry load cases Cur 81 kN, limiting speed 2,420 r/min, reference speed 1,490 r/min — the inner ring adds a few grams (total 4200 g) but removes the hardening requirement The integral inner ring brings the bore to 180 mm inside the 225×45 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing 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 2,420 r/min limit. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 225 mm outside diameter and 219 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 180 mm seat, and in planetary gear bearings the 4.2 kg mass is part of the rotor inertia calculation. Designers also specify it for copying and printing machine mechanisms, relying on the 45 mm width and the published 550 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. 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.

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