NA4830-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 NA4830-XL model number is decoded

envelope 150×190×40 mm: 150 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 20.0 mm radial section packed with small-diameter needle rollers C is 172 kN and C0 400 kN at the 150 mm seat; the C/C0 ratio of 0.43 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 190 mm outside diameter the fatigue load limit Cur is 63 kN, the limiting speed 2,850 r/min and the thermal reference speed 1,780 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 1.15 kN/mm and per millimetre of width 4.30 kN/mm — the reason 40 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 2.72 kg (2720 g), just 0.36 g per mm² of projected 190×40 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 150 mm bore this is among the largest catalogue sizes; the 2,850 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 150 mm inside the 190×40 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing Reading the NA48 prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 172 kN C -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 172 kN C rating and longer nominal life come without an envelope change. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 190 mm outside diameter and 172 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 150 mm seat, and in two-stroke and compressor piston pins the 2.72 kg mass is part of the rotor inertia calculation. Designers also specify it for small electric motor accessory drives, relying on the 40 mm width and the published 400 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. 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

• Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.
• Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.
• Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.