NA4876-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 NA4876-XL model number is decoded

envelope 380×480×100 mm: 380 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 50.0 mm radial section packed with small-diameter needle rollers C is 1130 kN and C0 2900 kN at the 380 mm seat; the C/C0 ratio of 0.39 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 480 mm outside diameter the fatigue load limit Cur is 375 kN, the limiting speed 1,130 r/min and the thermal reference speed 510 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 2.97 kN/mm and per millimetre of width 11.30 kN/mm — the reason 100 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 42.6 kg (42600 g), just 0.89 g per mm² of projected 480×100 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 380 mm bore puts this execution at the top of the HR1 range — the 480 mm outside diameter, 100 mm width and 42.6 kg mass are built for primary-industry load cases The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 2900 kN C0 rating still assumes full rigid support under both rings Cur 375 kN, limiting speed 1,130 r/min, reference speed 510 r/min — the inner ring adds a few grams (total 42600 g) but removes the hardening requirement -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 1130 kN C rating and longer nominal life come without an envelope change. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 480 mm outside diameter and 1130 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 380 mm seat, and in textile machine heald and cam shafts the 42.6 kg mass is part of the rotor inertia calculation. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 100 mm width and the published 2900 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. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.

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.
• On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.
• 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.