NA4864-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 NA4864-XL model number is decoded

envelope 320×400×80 mm: 320 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 40.0 mm radial section packed with small-diameter needle rollers C is 710 kN and C0 1850 kN at the 320 mm seat; the C/C0 ratio of 0.38 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 400 mm outside diameter the fatigue load limit Cur is 246 kN, the limiting speed 1,340 r/min and the thermal reference speed 670 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 2.22 kN/mm and per millimetre of width 8.88 kN/mm — the reason 80 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 23 kg (23000 g), just 0.72 g per mm² of projected 400×80 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 320 mm bore this is among the largest catalogue sizes; the 1,340 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 1850 kN C0 rating still assumes full rigid support under both rings The integral inner ring brings the bore to 320 mm inside the 400×80 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 246 kN Cur value. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 400 mm outside diameter and 710 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 320 mm seat, and in connecting-rod small ends the 23 kg mass is part of the rotor inertia calculation. Designers also specify it for two-stroke and compressor piston pins, relying on the 80 mm width and the published 1850 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. 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

• Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.
• On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.
• Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.