NA4860-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 NA4860-XL model number is decoded

envelope 300×380×80 mm: 300 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 700 kN and C0 1770 kN at the 300 mm seat; the C/C0 ratio of 0.40 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 380 mm outside diameter the fatigue load limit Cur is 239 kN, the limiting speed 1,420 r/min and the thermal reference speed 720 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 2.33 kN/mm and per millimetre of width 8.75 kN/mm — the reason 80 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 21.8 kg (21800 g), just 0.72 g per mm² of projected 380×80 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 300 mm bore this is among the largest catalogue sizes; the 1,420 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 1770 kN C0 rating still assumes full rigid support under both rings Reading the NA48 prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 700 kN C 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 1,420 r/min limit. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 380 mm outside diameter and 700 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 300 mm seat, and in two-stroke and compressor piston pins the 21.8 kg mass is part of the rotor inertia calculation. Designers also specify it for small electric motor accessory drives, relying on the 80 mm width and the published 1770 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.
• Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.
• Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.